MIL-DTL-28840D.pdf

PDF 991 KB Posted Aug 26, 2020

Attached to: CONNECTOR, BACKSHELL AND PROTECTIVE CAP PURCHASE
Solicitation number: N6449820R4076
Issued by: Department of the Navy Naval Sea Systems Command

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AMSC N/A FSC 5935

DETAIL SPECIFICATION

CONNECTORS, ELECTRICAL, CIRCULAR, THREADED, HIGH SHOCK,

HIGH DENSITY, SHIPBOARD, CLASS D, GENERAL SPECIFICATION FOR

This specification is approved for use by all Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers circular electrical connectors with removable crimp type, front release contacts. These connectors are for use with jacketed cables in shipboard applications.

1.1.1 Temperature. These connectors are rated for specified operation within a temperature range of -55º C (-67º F) to 200º C (392º F). The upper temperature is the maximum internal hot-spot temperature resulting from any combination of electrical load and ambient conditions.

1.1.1.1 Insulation resistance. Insulation resistance limits vary with temperature (see figure 1).

1.1.1.2 Service life. Service life varies with temperature (see figure 2 and table I).

1.2 Classification.

1.2.1 Part or Identifying Number (PIN). The connector PIN for qualified connectors procured in accordance with this specification is the letter “M”, the basic number of the applicable specification sheet and the applicable alphanumeric characters formulated as in the following examples:

M28840/XX X X X X X X

Basic PIN (see 1.2.1)

Class code (see 1.2.1.1)

Shell size designator (see 1.2.1.2)

Insert arrangement designator (see 1.2.1.3)

Backshell size designator (see 1.2.1.4)

Contact style (see 1.2.1.5)

Key position (see 1.2.1.6)

MIL-DTL-28840D

w/AMENDMENT 1 18 July 2017

SUPERSEDING

MIL-DTL-28840D

7 November 2013

INCH-POUND

Comments, suggestions, or questions on this document should be addressed to DLA Land and Maritime- VAI, P.O. Box 3990, Columbus OH 43218-3990 or emailed to CircularConnector@dla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https://assist.dla.mil.

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1.2.1.1 Class code. The class of the connector is as specified in table I.

TABLE I. Connector classes – physical characteristics.

Class code

Class

Feature

Hot spot temperature (°C)

Service life

Insert sealing material

Shell and coupling rings

Fluid resistance Material Finish

A D High impact shock

200 1/

20 yrs.

hrs.

Fluorosilicone

Wrought aluminum

Cadmium olive drab over nickel

Complete

B DS High impact shock

Corrosion resistant steel 316

Cadmium black

C DJ

High impact shock with backshell connector assembly

Wrought aluminum

Cadmium olive drab over nickel

E DJS

Corrosion resistant steel 316

Cadmium black

N TS High impact shock

Stainless steel

Nickel-fluorocarbon polymer non-reflective V TJS High impact shock with backshell connector assembly

R ZS High impact shock

Zinc nickel black non-reflective

X ZJS

High impact shock with backshell connector assembly

F P High impact shock

Wrought aluminum

Pure electro deposited aluminum non-reflective

G PJ

High impact shock with backshell connector assembly

L T High impact Shock

Nickel-fluorocarbon polymer non-reflective

M TJ

High impact shock with backshell connector assembly

S Z High impact shock Zinc nickel black non-reflective U ZJ High impact shock with backshell connector assembly

1/ Hot spot test requirement for inserts and seals is 200°C.

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1.2.1.2 Shell sizes. The shell size is as specified in table II.

TABLE II. Shell sizes.

Designator A B C D E F G H J Shell sizes 11 13 15 17 19 23 25 29 33

1.2.1.3 Insert arrangement. The insert arrangement designator is a single digit indicating the insert pattern in accordance with the applicable insert arrangement in accordance with MIL-STD-1698.

1.2.1.4 Backshell size designator. The backshell size designator, identified by the letter A, B, C, or D, will be in accordance with the applicable specification sheets.

1.2.1.5 Contact styles. The following designators identify the various contact styles.

a. Connectors ordered with standard contacts in accordance with MIL-STD-1698.

P - Pin contacts -20-22 (see SAE-AS39029/83-450) S - Socket contacts -20-22 (see SAE-AS39029/84-452) D - Pin contacts -20-28 (see SAE-AS39029/83-451) E - Socket contacts -20-28 (see SAE-AS39029/84-453) F - Pin contacts -20-20 (see SAE-AS39029/83-508) G - Socket contacts -20-20 (see SAE-AS39029/84-509)

The P, S, D, E, F, and G designators indicate that the connectors will be used with full complements of the applicable standard contacts in accordance with MIL-STD-1698. The connectors that accommodate crimp removable contacts ( P, S, D, E, F, or G) may be ordered without standard contacts by adding an appropriate note on the purchase order. The connector PIN and the marking requirements remain unchanged.

b. Connectors used with other than standard contacts in accordance with MIL-STD-1698.

A - Less pin contacts B - Less socket contacts

The A or B designators indicate that the connectors will be used with other than standard contacts in accordance with MIL-STD-1698 (example: shielded, coaxial, thermocouple, fiber optic contacts). The A or B designators are part of the connector PIN and are marked on the connector. The connector will be supplied without contacts. The contacts that will be used with the connectors should be ordered separately (see 3.4.1.1.1 and 6.2).

NOTE: When A and B designators are used, the requirements stated herein may not be met.

1.2.1.6 Key position. The key or keyway position is identified by the appropriate number 1, 2, 3, 4, 5 or 6 as specified on figure 3.

1.2.2 Coupling. Connectors have a threaded coupling as specified on figures 8 and 9.

1.2.3 Receptacle mounting. Receptacle mounting is designed as either flange or jam nut.

1.3 Wire range accommodations. The wire ranges as specified in table III are accommodated by the contacts as indicated.

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FIGURE 1. Minimum insulation resistance vs. hot spot temperature.

FIGURE 2. Service life vs. hot spot temperature.

