SKZ36103755_Rev_E.pdf

1. Scope -

When this document is referenced the tolerances and limits herein are the maximum permissible for applicable, untoleranced dimensions shown on the drawing, and unless otherwise specified the practices herein are required where applicable.

1.1 The phrase "unless otherwise specified" applies to all sections of this document.

2.0 Dimensions Interpretation -

2.1 All dimensions are per the international inch, which equals 2.54 centimeters.

2.2 All limits are considered to be absolute and shall be interpreted in accordance with ANSI Y 14.5. Therefore finished parts exceeding the specified limits to any degree, regardless of magnitude, shall be considered as not meeting drawing requirements.

2.3 Dimensions and tolerances of form and position and dimensional terminology shall be interpreted in accordance with ANSI Y 14.5.

2.4 All requirements of detail and assembly drawings apply after all processes employed to produce the items are completed. Where dimensional and other requirements are not specified for an assembly, the requirements specified for the detail shall still apply at assembly.

2.5 All dimensions apply when parts or assemblies are free from external force(s) except that when parts or assemblies are subject to free state variations (are non-rigid) the dimensions shall be interpreted in accordance with ANSI Y 14.5.

2.6 Dimensions of a part to which inorganic finishes such as platings and oxides, or other similar finishes are applied, shall be finished product requirements.

Dimensions of a part to which phosphates or organic finishes such as paints, lacquers, other similar finishes applied, shall be the requirements before application of the finishes.

2.7 Dimensions shall apply at a part and measuring instrument temperature of 68° F (20° C).

2.8 There shall be no repair or restoration of material by any process without prior approval from the organization initiating the fabrication request.

3.0 Surface Texture -

3.1 Interpretation of surface texture symbols shall be in accordance with ASA-B-46.1.

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3.2 On drawings that do not show a texture symbol for surfaces, the values shown apply.

SURFACE MAX ROUGHNESS

PRECISION HOLES (SEE 7.7) 63

THREAD SURFACES 63

DRILLED HOLES OR COUNTERBORES 250

CUT-OFF ENDS OF BAR STOCK 250

ALL OTHER SURFACES 125

3.3 Surfaces may be produced by any process that will create the surface texture specified.

4.0 Definitions of terms as used in this standard or on drawings that reference this standard.

• Axis - The real or imaginary straight line through the center of a part.

• Burr - Any displaced base material extending beyond either of two machined or formed intersecting surfaces.

• Camber - The greatest deviation of the side edge (bar, strip, sheet) from a straight line.

• Deep Hole Drilling - The drilling of a hole to a depth exceeding five times the nominal diameter of the drill.

• Machining - The removal of material from a rigid or semi rigid part by any means, e.g. mechanical, chemical, or electrical (excluding flame cutting).

• Re-entrant Angle - An angle of less than 180° whose vertex penetrates into the material. The angle may be on either an external or an internal surface.

• Runout, Axial - The deviation of the actual centerline from a theoretically straight line.

• Runout, Face - The total axial readings shown when the indicator contacts the face through

360°revolution. It is generally read relative to some "trued" portion of the part, e.g. when other means of checking squareness are not practical. This face is sometimes called "lateral runout".

NOTE: A face runout check does not measure concavity and convexity, which come under the term flatness.

• Surface Defects - Irregularities that occur at one place or at relatively infrequent or widely varying intervals in a surface. Defects include but are not limited to scratches, nicks, gouges, dents, ridges, prick punch marks, weld spatter and tool chatter marks.

• Surface of Revolution - A surface, either external or internal, generated during a machining or forming process when either the work piece or the tool is revolved about an axis, which is stationary relative to the opposing tool or work piece.

• TIR - Total (or full) Indicator Reading, See 15.2.

• Typical (Type) - When associated with a dimension or feature that appear to be identical in size and configuration.

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5.0 Corners

5.1 Sharp Edges -

When a sharp edge is shown but not specified, burrs and sharp edges shall be removed to leave a radius, a chamfer, or a combination of these. The corner may be dulled by any process, which produces a radius or equivalent between .005 and .020. Gages are not required. Conformance may be determined by visual or feel inspection. When drawings specify "sharp corner" radii or chamfers, up to .003 will be permitted.

