MIL-R-47196A(MI)
6 September 1977
SUPERSEDING
MIL-R-46196(MI)
12 July 1974
This specification is approved for use by US Army Missile Command, Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense.
SPECIFICATIONS | |
|
|
|
|
STANDARDS | |
|
|
|
|
(Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.)
3.2 Preparation for installation.
3.2.1.2 Piercing. Only piercing tools which produce-true and clean holes, equivalent to acceptable drilled holes may be used. Piercing tools shall not be used without written approval from the procuring activity. If piercing is used, all holes shall be inspected for radial cracking.
3.2.1.3 Hole size. Hole size for rivets shall conform to Table I unless otherwise specified on the engineering drawing or specification.
3.2.1.4 Countersinking. Countersinking shall be used in the installation all flush type rivets. Countersinks shall be produced with a tool that incorporates an automatic stop countersinking feature. The countersinking tool shall be held at 90 degrees to the work surface during the entire cutting cycle. Countersinks shall be free of chatter marks and concentric with the rivet holes. The countersink diameter shall be in accordance with Table VI unless otherwise specified on the applicable engineering drawings or specifications.
3.3 Installation.
3.3.4 Multiple (gang) riveting
3.3.5 Riveting contoured surfaces. Tack rivets or other suitable devices at increments of every fifth or sixth hole must be used before final riveting when riveting contoured surfaces.
3.3.6 Countersunk rivet head flushness. Unless otherwise specified on the engineering drawing or specification, flushness limits shall be 0.010 inch above to 0.005 inch below the material surface. Countersink diameters are provided in Table IV for reference.
3.3.7 Shaving countersunk rivets. Rivets failing to meet flushness requirements may be shaved to new close tolerances. The material surface shall not be damaged by the shaving tools. The stop device on the shaver shall be adjusted so that it extends 0.001 inch to 0.002 inch beyond the cutter and the setting shall be tested prior to shaving the rivet head. The cutter used in the shaver shall be larger in diameter than the rivet head. Table V contains recommended cutter diameters. Shaved rivets may not protrude prior to shaving in excess of the dimensions shown in Table IV. The minimum head diameter after shaving shall be as specified in Table IV.
3.4 Repair procedure. Any repairs exceeding the limitations listed in the subparagraphs hereunder are prohibited without prior written approval from the procuring activity.
3.4.1 Oversize rivet holes. When rivet holes are enlarged beyond specified tolerances, the next larger rivet size (diameter) may be used provided the row spacing, pitch and edge margin minimum are maintained and the requirements of paragraph 3.4.3 are not exceeded. The pitch is defined as the distance between the holes centers of adjacent rivets in a row. For pitch minimums, see Table VII. Row spacing minimum shall be .866 times the rivet spacing nominal dimension as given on the drawing. Edge margin is defined as the distance between hole centers and the edge of the material. There are two types of edge margins, visible and invisible. When viewed from the outside, or the side from which the rivet is inserted, the material edge in view is the visible edge and the edge hidden is the invisible edge. In case of conflict between the side rivet is inserted or outside, outside shall take precedence. See Table VIII for edge margin minimums. .
3.5 Corrosion prevention. When the rivet material is dissimilar to the material being riveted (reference MIL-STD-171), the rivet hole, countersink, and rivet shall be coated with zinc chromate primer in accordance with TT-P-1757 prior to installation. The rivet shall be installed while the primer is in the wet condition.
3.6 Finishing of riveted surfaces. Unless other finishing requirements are specified on the engineering drawing, surfaces which are painted, primed or chemically treated prior to riveting shall have the surfaces, including rivets finished in the same manner after riveting, per specifications applicable to the parent material. Any exterior damage to the finish of the parent material shall be touched up to the same requirements.
3.7 Workmanship. Installation of buck type rivets shall be accomplished in a workmanlike manner. Rivet assemblies shall be of uniform quality and free from cracks, gaps, sharp edges, burrs, loose parts, or other defects which might render the assemblies unsuitable for its intended purpose.
