Click Specification

Spline socket button head cap screws

ASME/ANSI B 18.3 - 2003

Display drawing:

Screw Thread
d

10#

1/4

5/16

3/8

1/2

5/8

d	Nominal Diameter
PP	UNC
	UNF
	UNEF
d_k	max
d_k	min
k	max
k	min
A	Nominal Size
t	min
L	max

0.060	0.073	0.086	0.099	0.112	0.125	0.138	0.164	0.190	0.250	0.313	0.375	0.500	0.625
-	64.0	56.0	48.0	40.0	40.0	32.0	32.0	24.0	20.0	18.0	16.0	13.0	11.0
80.0	72.0	64.0	56.0	48.0	44.0	40.0	36.0	32.0	28.0	24.0	24.0	20.0	18.0
-	-	-	-	-	-	-	-	-	32.0	32.0	32.0	28.0	24.0
0.114	0.139	0.164	0.188	0.213	0.238	0.262	0.312	0.361	0.437	0.547	0.656	0.875	1.000
0.104	0.129	0.154	0.176	0.201	0.226	0.250	0.298	0.347	0.419	0.527	0.636	0.851	0.970
0.032	0.039	0.046	0.052	0.059	0.066	0.073	0.087	0.101	0.132	0.166	0.199	0.265	0.331
0.026	0.033	0.038	0.044	0.051	0.058	0.063	0.077	0.091	0.122	0.152	0.185	0.245	0.311
0.048	0.060	0.060	0.072	0.072	0.096	0.096	0.111	0.145	0.183	0.216	0.251	0.372	0.454
0.020	0.028	0.028	0.035	0.035	0.044	0.044	0.052	0.070	0.087	0.105	0.122	0.175	0.210
0.50	0.50	0.50	0.50	0.50	0.50	0.63	0.75	1.00	1.00	1.00	1.25	2.00	2.00

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