CONFIGURATION OPTIONAL WITHIN LIMITS OF RADIUS AND CHAMFER

5.2 Inside corners (re-entrant angles) - When an inside corner is shown without either a fillet radius or an undercut specified, the fillet may be .00 - .03R. When either of these surfaces adjacent to such corners is to be ground, a tool relief undercut as shown by dimensions AA and AB is permitted. When the limits of the fillet radius are specified no undercut is permitted.

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TOOL RELIEF FOR GRINDING

AA

AB ROVER INCL

.12 .25 .003 - .005 .005 - .010

.25 .50 .003 - .008 .005 - .010

.50 - 006 - .011 .005 - .015

5.3 Tangent Radii

When a dimensioned radius is shown as tangent, the radius shall be tangent to the adjacent surface(s) within ±

.005 except that any resultant step or undercut shall not exceed the specified max-min limits of the adjacent surface(s) and shall be blended.

6.0 Chamfers -

6.1 Chamfers on external threaded ends - All threaded ends shall be chamfered 25° to 50° (measured from the cutoff plane). The width of chamfer on the cut off end shall be from 1 (min.) to 1 % (max.) times the depth of thread.

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7.0 Holes

7.1 Displaced Material -

Displaced material, either solid or loose, (e.g. drill or broach chips, curls, burrs, etc.) shall be removed from all holes and recesses.

7.2 Depth of Hole -

The depth "A" of hole shall be measured from the surface drilled to the depth of the full diameter.

7.2.1 Holes, Depth, Tap Drill -

The tap drill depth beyond the specified perfect thread length shall not exceed the values tabulated here

TAP DRILL

DIAMETER

TAP DRILL DEPTH

BEYOND FULL THREAD

MINIMUM MAXIMUM

.04 - .50 INCL 5P 5P + .06

OVER .50 5P 5P + .10

(P = Pitch of thread)

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7.2.1 Holes, Depth, Tap Drill - (Continued)

7.3 Squareness of plain holes delineated at right angles to surfaces - (for holes see 13.3) For holes up to and including .125 diameter, the axis of the hole shall be square with the face within 1° 30' (.026/inch of R max);

over .125 diameter, the axis shall be square with the face within 1° (.017/inch of R max). In no case shall the angularity of the hole allow any part of the centerline of the hole to exceed the locational tolerance designated.

7.4 Size-diametral dimensions for holes are the max-min limits; drill size callouts are for reference only.

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7.5 Shape of Holes -

A hole may be out-of-round, tapered, or wavy provided that the diameter at any point in the hole is within the diametral limits, and that a minimum diameter cylindrical plug gage can be inserted the full length of the hole.

7.6 Countersink for Threaded Holes -

All holes for threading shall be countersunk 80°- 120° before threading to prevent burrs. Through holes shall be countersunk at both ends where practical. Through or blind holes having four or fewer threads shall be countersunk to the major diameter of thread (C) ±.01. Holes having more than four threads shall be countersunk to diameter "D" shown in table.

THREAD SIZE

C

COUNTERSINK DIAMETER

"D"

No. 2 (.086) .09 - .12

No. 4 (.112) .12 - .15

No. 6 (.138) .15 - .19

No. 8 (.164) .19 - .22

No. 10 (.190) .22 - .25

.250 .28 - .31

OVER .250 (C + .03) - (C +.06)

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7.6 Countersink for Threaded Holes - (continued)

7.7 Precision Holes -

A precision hole is one whose diametral tolerance does not exceed .002.

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7.7.1 Alignment and Roundness -

The alignment of precision holes delineated in line with other precision holes shall be measured in terms of total indicator reading (TIR). Parallelism of in-line holes with a machined base shall be within the tolerances on the hole location. Holes shall be round within a TIR equal to one-half the diametral tolerance.