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TABLE III. Wire range accommodations. 1/ 2/

Contact size

Wire size

Outside diameter (OD) of finished wire (inch) 3/ 4/

Minimum Maximum

20-20

.040 (1.02)

.070 (1.78)

20-22

20-28

1/ Dimensions are in inches.

2/ Metric equivalents (in millimeters) are given for information only.

3/ To obtain sealing, wires must be built up to finished wire diameter (see 6.1.1).

4/ In accordance with MIL-DTL-24643 and MIL-DTL-16878.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL STANDARD

FED-STD-H28 - Screw-Thread Standards for Federal Services.

(Copies of these documents are available online at http://quicksearch.dla.mil.)

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DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-S-901 - Shock Tests, H.I. (High-Impact), Shipboard Machinery, Equipment and Systems, Requirements for.

MIL-DTL-16878 - Wire, Electrical, Insulated, General Specification for.

MIL-DTL-24643 - Cables, Electric, Low Smoke Halogen-Free, for Shipboard Use, General Specification for.

MIL-I-81969/3 - Installing and Removal Tools, Connector, Electrical Contact, Type II, Class 1, Composition A.

MIL-I-81969/33 - Installing and Removal Tools, Connector, Electrical Contact, Type I, Class 1, Composition A.

MIL-DTL-83488 - Coating, Aluminum, High Purity.

MS3186 - Connector, Mounting to Connectors, Mounting Nuts, Plain Hexagon.

MS27488 - Plug, End Seal, Electrical Connector.

(See supplement 1 for list of specification sheets.)

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment

(Type I - Environmental and Type II - Internally Excited).

MIL-STD-202-107 - Method 107, Thermal Shock MIL-STD-790 - Established Reliability and High Reliability Qualified Products List

(QPL) Systems for Electrical, Electronic, and Fiber Optic Parts Specifications.

MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests.

MIL-STD-889 - Dissimilar Metals.

MIL-STD-1285 - Marking of Electrical and Electronic Parts.

MIL-STD-1373 - Screw-Thread, Modified, 60 Degree Stub, Double.

MIL-STD-1698 - Insert Arrangements for MIL-DTL-28840 High Density, High Shock

Circular Connectors.

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AEROSPACE INDUSTRIES ASSOCIATION (AIA)

NASM20995 - Wire, Safety or Lock.

(Copies of these documents are available online at http://www.aia-aerospace.com.)

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ASTM INTERNATIONAL

ASTM A276 - Steel Bars and Shapes, Stainless.

ASTM A342/A342M - Materials, Feebly Magnetic, Permeability of, Standard Test Methods for.

ASTM A473 - Steel Forgings, Stainless.

ASTM A580/A580M - Steel Wire, Stainless.

ASTM B841 - Electrodeposited Coatings of Zinc Nickel Alloy Deposits.

(Copies of these documents are available at http://www.astm.org.)

ELECTRONIC COMPONENTS INDUSTRY ASSOCIATION (ECIA)

EIA-364 - Electrical Connector/Socket Test Procedures including

Environmental Classifications.

EIA-364-09 - Durability Test Procedure for Electrical Connectors and Contacts.

EIA-364-20 - Withstanding Voltage Test Procedure for Electrical Connectors, Sockets and Coaxial Contacts.

EIA-364-28 - Vibration Test Procedure for Electrical Connectors and Sockets.

EIA-364-31 - Humidity Test Procedure for Electrical Connectors and Sockets.

EIA-364-35 - Insert Retention Test Procedure for Electrical Connectors.

EIA-364-42 - Impact Test Procedure for Electrical Connectors.

EIA/ECA-364-21 - Insulation Resistance Test Procedure for Electrical Connectors, Sockets and Coaxial Contacts.

EIA/ECA-364-26 - Salt Spray Test Procedure for Electrical Connectors, Contacts and

Sockets.

(Copies of these documents are available online at http://eciaonline.org.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 17025 - General Requirements for the Competence of Testing and Calibration Laboratories.

(Copies of these documents are available online at www.ansi.org.)

NCSL INTERNATIONAL

NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment.

(Copies of these documents are available online at http://www.ncsli.org.)

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SAE INTERNATIONAL

SAE-AMS-QQ-P-416 - Plating, Cadmium (Electrodeposited).

SAE-AMS2454 - Plating, Electroless Nickel, Codeposited with

Polytetrafluoroethylene (PTFE).

SAE-EIA-557 - Statistical Process Control Systems.

SAE-AS22520 - Crimping Tools, Wire Termination, General Specification for.

SAE-AS39029 - Contacts, Electrical Connector, General Specification for.

SAE-AS39029/83 - Contacts, Electrical Connector, Pin, Crimp Removable

(for MIL-DTL-28840 Connectors).

SAE-AS39029/84 - Contact, Electrical Connector, Socket, Crimp Removable (for

MIL-DTL-28840 Connectors).

(Copies of these documents are available at http://www.sae.org.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of conflict between the requirements of this specification and the specification sheet, the latter shall govern.

3.2 Qualification. The connectors and accessories furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (See 4.3 and 6.3).

3.2.1 Quality.

3.2.1.1 Statistical process control (SPC). The contractor shall implement and use SPC techniques in the manufacturing process for parts covered by this specification. The SPC program shall be developed and maintained in accordance with SAE-EIA-557. The SPC program shall be documented and maintained as part of the overall reliability assurance program as specified in MIL-STD-790.

3.3 Materials. Materials shall be suitable for the purpose intended, and where required herein, shall be as specifically described.

3.3.1 Dissimilar metals and compatible couples. When dissimilar metals are used in intimate contact with each other, protection against galvanic corrosion shall be provided. The use of dissimilar metals in contact, which tend toward active galvanic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy) is not acceptable. However, metal plating of dissimilar base metals to provide similar or suitable abutting surfaces is permitted. The use of dissimilar metals separated by a suitable insulating material is also permitted. Dissimilar metals and compatible couples are specified in MIL-STD-889.

