Spec 1.pdf

AMSC N/A FSC 6145

Distribution Statement A. Approved for public release: distribution is unlimited.

INCH-POUND

MIL-DTL-24643/64B

27 November 2023

SUPERSEDING

MIL-DTL-24643/64A

w/INT. AMENDMENT 1

11 July 2011

MIL-DTL-24643/64A

28 January 2010

DETAIL SPECIFICATION SHEET

CABLE, ELECTRICAL, TWISTED SHIELDED PAIR(S), -4 DEGREES FAHRENHEIT (-20 DEGREES

CELSIUS) TO +194 DEGREES FAHRENHEIT (+90 DEGREES CELSIUS), 600 VOLTS, TYPE LSTPSJ

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

The requirements for acquiring the product described herein shall consist of this specification sheet and

MIL-DTL-24643.

Construction (Non-Watertight)

First - Copper conductor, tin-coated, in accordance with ASTM B286 (see table I for sizes).

Second - Separator may be used at manufacturer’s option where required to provide free stripping insulation.

Third - Thermoset insulation. Nominal 0.010 inch (see table I for finished wire diameter).

Fourth - Two conductors (one black and one white) twisted together with a lay length as specified in table II. Twisted pair identification code applied by method 6 if more than one pair in cable.

Fifth - An optional binder.

Sixth - Braided shield of 36 AWG tin-coated copper. Minimum coverage shall be 90 percent and the braid angle shall be between 20 and 40 degrees.

Seventh - The required number of pairs (see table III) cabled together with a lay length as specified in 3.4.4 of MIL-DTL-24643. Fillers may be used as required to form a firm, well-rounded assembly. Cabling sequence shall be consecutive for four pair cables.

NOTE: For one pair cable, omit the seventh step.

Eighth - An optional binder.

Ninth - Cross-linked polyolefin jacket. Jacket wall thickness shall be 0.030±0.005 inch for cables with core diameters less than 0.300 inch. Jacket wall thickness shall be 0.040±0.005 inch for cables with core diameters greater than or equal to 0.300 inch (see table III for finished cable diameter).

NOTE: Manufacturer’s identification tape is required (see 3.4.9 of MIL-DTL-24643).

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TABLE I. Wire configurations and dimensions.

Conductor size

(AWG)

Stranding

(inches)

Conductor diameter

(inch)

(±0.003 inch)

Finished wire diameter (inch) Conductor resistance

(ohms) min. max.

24 19 x 36 0.024 0.041 0.047 25.91

22 19 x 34 0.030 0.047 0.053 16.21

20 19 x 32 0.039 0.056 0.062 9.95

18 19 x 30 0.049 0.066 0.072 6.34

16 19 x 29 0.056 0.073 0.079 4.92

14 19 x 27 0.070 0.087 0.093 3.11

TABLE II. Length of lay.

Wire size range Lay length Twist tolerance

(inch)

20-24 1 ±0.25

14-18 1.5 ±0.25

TABLE III. Finished cable details.

Military part no.

M24643/64

Type and size

Conductor size

(AWG)

Number of pairs

Finished cable diameter (inch)

(±0.016 inch for single pair cables)

(±0.030 inch for multi-pair cables)

-01UN LS1TPSJ-24 24 1 0.170

-02UN LS1TPSJ-22 22 1 0.182

-03UN LS1TPSJ-20 20 1 0.200

-04UN LS1TPSJ-18 18 1 0.220

-05UN LS1TPSJ-16 16 1 0.234

-06UN LS1TPSJ-14 14 1 0.262

-07UN LS2TPSJ-24 24 2 0.260

-08UN LS2TPSJ-22 22 2 0.285

-09UN LS2TPSJ-20 20 2 0.325

-10UN LS2TPSJ-18 18 2 0.390

-11UN LS2TPSJ-16 16 2 0.420

-12UN LS2TPSJ-14 14 2 0.465

-13UN LS3TPSJ-24 24 3 0.275

-14UN LS3TPSJ-22 22 3 0.285

-15UN LS3TPSJ-20 20 3 0.325

-16UN LS3TPSJ-18 18 3 0.390

-17UN LS3TPSJ-16 16 3 0.450

-18UN LS3TPSJ-14 14 3 0.490

-19UN LS4TPSJ-24 24 4 0.295

-20UN LS4TPSJ-22 22 4 0.325

-21UN LS4TPSJ-20 20 4 0.395

-22UN LS4TPSJ-18 18 4 0.450

-23UN LS4TPSJ-16 16 4 0.480

-24UN LS4TPSJ-14 14 4 0.540

REQUIREMENTS:

Qualification required.

INSPECTION:

Basic electricals:

Conductor resistance

(ohms/1,000 feet at 77 °F [25 °C], max.)

See table I

Voltage withstand (volts, root mean square, min.)

Conductor to conductor 2,000

Conductor to shield 1,000

Insulation resistance (megohms/1,000 feet, min.)

Conductor to conductor 500

Conductor to shield 500

Conductor and shield continuity No failure

Jacket flaws No failure

Group A:

Visual and dimensional No failure

Group B:

Cold bending (cable) No failure

Thermoset proof test (percent, max.)

Insulation 50

Jacket (when tested at 392 °F [200 °C]) 50

Physicals (unaged)

Insulation (extruded insulation only)

Tensile strength (lb/in2, min.) 700

Elongation (percent, min.) 150

Jacket (cable)

Tensile strength (lb/in2, min.) 1,300

Elongation (percent, min.) 160

Tear (lb/in thickness, min.) 35

Group C:

Physicals (aged) (air oven)

Insulation (extruded insulation only)

Tensile strength (percent of unaged, min.) 75

Elongation (percent of unaged, min.) 75

Jacket (cable)

Tensile strength (percent of unaged, min.) 60

Elongation (percent of unaged, min.) 60

Shrinkage No failure

Heat distortion (percent of unaged, max.) 30

Permanence of printing (insulation) (cycles, min.)

(applicable to multi-pair cables only)

Permanence of printing (jacket) (cycles, min.) 125

Shield (conformance to material, constructions, and coverage)

No failure

Surface transfer impedance

(type LS1TPSJ only)

Milliohms per meter (max.) Not applicable

Electromagnetic pulse (EMP) response

(dB, min.)

Not applicable

Group D:

Flame propagation (finished cable) No failure

Qualification inspection:

Qualification inspection shall include basic electricals; groups A, B, C, and D; plus the following:

Aging and compatibility (cable) No failure

Abrasion resistance (jacket) (scrapes, min.) 75

Acid gas equivalent (percent, max.)

Jacket 2

Fillers 2

Insulation 18

Halogen content (percent, max.)

Jacket 0.2

Fillers 0.2

Insulation 0.2

Immersion (jacket)

Tensile strength (percent of unaged, min.) 50

Elongation (percent of unaged, min.) 50

Smoke index (max.)

Jacket 25

Fillers 45

Insulation 45

Toxicity index (max.)

Jacket 5

Fillers 5

Insulation 1.5

Weathering (jacket) No failure

Electrical moisture absorption

(extruded insulation only)

No failure

Durometer (jacket) – type A (hardness, min.) 80

UNIT ORDERING LENGTHS:

Type and size Feet (nominal)

LSTPSJ (all sizes) 1,000

CHANGES FROM PREVIOUS ISSUE: Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.

CONCLUDING MATERIAL

Custodians: Preparing activity:

Army – MI Navy – SH

Navy – SH (Project 6145-2013-080)

Review activities:

Army – AR, CR

Navy – CG, EC

DLA – CC

NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the

ASSIST Online database at https://assist.dla.mil.

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