DISTANCE "E" TIR BETWEEN

BORES F & GOVER INCL

0 12 .001

12 18 .002

18 - .003

7.7.2 Squareness -

A precision hole delineated at a right angle to an adjacent machined surface shall be square with that surface within "J" max = .0005 in./inch of "H" for "H" less than one inch "J" max = .0005.

7.8 Hole spacing on a bolt circle -

When holes in a bolt circle are specified on the drawing as equally spaced the specified tolerance shall be non-cumulative.

When there are other cylindrical surfaces on the same part with a bolt circle, the bolt circle shall be concentric with the axis of the adjacent cylindrical surface having the smallest diametrical tolerance within a TIR equal to the tolerance specified on the bolt circle diameter.

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8.0 Alignment -

8.1 Feature Delineated on a Centerline -

Where a feature such as a hole or slot (except per 10.2) is delineated on the centerline of a part, the feature center shall be on the centerline of a part, the feature center shall be on the centerline of the finished part within .01 D either side of centerline.

8.2 Features at Right Angles -

Center lines of features, delineated at right angles to each other shall be square within 1° (.017 inch/inch) but not to exceed .030 at distance "R" up to including 3", .045 above 3" to including 6" .060 above 6".

8.3 Interrupted Surfaces -

Interrupted surfaces delineated in the same plane shall be on a common plane with each other within the values given in the table.

TOTAL TOLERANCE

ON DIMENSION "M"

TOLERANCE "N"

OVER INCL

0 .020 .002/IN. OF "L" TO A MAX. OF

.006 BUT NOT TO EXCEED

LIMITS OF DIM "M"

.020 --- .006

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8.4 Parallelism of Surfaces -

Surfaces delineated parallel to each other shall be parallel within "P".

TOTAL TOLERANCE

ON DIMENSION "S"

TOLERANCE "P"

OVER INCL

0 .020 .001/IN. OF "L" TO A MAX. OF .010 BUT NOT TO

EXCEED LIMITS OF DIM. "S"

.020 --- .010

8.5 Squareness of Machined Surfaces -

Any machined surface delineated at 90° to another surface or to a centerline shall be square with that surface or centerline within .002 per inch of surface up to .020 maximum.

8.6 Flatness of Machined Surfaces -

The flatness of a machined surface shall be within "T" except that in no case shall "T" fall outside the locational limits of the surface.

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8.6 Flatness of Machined Surfaces (continued)

SURFACE

ROUGHNESS LENGTH "U" TOTAL "T"

0 6 .001

UP TO 32 INCL. 6 12 .002

12 --- .004

0 6 .004

63 125 250 6 12 .008

12 --- .012

8.7 Warpage of Machined Parts -

Warpage of machined parts (circular, square, rectangular, or irregular in shape) which are machined on the flat surface or surfaces shall not exceed "W". These warpage tolerances shall be separate from the part thickness tolerance.

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MATERIAL THICK DIA. OR LENGTH "V"

TOTAL "W" MAX.OVER INCL. OVER INCL.

.06 .12 0

.01

.02

.04

.07

.12 .20 0 2 .007

2 6 .010

6 --- .015

.20 .50 0 2 .007

2 6 .010

6 --- .015

.50 1.00 0

.005

.007

.010

.015

1.00 1.50 0

.0025

.005

.007

.010

9.0 Staking of Flat Head Screws -

When staking of flat head screws is specified on the drawing, the screws shall be firmly secured by staking at each end of slot.

The staking tool shall be of proper shape and size to produce a flow of adjacent metal into screw head slot.

10.0 Keyways -

Keyways, Corner Radii -

Internal corner radii of key seats and keyways shall be as tabulated.

KEYSEAT AND KEYWAY

DEPTH

RADIUS MAXOVER TO

.031

.094

.156

.094

.156

.312

.005

.010

.015

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10.2 Keyways, Radial Location -

When delineated on a drawing as being in-line but not otherwise specified, the radial position of keyways, splines, and gear teeth may be at random with respect to each other or to other features, when random location is not permissible, the drawing will specify the relationship.