3.3.2 Nonmagnetic materials. All parts shall be made of materials considered to be nonmagnetic (see 3.6).

3.3.3 Contact materials. Contacts shall be made of suitable conductive copper-based alloy in accordance with SAE-AS39029.

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3.3.4 Dielectric materials.

3.3.4.1 Inserts. Inserts shall be solid dielectric and shall have the hardness, electrical, and mechanical characteristics suitable for the purpose intended.

3.3.4.1.1 Resilient materials. Resilient materials shall be silicone or fluorosilicone and have the Shore A durometer specified as follows:

Pin insert face 70 ± 5 Socket insert face 70 ± 5

Gaskets 40 ± 5 Grommets 50 ± 5 O-rings 60 ± 5 Wire separator 70 ± 5

3.3.4.1.2 Connectors. The mating faces of inserts shall be resilient material with a Shore A durometer as specified in 3.3.4.1.1 with a total (pin and socket insert face) minimum thickness of .090 inch.

3.3.5 Shells and coupling rings. Shells and coupling rings shall consist of the following materials as specified herein (see 1.2.1.1):

a. Heat-treated wrought aluminum alloy meeting the performance requirements of this specification.

b. Non-magnetic corrosion-resisting steel in accordance with ASTM A276, ASTM A473, or

ASTM A580/A580M, type 316.

3.3.5.1 Finish. The resultant finish on all connectors shall be electrically conductive.

a. The finish of connectors and external screws with wrought aluminum shells and coupling rings shall be of the following:

Cadmium plate in accordance with SAE-AMS-QQ-P-416, type II, class 3 over nickel. The resultant finish on cadmium-plated connectors shall be olive drab (light to dark).

Zinc nickel - Zinc nickel alloy in accordance with ASTM B841, type D (black), over a suitable underplate. Color shall be non-reflective and shall withstand 500 hours salt spray.

Nickel fluorocarbon polymer - High phosphate nickel with fluorocarbon polymer additives conforming to SAE-AMS2454 over a suitable underplate, color – non-reflective, and shall withstand 500 hours salt spray.

Pure electrodeposited aluminum - Pure dense electrodeposited aluminum in accordance with MIL-DTL-83488, type II, color – non-reflective, and shall withstand 500 hours salt spray.

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b. The finish of connectors with corrosion-resisting steel shells and coupling rings shall be as follows:

Cadmium plate in accordance with SAE-AMS-QQ-P-416, type II, class 3, color - black.

Zinc nickel - Zinc nickel alloy in accordance with ASTM B841, type D (black), over a suitable underplate. Color shall be non-reflective and shall withstand 500 hours salt spray.

c. Spring fingers — Shell spring fingers shall be suitably protected to prevent corrosion.

d. External screws may be stainless steel in lieu of the finish specified.

3.3.6 Fungus-resistant. Materials used in the construction of these connectors shall be fungus inert (see 4.1.1).

3.3.7 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered, environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.

3.4 Design and construction. Connectors and accessories shall be designed and constructed to withstand normal handling incident to installation and maintenance in service. The connectors and accessories shall conform to the following:

Connector, position keys and keyways: Figure 3 Plug interface dimensions: Figure 4 Receptacle interface dimensions: Figure 5 Connector back-end configuration: Figure 6 Rear accessory design standard: Figure 7 Connector mating threads, internal: Figure 8 Connector mating threads, external: Figure 9

3.4.1 Contacts. Contacts shall be in accordance with SAE-AS39029. Contacts shall be designed so that neither the pin nor the socket contact shall be damaged during mating of counterpart connectors.

A quantity of crimp contacts consisting of the normal complement, plus 5 percent, but not less than two, shall be included in the unit package. For other than direct shipments to the Government, connectors may be ordered without contacts, thus allowing contacts to be purchased in bulk (see 6.2).

3.4.1.1 Contacts, retention device or sealing member. Contacts shall be designed to prevent damage to the contact retention device or sealing member during insertion and removal of the contact. Contacts shall be in accordance with SAE-AS39029/83, SAE-AS39029/84 and

SAE-AS39029.

3.4.1.1.1 Indirect shipment. Environment resisting connectors may be ordered without contacts (see 1.2.1.5 and 6.2).

3.4.1.2 Installing and removal tools. The individual contacts shall be positively retained in the connector when installed with the MIL-I-81969/33 contact installing tool. The individual contacts shall be capable of being removed from the connector when using the MIL-I-81969/34 contact removal tool.

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3.4.2 Insert design and construction. The entire insert and wire sealing or wire support member of the insert assembly shall be of one integral part, designed to provide sealing and support around the wires. The entire insert shall be nonremovable from the shell and shall be keyed, bonded, and secured so as to prevent rotation or movement within the shell. The rigid dielectric shall be one molded piece or no more than two pieces bonded to form essentially one molded piece. Inserts shall be of voidless construction, eliminating all air paths between contacts.

Inches mm Inches mm Inches mm

.005 0.13 .083 2.11 .133 3.38

.008 0.20 .090 2.29 .134 3.40

.062 1.57 .129 3.28 .138 3.50

.070 1.78

FIGURE 3. Connector, electrical, position keys and keyways, mating.

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Designator (see note 3)

Key and keyway arrangement

AR°

AP°

BSC

BR°

BP°

BSC

CR°

CP°

BSC

DR°

DP°

BSC

A (11)

B (13)

1 95 141 208 236 2 113 156 182 292 3 90 145 195 252 4 53 156 220 255 5 119 146 176 298 6 51 141 184 242

C (15)

D (17)

1 80 142 196 293 2 135 170 200 310 3 49 169 200 244

4 66 140 200 257 5 62 145 180 280 6 79 153 197 272

E (19)

F (23)

G (25)

H (29)

J (33)

1 80 142 196 293

2 135 170 200 310

3 49 169 200 244

4 66 140 200 257

5 62 145 180 280

6 79 153 197 272

FIGURE 3. Connector, electrical, position keys and keyways, mating – Continued.

