Click Specification

Cross recessed round head screws

ASME B 18.6.3 (T36-I/T36-IA) - 2013

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Thread Size
d

10#

12#

14#

d
PP
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min
d_k	max
	min
k	max
	min

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420
80	64	56	48	40	40	32	/	32	24	24	/
0	0	1	1	1	2	2	2	2	2	3	3
0.066	0.075	0.093	0.102	0.111	0.147	0.155	0.164	0.171	0.188	0.242	0.258
/	/	0.092	/	0.110	0.142	0.150	/	0.164	0.182	0.234	/
0.035	0.045	0.046	0.055	0.065	0.063	0.073	0.081	0.090	0.108	0.108	0.125
0.015	0.026	0.027	0.035	0.046	0.035	0.045	0.055	0.064	0.082	0.082	0.099
/	/	0.047	/	0.067	0.063	0.071	/	0.086	0.105	0.103	/
/	/	0.031	/	0.051	0.045	0.053	/	0.068	0.087	0.085	/
0.113	0.138	0.162	0.187	0.211	0.236	0.260	0.285	0.309	0.359	0.408	0.457
0.099	0.122	0.146	0.169	0.193	0.217	0.240	0.264	0.287	0.334	0.382	0.429
0.053	0.061	0.069	0.078	0.086	0.095	0.103	0.111	0.120	0.137	0.153	0.170
0.043	0.051	0.059	0.067	0.075	0.083	0.091	0.099	0.107	0.123	0.139	0.155

Thread Size
d

1/4

16#

18#

5/16

20#

24#

3/8

7/16

1/2

9/16

5/8

3/4

d
PP
Socket No.
M₁	Ref.
M₂	Ref.
P	Type I	max
		min
	Type IA	max
		min
d_k	max
	min
k	max
	min

0.2500	0.2680	0.2940	0.3125	0.3200	0.3720	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
20	/	/	18	/	/	16	14	13	12	11	10
3	3	4	3	4	4	4	4	4	4	5	5
0.261	0.274	0.322	0.301	0.338	0.380	0.380	0.395	0.409	0.447	0.542	0.642
0.255	/	/	0.291	/	/	0.368	/	/	/	/	/
0.130	0.142	0.147	0.170	0.163	0.208	0.208	0.221	0.236	0.272	0.285	0.385
0.104	0.119	0.121	0.144	0.137	0.182	0.182	0.196	0.211	0.245	0.244	0.346
0.126	/	/	0.162	/	/	0.195	/	/	/	/	/
0.108	/	/	0.144	/	/	0.177	/	/	/	/	/
0.472	0.506	0.555	0.590	0.604	0.702	0.708	0.750	0.813	0.938	1.000	1.250
0.443	0.476	0.523	0.557	0.570	0.664	0.670	0.707	0.766	0.887	0.944	1.185
0.175	0.187	0.204	0.216	0.220	0.254	0.256	0.328	0.355	0.410	0.438	0.547
0.160	0.171	0.187	0.198	0.203	0.235	0.237	0.307	0.332	0.385	0.411	0.516

①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging depth on finished fasteners due to the buildup of plating in the recesses. The recess penetration dimensions specified here are for finished (plated ) product. Manufacturers should be advised that they should not use all this tolerance in the heading process, or an out-of-tolerance condition could exist after plating.
③,Sizes 9/16, 5/8, and 3/4, are for machine screws only.
④,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only.

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