ANSI/ASME B 18.3 - 2003 Spline socket flat countersunk head cap screws


Unit: inch
Nominal Length L Tips:seclect Nominal Length L and get Thread length.
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 8#
d Nominal Diameter
PP UNC
UNF
UNEF
ds max
min
dk Theo.Sharp Max
Abs. Min
k Ref
A Nominal Size
t min
b min
0.060 0.073 0.086 0.099 0.112 0.125 0.138 0.164
- 64.0 56.0 48.0 40.0 40.0 32.0 32.0
80.0 72.0 64.0 56.0 48.0 44.0 40.0 36.0
- - - - - - - -
0.060 0.073 0.086 0.099 0.112 0.125 0.138 0.164
0.0568 0.0695 0.0822 0.0949 0.1075 0.1202 0.1329 0.1585
0.138 0.168 0.197 0.226 0.255 0.281 0.307 0.359
0.117 0.143 0.168 0.193 0.218 0.240 0.263 0.311
0.044 0.054 0.064 0.073 0.083 0.090 0.097 0.112
0.048 0.060 0.060 0.072 0.072 0.096 0.096 0.111
0.025 0.031 0.038 0.044 0.055 0.061 0.066 0.076
0.50 0.62 0.62 0.62 0.75 0.75 0.75 0.88
Length of Thread b
- - - - - - - -
Screw Thread
d
10# 1/4 5/16 3/8 7/16 1/2 5/8 3/4
d Nominal Diameter
PP UNC
UNF
UNEF
ds max
min
dk Theo.Sharp Max
Abs. Min
k Ref
A Nominal Size
t min
b min
0.190 0.250 0.313 0.375 0.438 0.500 0.625 0.750
24.0 20.0 18.0 16.0 14.0 13.0 11.0 10.0
32.0 28.0 24.0 24.0 20.0 20.0 18.0 16.0
- 32.0 32.0 32.0 28.0 28.0 24.0 20.0
0.019 0.250 0.313 0.375 0.438 0.500 0.625 0.750
0.1840 0.2435 0.3053 0.3678 0.4294 0.4919 0.6163 0.7406
0.411 0.531 0.656 0.781 0.844 0.938 1.188 1.438
0.359 0.480 0.600 0.720 0.781 0.872 1.112 1.355
0.127 0.161 0.198 0.234 0.234 0.251 0.324 0.396
0.145 0.183 0.216 0.251 0.291 0.372 0.454 0.454
0.087 0.111 0.135 0.159 0.159 0.172 0.220 0.220
0.88 1.00 1.12 1.25 1.38 1.50 1.75 2.00
Length of Thread b
- - - - - - - -
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