10.3 Keyway Location Relative to Centerlines -

10.3.1 The centerline of a keyway in a shaft or bore shall be centered within the tolerance "Y" (10.3.3)

10.3.2 When a drawing shows two or more keyways in line in a shaft or bore and specifies "keyways must be in line", each such keyway shall be on a common centerline and on the centerline of the shaft or bore each within tolerance "Y" (10.3.3).

10.3.3 When two keyways are delineated at 90° (or dimensioned at other angular locations), the centerline of one keyway shall be on the centerline of the shaft or bore within tolerance "Y" and the centerline of the second keyway shall be 90° (or other specified angle) from the first keyway within "Y" measured at radius "R".

DIAMETER "X" TOL "Y"

OVER INCL MAX.

.00 .50 .001

.50 4.00 .002

4.00 --- .003

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11.0 Axes and Surfaces or Revolution -

11.1 Coincident axes (concentricity) - (for threads see 13.4) where a common axis * is shown for more than on surface of revolution on the same part, the axis for each such surface shall be coincident with the common axis within a TIR equal to one half the tolerance on the diameter involved. This TIR includes run out due to out of roundness. (For non-rigid parts see 2.5)

* This includes axes on the same part which if extended would be common.

11.2 Roundness - (For non-rigid parts see 2.5)

A surface of revolution shall be round within a TIR equal to one half the diametral tolerance.

12.0 Centers for Machining -

Centers for machining are optional in the completed part. When centers are used the diameter (AD) shall be determined by the minimum diameter (AC) of groove, thread, etc., in the area of the centers. Centers shall be in accordance with the table.

When centers are required in the completed part they will be specified on the drawing.

When centers are not allowed in the completed part it should be stated on the drawing.

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DIAMETER AC AD MAX. AE AF

CENTER

DRILL NO.

.12 TO .15 INCL. .08 .05 .08 1

OVER .15 TO .19 INCL .12 .08 .11 2

OVER .19 TO .25 INCL. .13 .08 .12 2

OVER .25 TO .38 INCL. .16 .08 .14 2

OVER .38 TO .62 INCL. .22 .12 .20 4

OVER .62 TO 1.00 INCL. .26 .12 .23 4

OVER 1.00 TO 1.50 INCL. .35 .19 .31 5

OVER 1.50 TO 2.00 INCL. .38 .19 .34 5

13.0 Threads -

13.1 General - All elements of designated screw threads shall be in accordance with national bureau of standards handbook H-28.

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13.2 Threads Lengths -

When a part is shown to be threaded to a shoulder, all thread - elements shall be within specified limits to within three threads from the shoulder ; no undercut permitted. When a part has a defined length of threads

(L), either internal or external, all thread elements shall be within specified limits up to the full-defined length.

When such threads do not end at a shoulder, undercut or hole bottom, there may be additional perfect or imperfect threads and up to three and one half for external threads and up to five for internal threads. When undercuts are shown on a drawing but not dimensioned, the following dimensions and tolerances apply:

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13.3 Squareness of Threads -

(External & Internal) The actual axis of threads delineated as square with adjacent face or shoulder shall be square within .005/inch of radius.

13.4 Concentricity of Threads -

(External & Internal)

Threads shown as having a common centerline with each other or with adjacent cylindrical surfaces

(disregarding tool relief of other similar undercuts) shall be concentric with each other and with adjacent cylindrical surfaces within .01 TIR.

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14.0 Faces -

14.1 Squareness of Faces -

Faces and shoulders delineated at right angle to an axis of revolution shall be square within .002 up to 1" radius. Above 1" radius the squareness shall be within .002/IN. of radius "R" except that no portion of face or shoulder shall be outside the limits.

14.2 Runout, Face -

The runout for faces and shoulders shall be .002 TIR up to 1" radius. Above 1" radius, the lateral runout shall be within a TIR of .002/Inch of radius "R". No portion of face or shoulder shall be outside the limits of length, nor shall the runout exceed .005 TIR at any radius.

15.0 Practice -

15.1 Stock - When the word stock or (stk) follows a normal dimension, the commercial mill tolerance and surface texture for the specified material and raw stock size shall apply.