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Key and keyway arrangement

dia

A (11)

B (13)

.559 (14.20) .551 (14.00)

.581 (14.76) .569 (14.45)

.683 (17.35)

.675 (17.14)

.705 (17.91) .693 (17.60)

C (15)

D (17)

.855 (21.72) .847 (21.51)

.877 (22.28) .865 (21.97)

.925 (23.50)

.917 (23.29)

.947 (24.50) .935 (23.75)

E (19)

F (23)

G (25)

H (29)

J (33)

1.092 (27.74)

1.84 (27.53)

1.114 (28.30)

1.102 (27.99)

1.277 (32.44)

1.269 (32.23)

1.299 (32.99)

1.287 (32.69)

1.438 (36.52)

1.430 (36.32)

1.460 (37.08)

1.448 (36.78)

1.604 (40.74)

1.596 (40.54)

1.626 (41.30)

1.614 (41.00)

1.796 (45.62)

1.788 (45.42)

1.818 (46.18)

1.806 (45.87)

NOTES:

1. Dimension are in inches.

2. Metric equivalents (in millimeters) are given for information only.

3. Shell sizes are provided within parentheses for information and are not a part of the designator.

4. Dimensions apply after plating.

5. For datums A and E, see figures 4 and 5, respectively.

FIGURE 3. Connector, electrical, position keys and keyways, mating – Continued.

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FIGURE 4. Connector, plug, electrical, interface dimensions.

Inches mm Inches mm

.010 0.26 .238 6.04

.020 0.52 .320 8.13

.028 0.71 .461 11.72

.035 0.89 .588 14.94

.045 1.14 .650 16.51

.068 1.73 .872 22.15

.100 2.54 .882 22.40

.110 2.79 .887 22.53

.194 4.93 .892 22.66

.208 5.28 .902 22.91

.234 5.94

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A thread class 2B

E dia

F dia

I dia

A (11) .750-.1P-.2L-DS

.502 (12.75) .492 (12.50)

.381 (9.68)

.371 (9.42) .367 (9.32) .352 (8.94)

B (13) .875-.1P-.2L-DS

.626 (15.90) .616 (15.65)

.503 (12.79) .493 (12.52)

.489 (12.42)

.474 (12.04)

C (15) 1.062-.1P-.2L-DS

.798 (20.27) .788 (20.02)

.681 (17.30)

.671 (17.04) .667 (16.91) .652 (16.56)

D (17) 1.125-.1P-.2L-DS

.868 (22.05) .858 (21.79)

.758 (19.25)

.748 (19.00) .744 (18.90) .729 (18.52)

E (19) 1.312-.1P-.2L-DS 1.035 (26.29)

1.025 (26.01)

.902 (22.91)

.892 (22.66) .888 (22.56) .873 (22.17)

F (23) 1.500-.1P-.2L-DS 1.220 (30.99)

1.210 (30.73)

1.087 (27.61)

1.377 (27.36)

1.073 (27.25)

1.058 (26.87)

G (25) 1.625-.1P-.2L-DS

1.381 (35.08)

1.371 (34.82)

1.276 (32.41)

1.266 (32.16)

1.262 (32.05)

1.247 (31.67)

H (29) 1.812-.1P-.2L-DS

1.547 (39.29)

1.537 (39.04)

1.427 (36.25)

1.417 (35.99)

1.412 (35.86)

1.397 (35.48)

J (33) 2.000-.1P-.2L-DS

1.739 (44.17)

1.729 (13.92)

1.625 (41.28)

1.615 (41.02)

1.610 (40.89)

1.595 (40.51)

1. Dimensions are in inches.

2. Metric equivalents (in millimeters) are given for information only.

3. Shell sizes are provided within parentheses for information only, and are not a part of the designator.

4. Dimensions apply after plating.

5. Mating key positions and dimensions as specified on figure 3.

6. This design information establishes connector intermating criteria and interchangeability of accessory hardware.

7. Rear end connector design for attachment of non-rotatable accessory hardware as specified on figure 6.

8. Dimensions include contact slack.

9. Distance from front of plug barrel to the point at which the gauge ring having the same nominal inside diameter as the receptacle shell first engages the spring member.

FIGURE 4. Connector, plug, electrical, interface dimensions - Continued.

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Inches mm Inches mm Inches mm Inches mm .015 0.38 .042 1.07 .194 4.93 .525 13.34 .020 0.52 .060 1.52 .234 5.94 .635 16.14 .028 0.71 .068 1.73 .445 11.31 .802 20.37 .030 0.76 .138 3.51 .450 11.43 .822 20.88 .040 1.03 .158 4.01 .515 13.08 .849

.859 21.56 21.82

FIGURE 5. Connector, receptacle, electrical, interface dimensions.

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A-thread class 2A

D dia

I dia

A (11) .750-.1P-.2L-DS .513 (13.03)

.504 (12.80)

.367 (9.32)

.352 (8.94)

B (13) .875-.1P-.2L-DS .637 (16.18)

.628 (15.95)

.489 (12.12)

.474 (12.04)

C (15) 1.062-.1P-.2L-DS .809 (20.55)

.800 (20.32)

.667 (16.91)

.652 (16.56)

D (17) 1.125-.1P-.2L-DS .579 (22.33)

.870 (22.10)

.744 (18.90)

.729 (18.52)

E (19) 1.312-.1P-.2L-DS 1.046 (26.57)

1.037 (26.34)

.883 (22.56)

.873 (22.17)

F (23) 1.500-.1P-.2L-DS 1.231 (31.27)

1.222 (31.04)

1.073 (27.25)

1.058 (26.87)

G (25) 1.625-.1P-.2L-DS 1.392 (35.36)

1.383 (35.13)

1.262 (32.95)

1.247 (31.67)

H (29) 1.812-.1P-.2L-DS 1.558 (39.57)

1.549 (39.34)

1.412 (35.86)

1.397 (35.48)

J (33) 2.000-.1P-.2L-DS 1.750 (44.45)

1.741 (44.22)

1.610 (40.89)

1.595 (40.51)