Custodian:
|
Preparing activity:
|
U..S GOVERNMENT PRINTING OFFICE. 1977-703.020/5447 | Project No. 5320-A005 |
Rivet Diameter (inches) | Recommended Drill Sizes | Hole Diameter Limits | |
---|---|---|---|
Minimum | Maximum | ||
1/16 | #51 (0.067) | 0.062 | 0.072 |
3/32 | #40 (0.098) | 0.093 | 0.103 |
1/8 | #30 (0.128) | 0.125 | 0.135 |
5/32 | #21 (0.159) #20 (0.161) |
0.156 | 0.171 |
3/16 | #11 (0.191) #10 (0.194) |
0.187 | 0.202 |
7/32 | #1 (0.228) | 0.218 | 0.233 |
1/4 | F (0.257) | 0.250 | 0.265 |
9/32 | L (0.290) | 0.281 | 0.296 |
5/16 | 0 (0.316) | 0.312 | 0.327 |
11/32 | S (0.348) | 0.343 | 0.358 |
3/8 | V (0.377) | 0.375 | 0.390 |
13/32 | Z (0.413) | 0.406 | 0.421 |
Rivet Shank Unbucked Nominal Diameter |
Minimum Manufactured Head Height (inches) |
---|---|
1/16 | 0.022 |
3/32 | 0.032 |
1/8 | 0.042 |
5/32 | 0.052 |
3/16 | 0.062 |
7/32 ** | 0.072 |
1/4 | 0.083 |
9/32 ** | 0.093 |
5/16 | 0.104 |
11/32 ** | 0.114 |
3/8 | 0.125 |
13/32 ** | 0.135 |
** Indicates oversize replacements
Rivet Shank Unbucked Nominal Diameter |
Minimum Driven Head Diameter (inches) | Driven Head Thickness (inches) | |
---|---|---|---|
Minimum | Maximum | ||
1/16 | 0.081 | 0.025 | 0.040 |
3/32 | 0.122 | 0.038 | 0.050 |
1/8 | 0.163 | 0.050 | 0.070 |
5/32 | 0.203 | 0.062 | 0.092 |
3/16 | 0.244 | 0.075 | 0.105 |
7/32 ** | 0.285 | 0.087 | 0.110 |
1/4 | 0.325 | 0.100 | 0.130 |
9/32 ** | 0.365 | 0.113 | 0.140 |
5/16 | 0.406 | 0.125 | 0.158 |
11/32 ** | 0.450 | 0.137 | 0.170 |
3/8 | 0.488 | 0.150 | 0.190 |
13/32 ** | 0.530 | 0.165 | 0.200 |
** Indicates oversize replacements
Nominal Rivet Diameter | 1/16 | 3/32 | 1/8 | 5/32 | 3/16 | 7/32 | 1/4 | 9/32 | 5/16 | 11/32 | 3/8 | 13/32 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum Head Protrusion Prior to Shaving ("H") | 0.005 | 0.006 | 0.007 | 0.009 | 0.010 | 0.011 | 0.012 | 0.013 | 0.014 | 0.015 | 0.016 | 0.017 |
Minimum Head Diameter After Shaving ("D") | 0.095 | 0.161 | 0.204 | 0.262 | 0.326 | 0.383 | 0.443 | 0.490 | 0.526 | 0.588 | 0.650 | 0.712 |
Nominal Rivet Diameter | 1/16 | 3/32 | 1/8 | 5/32 | 3/16 | 7/32 | 1/4 | 9/32 | 5/16 | 11/32 | 3/8 | 13/32 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Cutter Diameter | 3/8 | 3/8 | 3/8 | 3/8 | 7/16 | 1/2 | 9/16 | 9/16 | 5/8 | 5/8 | 3/4 | 3/4 |
Nominal Rivet Diameter | 1/16 | 3/32 | 1/8 | 5/32 | 3/16 | 7/32 | 1/4 | 9/32 | 5/16 | 11/32 | 3/8 | 13/32 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Countersink Diameter | 0.110 | 0.176 | 0.222 | 0.284 | 0.351 | 0.411 | 0.474 | 0.522 | 0.560 | 0.625 | 0.690 | 0.756 |
Rivet Diameter (inches) | Dimpled Countersunk Rivets | Machine Countersunk Rivets | Universal Head Rivets |
---|---|---|---|
1/16 | 0.375 | 0.313 | 0.250 |
3/32 | 0.563 | 0.438 | 0.375 |
1/8 | 0.625 | 0.531 | 0.500 |
5/32 | 0.688 | 0.625 | 0.563 |
3/16 | 0.750 | 0.750 | 0.688 |
7/32 ** | 0.875 | 0.875 | 0.0781 |
1/4 | 0.938 | 1.375 | 0.875 |
9/32 ** | 1.125 | 1.125 | 1.000 |
5/16 | 1.250 | 1.250 | 1.125 |
11/32 | 1.375 | 1.375 | 1.250 |
3/8 | 1.500 | 1.500 | 1.344 |
13/32 ** | 1.625 | 1.625 | 1.469 |
** indicates sizes normally used for oversize replacement only
Lesser minimum spacings require government design activity approval unless otherwise indicated on the drawing.
Rivet Diameter (inches) | Minimum A and B |
Minimum C and D |
---|---|---|
1/16 | 0.094 | 0.156 |
3/32 | 0.156 | 0.219 |
1/8 | 0.219 | 0.281 |
5/32 | 0.281 | 0.344 |
3/16 | 0.344 | 0.375 |
7/32 ** | 0.406 | 0.438 |
1/4 | 0.438 | 0.500 |
9/32 ** | 0.500 | 0.563 |
5/16 | 0.563 | 0.625 |
11/32 | 0.625 | 0.688 |
3/8 | 0.688 | 0.750 |
13/32 ** | 0.750 | 0.812 |
** indicates sizes normally used for oversize replacement only
Lesser minimum spacings require government design activity approval unless otherwise indicated on the drawing (see Figure 2).
Typical Examples of Unacceptable Rivets
Minimum Edge Margins
Special Considerations
Provide a minimum
of .03" between the edge of non-flush rivet heads (Nos. 1 or
2) and bend radius tangent point. Otherwise, maintain the normal edge distances,
both visible and invisible.
When the design calls for crimped sheet edges in conjunction with dimpled holes, add .06" to values indicated for flush rivets. This is to provide clearance for the crimping tool.