15.2 TIR - Where TIR is specified, other means of measurement may be used which will provide equivalent values.

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16.0 Welding -

This section of the document contains the minimum requirements for visual inspection and acceptance of welds.

General Requirements -

A. The quality of weld shall be verified by visual examination at 1X magnification. Inspection shall be performed in the "as-welded" condition.

B. The following shall be causes for rejection when visually observed on any weld:

1. Cracks in base metal or weld. NOTE: No cracks, regardless of size or location, shall be permitted.

2. Porosity or gas pockets - surface holes or areas void of solid material.

3. Craters - Depressions at the termination of welds.

4. Undercutting - Erosion or notching of the base metal at the fusion line. NOTE: Undercuts shall not be sharp

"V" shaped or exceed 1/32 inches in depth nor 2 inches in length; or 10� of the base material thickness, nor 2 inches in length whichever is least.

5. Non-metallic inclusion - Oxides or other solids encountered as inclusions in the weld.

6. Weld spatter - All weld spatter shall be removed.

7. Bead appearance - Weld beads shall present a neat workmanlike appearance.

8. Burn through - Caused by excessive penetration of the weld bead.

16.1 Angular Tolerance - Welded Studs

The angle of welded studs shall not exceed 1° per inch of "A" in any direction.

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16.2 Fillet Welds, Outside Corners -

Unless otherwise specified the following practices shall be applied to outside corner fillet welds for aluminum and steel.

A. A lap corner construction shall be used for material thickness of .062 and over. (See Figure A).

B. Welds shall be reinforced with a melt-through. The size (L) (Leg and throat) of the melt-through shall be as specified in Figure A.

C. The minimum outside fillet weld size ( Leg and throat) shall be as follows:

1. The size specified on the drawing shall be considered minimum.

2. When the size is not specified on the drawing, the minimum size shall be equal to the thickness of the thinner member welded. (See Figure A).

D. The maximum outside fillet weld size (Leg and throat) shall be equal to the minimum size plus (+) "H" as shown in Figure A.

Figure A

(See Table 1)

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T

THICKNESS

H L (ALUM) L (STEEL)

MAX MIN MAX MIN MAX

.030 .020 .02 .07 .02 .07

.040 .030 .03 .08 .03 .08

.050 .040 .04 .09 .04 .09

.062 .045 .04 .09 .04 .09

.094 .045 .06 .12 .06 .12

.125 .045 .06 .12 .06 .12

.188 .062 .09 .16 .06 .12

.250 .062 .09 .16 .06 .12

TABLE 1

16.3 Fillet Welds, Inside Corners -

Unless otherwise specified the following practices shall be applied to inside corner fillet welds for aluminum and steel.

A. The minimum inside fillet weld size (Leg and throat) shall be as follows:

1. The size specified on the drawing shall be considered minimum.

2. When the size is not specified on the drawing the minimum size shall be equal to the thickness of the thinner member welded (See Figure A).

B. The maximum inside fillet weld size (Leg and throat) shall be as follows:

1. Equal to the size specified on the drawing plus (+) .062.

2. When the size is not specified on the drawing the maximum size shall be as show in Figure B.

Figure B (See Table 1 next page)

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T L

THICKNESS MIN MAX

.03 .03 .10

.04 .04 .11

.05 .05 .12

.062 .06 .12

.094 .09 .16

.125 .12 .18

.188 .18 .25

.250 .25 .32

TABLE 1

16.4 Square - Groove Welds

Unless otherwise specified the following practices shall be applied to square-groove welds for aluminum and steel.

A. The nearside (symbol side) of the weld shall exhibit an approximately flat-faced condition(s) as shown in

"Figure C" without recourse to any method of finishing.

B. The far side (opposite symbol side) of the weld shall exhibit a reinforcement melt-through (H) as shown in

Figure C.

FIGURE C

(SEE TABLE 1)

T S H

.062 .03 - .06 .02 - .06

.094 .03 - .06 .02 - .08

.125 .03 - .09 .02 - .08

TABLE 1

NOTE: Materials in excess of .125 thickness that need to be butt-welded should have a bevel groove weld.