2. Metric equivalents (in millimeters) are given for information only.

3. Shell sizes are provided within parentheses for information only and are not part of the designator.

4. Dimensions apply after plating.

5. Mating keyway positions and dimensions as specified on figure 3.

6. This design information establishes connector intermating criteria and interchangeability of accessory hardware.

7. Rear end connector design for attachment of non-rotatable accessory hardware as specified on figure 6.

8. Dimensions include contact slack.

FIGURE 5. Connector, receptacle, electrical, interface dimensions - Continued.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

Inches mm .006 0.15 .145 3.68 .190 4.83 .549 13.94

FIGURE 6. Connector back-end configuration.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

Inches mm Inches mm Inches mm .004 0.10 .030 0.76 .227 5.77 .006 0.15 .040 1.02 .238 6.05 .015 0.38 .102 2.59 .025 0.64 .113 2.87

FIGURE 6. Connector back-end configuration - Continued.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

BSC

C F dia

H dia max grommet

V thread class 2A

A (11) 20° .0515 (1.31) .0465 (1.18)

.388 (9.86)

.358 (9.09) .447 (11.35)

3/4 – 20

UNEF

B (13) 20° .0615 (1.56) .0565 (1.44)

.523 (13.28)

.493 (12.52) .582 (14.78)

7/8 – 20

UNEF

C (15) 18° .0660 (1.68) .0610 (1.55)

.680 (17.27)

.650 (16.51) .727 (18.47)

1 – 20

UNEF

D (17) 15° .0630 (1.60) .0580 (1.47)

.765 (19.43)

.735 (18.67) .824 (20.93)

1 1/8 – 18

UNEF

E (19) 15° .0720 (1.83) .0670 (1.70)

.897 (22.78)

.867 (22.02) .956 (24.28)

1 1/4 – 18

UNEF

F (23) 12° .0680 (1.73) .0630 (1.60)

1.094 (27.79)

1.064 (27.02)

1.153 (29.29) 1 7/16 – 18

UNEF

G (25) 10° .0645 (1.64) .0595 (1.51)

1.261 (32.03)

1.231 (31.27)

1.322 (33.58) 1 9/16 – 18

UNEF

H (29) 9° .0680 (1.73) .0630 (1.60)

1.463 (37.16)

1.433 (36.40)

1.522 (38.66) 1 7/8 – 16

J (33) 8° .0680 (1.73) .0630 (1.60)

1.661 (42.19)

1.631 (41.43)

1.720 (43.69) 2 1/16 – 16

FIGURE 6. Connector back-end configuration – Continued.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

BSC

dia

dia max

dia

A (11) 20° .549 (13.94) .543 (13.79)

.540 (13.72)

.534 (13.56) .755 (19.18)

.573 (14.55)

.567 (14.40)

B (13) 20° .664 (16.87) .658 (16.71)

.655 (16.64)

.649 (16.48) .880 (22.35)

.688 (17.48)

.682 (17.32)

C (15) 18° .799 (20.29) .793 (20.14)

.790 (20.07)

.784 (19.91)

1.005 (25.53)

.823 (20.90)

.817 (20.75)

D (17) 15° .906 (23.01) .900 (22.86)

.897 (22.78)

.891 (22.63)

1.130 (28.70)

.930 (23.62)

.924 (23.47)

E (19) 15°

1.041 (26.44)

1.035 (26.29)

1.032 (26.21)

1.026 (26.06)

1.255 (31.88)

1.065 (27.05)

1.059 (26.90)

F (23) 12°

1.228 (31.19)

1.222 (31.04)

1.219 (30.96)

1.213 (30.81)

1.443 (36.65)

1.252 (31.80)

1.246 (31.65)

G (25) 10°

1.388 (35.26)

1.382 (35.10)

1.379 (35.03)

1.373 (34.87)

1.567 (39.80)

1.412 (35.86)

1.406 (35.71)

H (29) 9°

1.639 (41.63)

1.633 (41.48)

1.630 (41.40)

1.624 (41.25)

1.880 (47.75)

1.663 (42.24)

1.657 (42.09)

J (33) 8°

1.834 (46.58)

1.828 (46.43)

1.825 (46.36)

1.819 (46.20)

2.067 (52.50)

1.858 (47.19)

1.852 (47.04)

2. Metric equivalents (in millimeters) are given for information only.

3. Shell sizes are provided within parentheses for information only and are not part of the designator.

FIGURE 6. Connector back-end configuration - Continued.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

FIGURE 7. Connector, electrical, rear accessory design standard.

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Inches mm Inches mm

.006 0.15 .238 6.04

.015 0.38 .273 6.93

.030 0.76 .303 7.70

.040 1.02 .333 8.46

.070 1.78 .491 12.47

.080 2.03

.218 5.54

FIGURE 7. Connector, electrical, rear accessory design standard - Continued.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

A dia

B dia

C dia

A (11) .770 (19.56) .750 (19.05)

.583 (14.81)

.579 (14.71) .556 (14.12) .553 (14.05)

B (13) .895 (22.73) .875 (22.22)

.698 (17.73)

.694 (17.63) .671 (17.04) .668 (16.97)

C (15) 1.020 (25.91)

1.000 (25.40

.833 (21.16)

.829 (21.06) .806 (20.47) .803 (20.40)

D (17) 1.145 (29.08)

1.125 (28.58)

.940 (23.88)

.936 (23.77) .913 (23.19) .910 (23.11)

E (19) 1.270 (32.26)

1.250 (31.75)

1.075 (27.30)

1.071 (27.20)

1.048 (26.62)

1.045 (26.54)

F (23) 1.458 (37.03)

1.438 (36.52)

1.262 (32.05)

1.232 (31.29)

1.235 (31.37)

1.232 (31.29)

G (25) 1.582 (40.18)

1.562 (39.67)

1.422 (36.12)

1.418 (36.02)

1.395 (35.43)

1.392 (32.13)

H (29) 1.895 (48.23)

1.875 (47.62)

1.673 (43.49)

1.669 (42.39)

1.646 (41.81)

1.643 (41.73)

J (33) 2.082 (52.88)

2.062 (52.37)

1.868 (47.45)

