Rivet Application Tables and Installation Practice per. MIL-R-47196

General Engineering Reviews | Engineering Applications and Design

MIL-R-47196A, MILITARY SPECIFICATION: RIVETS, BUCK TYPE, PREPARATION FOR AND INSTALLATION OF (06-SEP-1977) [S/S BY NASM47196]. , This specification covers the preparation for and installation of buck rivets.

Rivet Installation.

     Drilling Rivet holes should be drilled in accordance with the following recommendations
          a. All holes shall be drilled normal (at 90 degrees) to the working surface.
          b. Extreme pressure shall not be applied and holes shall not be punched through with the drill.
          c. When drilling through more than one sheet, hold the sheets securely together so there is no misalignment of holes due to shifting or separation of the sheets.

Piercing Only piercing tools which produce-true and clean holes, equivalent to acceptable drilled holes should be used.  If piercing is used, all holes need be inspected for radial cracking.

Mating surfaces should be cleaned before parts are riveted together, all chips, burrs and foreign material must be removed from the mating surfaces. Burrs may be removed from rivet holes by chamfering to a depth not to exceed 10 percent of the stock thickness, or 0.032 inch, whichever is less.

    Oversize countersinks: When countersinks are enlarged beyond specified tolerances, the next larger size rivet may be used, provided pitch and edge margin design requirements are maintained.  The term "next larger size" shall be defined as the next larger diameter for the application, but not to exceed 1/32 inch increments for sizes up to 1/4 inch diameter and 1/16 inch increments for sizes above 1/4 inch.

    Repair limitations: The combined oversize rivet hole repairs and oversize countersink repairs should be limited to a maximum of 20 percent of the rivets, or 10 rivets in a single rivet pattern, whichever is less. Repairs to more than two adjacent oversize rivets, or replacing more than half the rivets with oversize rivets in any 10 inch length of pattern is prohibited.

TABLE I

Hole Size, Standard Rivets

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

 

TABLE II

Minimum Flattened Dimension of Manufactured Rivet Heads
(Universal Type)

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

TABLE III

Standard Flat Driven Head Dimensions

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

 

TABLE IV
Required Dimensions for Rivet Shaving (inches)

 
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

 

TABLE V

Rivet Shaver Cutter Diameters (inches)

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

 

TABLE VI

Countersink Diameters (inches)

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
TABLE VII

Minimum Pitch (inches)
(for repair using oversize rivets only)

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

TABLE VIII

Minimum Edge Margins (inches)

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

Typical Examples of Unacceptable Rivets

 

 

FIGURE 2

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.

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