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Relief Slot For Out Gassing in Vacuum Application -

17.0 Typical Heads

THREAD SIZE A ± .002 B +. 004/-.002 THREAD SIZE A ± .002 B +. 004/-.002

4-48 UNF .0994 .020 1/2-20 UNF .463 .032

4-40 UNC .0992 .020 1/2-13 UNC .445 .032

5-44 UNF .107 .020 9/16-18 UNF .522 .032

5-40 UNC .106 .020 9/16-12 UNC .504 .032

6-40 UNF .117 .020 5/8-18 UNF .585 .063

6-32 UNC .113 .020 5/8-11 UNC .560 .063

8-36 UNF .141 .020 3/4-16 UNF .704 .063

8-32 UNC .139 .020 3/4-10 UNC .679 .063

10-32 UNF .161 .020

10-24 UNC .159 .020

1/4-28 UNF .223 .032

1/4-20 UNC .212 .032

5/16-24 UNF .281 .032

5/16-18 UNC .272 .032

3/8-24 UNF .343 .032

3/8-16 UNC .331 .032

7/16-14 UNC .386 .032

7/16-20 UNF .400 .032

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18.0 Sheet Metal Practices

18.1 Scribed layout lines are not permissible on aluminum.

18.1.1 Sheared edges shall be smoothed by draw filing, machining, or sanding to remove rough edges.

18.1.2 Edges of aluminum, at break lines, shall be full radiused and sanded smooth with strips of 220 grit emery cloth prior to breaking.

18.1.3 Radii for bend relief when pictorially shown on the drawing, but not dimensioned, shall be 1/2 of the bend allowance. The cutouts shall be uniform in size and location for each bend.

18.1.4 Break dies shall be clean and free of nicks or protrusions.

18.1.5 Proper dies for breaking shall be used to provide radius required by drawing without thinning or die marking parent metal.

18.1.6 Flight, aircraft, or GSE hardware shall not be fabricated from scratched or defaced metal. Scratched or defaced metal may be used for other hardware if it does not detract from appearance or strength.

18.1.7 Direction or grain, when not specified on drawing, shall be perpendicular to break lines. When two or more angles are to be broken, breaking with the grain shall be on the longest break line.

18.2 Angularity, Formed Parts -

Unless otherwise specified, angularity tolerance shall be as indicated below:

"B" Shall not be such as to exceed linear tolerance of "C" or "A"

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18.3 Flatness, Sheet Metal Parts -

Flatness shall be as indicated below:

MATERIAL

THICKNESS

ALL TOLERANCES PLUS OR MINUS

FROM TO & INCL TOLERANCE

PER INCH

MAXIMUM TOLERANCE

TO 16" INCL 16" TO 48" INCL

--- .062 .006 .090 .125

.062 .093 .007 .100 .140

.093 .125 .009 .125 .175

--- .062 .003 .040 .055

.062 .093 .004 .050 .070

.093 .125 .005 .065 .090

--- .062 .004 .050 .070

.062 .093 .005 .065 .090

.093 .025 .007 .100 .140

--- .062 .003 .040 .055

.062 .093 .005 .065 .090

.093 .125 .007 .100 .140

NOTE: Flatness deviation to be measured perpendicular at the point of maximum departure of the curved edge from a straight line joining the extremities of the edge.

18.4 Holes, Bell Mouth -

When a punched hole has a bell mouth flare extending into the hole, the bell mouth shall not exceed 1/3 the material thickness. This may cause the hole to be out of tolerance for 1/3 the material thickness.

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18.5 Twist, Formed Parts -

Tolerance on the twist will not exceed the value given in the table below.

THICKNESS OF

MATERIAL LENGTH "L" TOLERANCE FOR TWIST "Y"

FROM TO & INCL

UP TO AND ---- 1.00 ± .015

INCLUDING 1.00 12.00 ± .030

.125" 12.00 24.00 ± .046

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