1.864 (47.34)

1.841 (46.76)

1.838 (46.68)

D dia

BSC

A (11) .447 (11.35) .427 (10.84) 20° .0445 (1.13)

.0425 (1.08)

B (13) .582 (14.78) .562 (14.27) 20° .0545 (1.38)

.0525 (1.33)

C (15) .727 (18.47) .707 (17.96) 18° .0590 (1.50)

.0570 (1.45)

D (17) .824 (20.93) .804 (20.42) 15° .0560 (1.42)

.0540 (1.37)

E (19) .956 (24.28) .936 (23.77) 15° .0650 (1.65)

.0630 (1.60)

F (23) 1.153 (29.29)

1.133 (28.78) 12° .0610 (1.55)

.0590 (1.50)

G (25) 1.285 (32.64)

1.265 (32.13) 10° .0575 (1.46)

.0555 (1.41)

H (29) 1.522 (38.66)

1.502 (38.15) 9° .0610 (1.55)

.0590 (1.50)

J (33) 1.720 (43.69)

1.700 (43.18) 8° .0610 (1.55)

.0590 (1.50)

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E dia

M thread class 2B

P dia

A (11) .367 (9.32) .357 (9.07)

3/4 – 20

UNEF

.658 (16.71)

.652 (16.56)

B (13) .502 (12.75) .492 (12.50)

7/8 – 20

UNEF

.773 (19.63)

.767 (28.98)

C (15) .647 (16.43) .637 (16.18)

1 – 20

UNEF

.908 (23.06)

.902 (22.91)

D (17) .744 (18.90) .734 (18.64)

1 1/8 – 18

UNEF

1.015 (25.78)

1.009 (25.63)

E (19) .876 (22.25) .866 (22.00)

1 1/4 – 18

UNEF

1.150 (29.21)

1.144 (29.06)

F (23) 1.073 (27.25)

1.063 (27.00)

1 7/16 – 18

UNEF

1.337 (33.96)

1.331 (33.81)

G (25) 1.205 (30.61)

1.195 (30.35)

1 9/16 – 18

UNEF

1.473 (37.41)

1.467 (37.26)

H (29) 1.442 (36.63)

1.432 (36.37)

1 7/8 – 16

1.748 (44.40)

1.742 (44.25)

J (33) 1.640 (41.66)

1.630 (41.40)

1/16 – 16

1.943 (49.35)

1.937 (49.20)

Q dia max

R dia max

A (11) 1.028 (26.11) .588 (14.94) B (13) 1.141 (28.98) .703 (17.86) C (15) 1.263 (32.08) .838 (21.28) D (17) 1.387 (35.23) .945 (24.00) E (19) 1.513 (38.43) 1.080 (27.43) F (23) 1.703 (43.26) 1.267 (32.18) G (25) 1.825 (46.36) 1.427 (36.24) H (29) 2.143 (54.43) 1.678 (42.62) J (33) 2.329 (59.16) 1.873 (47.57)

2. Metric equivalents (in millimeters) are given for information only.

3. Shell sizes are provided within parentheses for information only and are not part of the designator.

5. The coupling nut shall be captive and free to rotate on accessory.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

Class 2B thread, 0.1 pitch, modified 60° stub internal Double thread series in accordance with MIL-STD-1373, symbol DS-2B

Designation Internal thread-limits of size

Thread size

Pitch

Lead

Minor diameter Pitch diameter Major diameter Limits

Tolerance Limits

Tolerance Limits min max min max min max

.7500 .1 .2 .7042 (17.887)

.7142 (18.141)

.0100 (0.254)

.7240 (18.390)

.7340 (18.644)

.0100 (0.254)

.7540 (19.152)

.7700 (19.558)

.8750 .1 .2 .8292 (21.062)

.8392 (21.316)

.0100 (0.254)

.8490 (21.565)

.8590 (21.819)

.0100 (0.254)

.8790 (22.327)

.8950 (22.733)

1.0625 .1 .2 1.0025 (25.464)

1.0145 (25.768)

.0120 (0.305)

1.0285 (26.124)

1.0405 (26.429)

.0120 (0.305)

1.0665 (27.089)

1.0865 (27.597)

1.1250 .1 .2 1.0650 (27.051)

1.0770 (27.356)

.0120 (0.305)

1.0910 (27.711)

1.1030 (28.016)

.0120 (0.305)

1.1290 (28.677)

1.1490 (29.185)

1.3125 .1 .2 1.2525 (31.814)

1.2645 (32.118)

.0120 (0.305)

1.2785 (32.474)

1.2905 (32.779)

.0120 (0.305)

1.3165 (33.439)

1.3365 (33.947)

1.5000 .1 .2 1.4400 (36.576)

1.4520 (36.881)

.0120 (0.305)

1.4660 (37.236)

1.4780 (37.541)

.0120 (0.305)

1.5040 (38.202)

1.5240 (38.710)

1.6250 .1 .2 1.5650 (39.751)

1.5770 (40.056)

.0120 (0.305)

1.5910 (40.411)

1.6030 (40.716)

.0120 (0.305)

1.6290 (41.377)

1.6490 (41.885)

1.8125 .1 .2 1.1525 (29.274)

1.7645 (44.818)

.0120 (0.305)

1.7785 (45.174)

1.7905 (45.479)

.0120 (0.305)

1.8165 (46.139)

1.8365 (46.647)

2.0000 .1 .2 1.9400 (49.276)

1.9520 (49.581)

.0120 (0.305)

1.9660 (49.936)

1.9780 (50.241)

.0120 (0.305)

2.0040 (50.902)

2.0240 (51.410)

1. Formulas for these values are in accordance with MIL-STD-1373.

2. For all other dimensions not shown refer to MIL-STD-1373.

3. Dimensions are in inches.

4. Metric equivalents (in millimeters) are given for information only.

FIGURE 8. Connector mating threads, internal.

