Oval & Truss Head Standards
Explore our oval and truss head standards to help you find the right fit for your application.
Product Specs
When length is more than 8 times the body diameter more length tolerance is needed. (All dimensions shown in inches.)
Truss or Oval Head Style
Body Diameter (A)
Head Diameter (B)
Head Thickness (C)
Length Tolerance
Taper Hole Diameter D-1
Taper Hole Diameter D-2
Hole Depth (E)
Straight Hole Diameter D-3
Hole Depth Tolerance
Under-Head Radius (F)
Work Hole Diameter
Clinch Allowance
AAA-1
Oval
.046/.049
.080.003
.012.002
.003
.031
.036
.035
.035
.003
.003
.052
.028
AA-1
Oval
.058/.061
.109.005
.017.002
.006
.039
.045
.043
.043
.006
.005
.064
.037
AA-2
Truss
.058/.061
.125.005
.017.002
.006
.039
.045
.043
.043
.006
.005
.064
.037
AB-1
Oval
.085/.089
.147.005
.023.003
.008
.058
.067
.064
.064
.008
.010
.096
.054
AB-8
Truss
.085/.089
.187.005
.023.003
.008
.058
.067
.064
.064
.008
.012
.096
.054
BC-1
Oval
.095/.099
.187.005
.029.003
.008
.065
.075
.071
.071
.008
.012
.107
.060
C-1
Oval
.118/.123
.218.005
.034.004
.010
.080
.093
.089
.089
.010
.015
.129
.074
C-4
Truss
.118/.123
.281.005
.034.004
.010
.080
.093
.089
.089
.010
.015
.129
.074
C-7
Oval
.118/.123
.250.005
.034.004
.010
.080
.093
.089
.089
.010
.015
.129
.074
D-1
Oval
.141/.146
.234.005
.042.004
.010
.096
.111
.106
.106
.010
.020
.156
.088
D-3
Truss
.141/.146
.312.005
.042.004
.010
.096
.111
.106
.106
.010
.020
.156
.088
D-22
Oval
.141/.146
.250.005
.046.004
.010
.096
.111
.106
.106
.010
.020
.156
.088
DF-9
Truss
.150/.156
.375.005
.062.004
.010
.102
.118
.113
.113
.010
.020
.166
.097
DF-11
Oval
.150/.156
.312.005
.046.004
.010
.102
.118
.113
.113
.010
.020
.166
.097
E-1
Oval
.182/.188
.312.005
.062.004
.010
.124
.143
.137
.137
.010
.025
.199
.122
E-3
Truss
.182/.188
.375.006
.062.004
.010
.124
.143
.137
.137
.010
.025
.199
.122
E-5
Truss
.182/.188
.500.010
.062.005
.010
.124
.143
.137
.137
.010
.025
.199
.122
G-1
Truss
.244/.252
.500.010
.098.005
.010
.166
.192
.183
.182
.015
.030
.265
.164
G-4
Oval
.244/.252
.437.010
.078.005
.010
.166
.192
.183
.182
.015
.030
.265
.164
G-11
Truss
.244/.252
.500.010
.078.005
.010
.166
.192
.183
.182
.015
.030
.265
.164
T-2
Oval
.302/.310
.562.010
.093.005
.015
.205
.237
.227
.227
.015
.030
.332
.203
National Rivet Part Numbers
Part No. C1-10-ST: C1=Rivet Style (with straight hole), 10 = length in 32nds (10/32 or 5/16 long), ST=semi-tubular.
Part No. TC1-10-ST: The prefix “T” before the style No. (C1) indicates rivet with taper hole.
Note: Aluminum, stainless, and brass rivets should normally be specified with taper holes.
Taper Hole
Straight Hole
Determining Length and Diameter
Example: To determine the length of a 1/8″ diameter (C1 style) rivet for two parts each of which are .093″ thick.
- Total work thickness (2x.093″) . . . . . . .186
- Clinch allowance (for C1) . . . . . . . . .074
- Total . . . . . . . . . . . . . . . . . . . . . . . . . . .260
- Rivet length (nearest fraction) = .265 17/64″
Note: Variations in materials or conditions of assembly may require deviations from the above. To be sure, submit sample parts for test assembly.
Other Popular Head Styles
Flat Countersunk
Flat Chamfered Countersunk
Universal