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Class 2A thread, 0.1 pitch, modified 60° stub external Double thread series in accordance with MIL-STD-1373, symbol DS-2A

Destination

Allowance

External thread-limits of size

Thread size Pitch Lead

Major diameter Pitch diameter Minor diameter limits

Tolerance limits

Tolerance limits max min max min max min

.7500 .1 .2 .0015 (0.0381)

.7485 (19.012)

.7405 (18.809)

.0080 (0.203)

.7225 (18.352)

.7145 (18.148)

.0080 (0.203)

.6925 (17.590)

.6785 (17.234)

.8750 .1 .2 .0015 (0.0381)

.8735 (22.187)

.8655 (21.984)

.0080 (0.203)

.8475 (21.527)

.8395 (21.323)

.0080 (0.203)

.8175 (20.765)

.8035 (20.409)

1.0625 .1 .2 .0020 (0.0508)

1.0605 (26.937)

1.0485 (26.632)

.0120 (0.305)

1.0265 (26.073)

1.0165 (25.819)

.0120 (0.305)

.9885 (25.362)

.9705 (24.651)

1.1250 .1 .2 .0020 (0.0508)

1.1230 (28.524)

1.1110 (28.219)

.0120 (0.305)

1.0890 (27.661)

1.0790 (27.407)

.0120 (0.305)

1.0510 (26.695)

1.0330 (26.238)

1.3125 .1 .2 .0020 (0.0508)

1.3105 (33.287)

1.2985 (32.982)

.0120 (0.305)

1.2765 (32.423)

1.2665 (32.169)

.0120 (0.305)

1.2385 (31.458)

1.2205 (31.001)

1.5000 .1 .2 .0020 (0.0508)

1.4980 38.049

1.4860 (37.744)

.0120 (0.305)

1.4640 (37.186)

1.4540 (36.932)

.0120 (0.305)

1.4260 (36.220)

1.4080 (35.763)

1.6250 .1 .2 .0020 (0.0508)

1.6230 41.224

1.6110 (40.919)

.0120 (0.305)

1.5890 (40.361)

1.5790 (40.107)

.0120 (0.305)

1.5510 (39.395)

1.5330 (38.938)

1.8125 .1 .2 .0020 (0.0508)

1.8105 (45.987)

1.7985 (45.682)

.0120 (0.305)

1.7765 (45.123)

1.7665 (44.869)

.0120 (0.305)

1.7385 (44.158)

1.7205 (43.701)

2.0000 .1 .2 .0020 (0.0508)

1.9980 (50.749)

1.9860 (50.444)

.0120 (0.305)

1.9640 (49.886)

1.9540 (49.632)

.0120 (0.305)

1.9260 (48.920)

1.9080 (48.463)

1. Formulas for these values are in accordance with MIL-STD-1373.

2. For all other dimensions not shown refer to MIL-STD-1373.

3. Dimensions are in inches.

4. Metric equivalents (in millimeters) are given for information only.

FIGURE 9. Connector mating threads, external.

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3.4.2.1 Insert retention.

3.4.2.1.1 Inserts. Inserts shall be non-removable.

3.4.2.2 Inserts and wire sealing grommets. The insert assembly shall be one integral part and permit the removal and reinsertion of individual contacts without damage to the sealing members or contact retention device.

3.4.2.3 Contact arrangement. Contacts shall be arranged in accordance with MIL-STD-1698.

3.4.2.4 Contact spacing. Contacts shall be spaced in accordance with MIL-STD-1698.

3.4.2.5 Contact alignment. Inserts for socket contacts shall provide an overall side play of the socket contacts of .0025 to .0075 inch from the required position to facilitate alignment of mating pin contacts.

3.4.2.6 Pin contact stability. When tested as specified in 4.6.22 the total displacement of reference point on the contact tip end shall not exceed .030 inch maximum with a one-half pound force applied.

3.4.2.7 Contact retention member. The contact retention member shall be a machined metallic clip.

3.4.3 Coupling screw threads. Coupling screw threads shall be .1P-.2L-DS screw thread, modified, 60 stub, double, class 2A or 2B (see figures 8 and 9). Screw threads shall be checked after plating by means of ring or plug gages only, in accordance with FED-STD-H28. Slight out-of-roundness beyond the tolerance as specified on figures 8 and 9 is acceptable if the threads can be checked without forcing the thread gages. Screw threads may be relieved provided the relief does not interfere with proper performance of the screw threads.

3.4.4 Shell design. Connector shells shall be seamless and retain their inserts in a positive manner.

3.4.4.1 Lubrication. All internal coupling ring threads shall be coated with a lubricant during manufacture. Lubricants shall be non-flaking and galvanically compatible, and shall not migrate into threaded areas. Rear accessory threads of all connectors and receptacle coupling thread areas shall not be lubricated.

3.4.4.2 Spring fingers. All plugs shall include spring fingers. Spring fingers shall be installed to make peripheral electrical contact with the mating shell without interfering with proper engagement. The springs shall be retained about the plug periphery. Minimum engagement of the spring fingers shall be .040 inches (1.02 mm) prior to contact engagement.

3.4.4.3 Finish. All surfaces shall have a surface roughness finish (Ra) of 125 microinches (3.2 micrometers), unless otherwise specified herein.

3.4.4.4 Jam (panel) nut. The panel nut for M28840/14 connectors shall be as specified in the specification sheet. MS3186 may be used for procurement of spare panel nuts. Panel nuts in accordance with MIL-DTL-28840 connectors or parts do not require bayonet clearance slots.

3.4.5 Coupling connections. Threaded coupling rings shall be knurled, and designed so that the pin and socket contacts shall engage or disengage as the ring is respectively tightened or loosened. The coupling rings of connector plugs shall be captive to the shell.

3.4.5.1 Safety coupling rings. Coupling rings shall be designed for safety wiring. At least two holes shall be provided for shell sizes 15 and smaller, and at least three equally spread holes for connector shell sizes 17 and larger. These holes shall be of a diameter sufficient to accommodate .032 inch diameter wire.

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3.4.5.2 Shell polarization. Polarization of connectors shall be accomplished by matched integral key and keyway of counterpart connectors. The polarization of counterpart connectors shall take place before coupling rings are engaged.

3.4.5.2.1 Backshell polarization. The backshell splines key and keyway shall be polarized and mated prior to coupling.

3.4.5.3 Engagement seal. Connectors shall contain sealing means so that engaged connectors comply with the requirements specified herein. The design of the seal shall be such that in mated connectors all air paths between adjacent contacts and between contacts and shells are eliminated.

There shall be interfacial mating of the engaged connector insert to provide dielectric under compression of .005 inch minimum. Connector plug shells shall be provided with a static peripheral seal to ensure shell-to-shell sealing.

3.4.5.4 Safety wire holes. Safety wire holes shall not pull out when tested as specified in 4.6.24.

3.4.6 Wire sealing. Connectors, except box mounting receptacles, shall be provided with a wire sealing grommet capable of sealing on wire sizes specified in table III when used with suitable rear accessory (backshell).

3.4.6.1 Grommet sealing plug. The grommets of connecters shall be designed to accept sealing plugs in accordance with MS27488 in lieu of wire where unwired contacts are employed. Sealing plugs for 15 percent of the number of contacts, but not less than 1, shall be enclosed in the unit package. For indirect shipments, connectors may be ordered without grommet sealing plugs (see 6.2).

3.4.7 Wire separator. Box mounting receptacles shall have a wire separator in lieu of a wire sealing grommet, which shall extend to at least the rear end of the connector shell. The wire separator is not required to be capable of sealing on wires.

3.5 Intermateability and interchangeability.

3.5.1 Intermateability. Plug and receptacle connectors having the same shell size, keying, and contact arrangement shall be intermateable.

3.5.2 Interchangeability. All connectors and accessories having the same military PIN shall be completely interchangeable with each other with respect to installation (physical) and performance (function) as specified herein.

3.6 Magnetic permeability. The relative magnetic permeability of aluminum and stainless steel connectors and accessories shall be less than 2.0 µ and 5.0 µ, respectively, when tested as specified in 4.6.2.

3.7 Thermal shock. There shall be no evidence of damage detrimental to the operation of the connector after being subjected to the temperature extremes in 4.6.3.

3.8 Contact retention. The axial displacement of contacts shall not exceed .012 inch and contacts shall be retained in their inserts when subjected to an axial load of 20 pounds when tested as specified in 4.6.4.

3.9 Dielectric withstanding voltage. Connectors shall show no evidence of breakdown or flashover when subjected to the test voltage in 4.6.5.1. Corona shall not be considered as a breakdown.

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3.10 Vibration. Mated connectors shall not be damaged and there shall be no loosening of parts due to vibration. Counterpart connectors shall be retained in full engagement, and there shall be no interruption of electrical continuity of one microsecond or longer when tested as specified in 4.6.6.1.

3.11 High impact shock. Mated connectors shall not be damaged and there shall be no loosening of parts, nor shall there be an interruption of electrical continuity one microsecond or longer during the exposure to mechanical shock when tested in 4.6.7.

3.12 Contact resistance. Contacts in the mated condition shall meet the ambient (25°C) contact resistance requirements in accordance with SAE-AS39029 (see 4.6.8).

3.13 Durability. Counterpart connectors shall show no mechanical or electrical defects detrimental to the operation of the connector after 100 cycles of coupling and uncoupling in 4.6.9.1. The connectors shall be subjected to 50 cycles, before and after the corrosion test. No lubricant shall be applied prior to, during or after the test except as specified in 3.4.4.1.

3.14 Salt spray (corrosion). When tested in 4.6.10, connectors shall show no lifting of plated coating or exposure of basis material under three power (3X) magnification which adversely affects performance when evaluated in accordance with EIA/ECA-364-26.

3.15 Insulation resistance.

3.15.1 Insulation resistance, ambient temperature. The insulation resistance at 25°C (77°F) shall be greater than 5000 megohms when tested in 4.6.11.2.

3.15.2 Insulation resistance, elevated temperature - (long time). The insulation resistance shall be

1000 megohms at 200°C as specified on figure 1 when tested in 4.6.11.3.

3.16 Fluid immersion. When tested as specified in 4.6.12, the connectors shall meet the requirements for coupling torque (see 3.28) and dielectric withstanding voltage (see 3.9).

3.17 Insert retention. Inserts shall not be dislocated from their original positions or damaged when they are subjected to the specified pressures specified in 4.6.13.

3.18 Humidity. Mated connectors with any rear accessory hardware assembled shall maintain an insulation resistance of 100 megohms or greater at 25°C after being subjected to the humidity test in 4.6.14.

3.19 Water pressure.

3.19.1 Sealing connectors. Mated connectors assembled with backshells shall exhibit an insulation resistance of 100 megohms or greater after being subjected to the water pressure test. They shall show no evidence of entrance of water when subjected to the test in 4.6.15.

3.19.2 Backshells. Cable adapters shall show no evidence of entrance of water when subjected to the water pressure test in 4.6.15.

3.20 Cable pull-out. Cables shall not pull out when the loads are applied in 4.6.16, nor shall the slippage exceed .125 inch.

3.21 External bending moment. Connectors shall exhibit no evidence of damage, as revealed by inspection with 3X magnification, when stressed using the applicable bending moment in 4.6.17.

Not for Resale, 04/04/2019 14:33:52 MDTNo reproduction or networking permitted without license from IHS

3.22 Shell conductivity. Mated connectors shall be electrically conductive from the plug accessory thread to the receptacle mounting flange or to the accessory thread on the cable connecting receptacle.

The overall dc resistance shall not exceed 0.005 ohms when measured in 4.6.18.1. When tested with accessory on, the dc resistance shall not exceed 0.010 ohms when measured in 4.6.18.2.

3.23 Maintenance aging (contact installing and removal forces). The forces required to install and remove unlocked contacts shall not exceed 10 pounds maximum when tested in 4.6.19.

3.24 EMI shielding. When tested as specified in 4.6.21, the EMI shielding capabilities of mated…

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File details come from the government source that posted it. Updated Aug 26, 2020.