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Cross recessed round head screws

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

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Thread Size
d

10#

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	0.1640	0.1900
80	64	56	48	40	40	32	32	24
0	0	1	1	1	2	2	2	2
0.066	0.075	0.093	0.102	0.111	0.147	0.155	0.171	0.188
/	/	0.092	/	0.110	0.142	0.150	0.164	0.182
0.035	0.045	0.046	0.055	0.065	0.063	0.073	0.090	0.108
0.015	0.026	0.027	0.035	0.046	0.035	0.045	0.064	0.082
/	/	0.047	/	0.067	0.063	0.071	0.086	0.105
/	/	0.031	/	0.051	0.045	0.053	0.068	0.087
0.113	0.138	0.162	0.187	0.211	0.236	0.260	0.309	0.359
0.099	0.122	0.146	0.169	0.193	0.217	0.240	0.287	0.334
0.053	0.061	0.069	0.078	0.086	0.095	0.103	0.120	0.137
0.043	0.051	0.059	0.067	0.075	0.083	0.091	0.107	0.123

Thread Size
d

12#

1/4

5/16

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

0.2160	0.2500	0.3125	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
24	20	18	16	14	13	12	11	10
3	3	3	4	4	4	4	5	5
0.242	0.261	0.301	0.380	0.395	0.409	0.447	0.542	0.642
0.234	0.255	0.291	0.368	/	/	/	/	/
0.108	0.130	0.170	0.208	0.221	0.236	0.272	0.285	0.385
0.082	0.104	0.144	0.182	0.196	0.211	0.245	0.244	0.346
0.103	0.126	0.162	0.195	/	/	/	/	/
0.085	0.108	0.144	0.177	/	/	/	/	/
0.408	0.472	0.590	0.708	0.750	0.813	0.938	1.000	1.250
0.382	0.443	0.557	0.670	0.707	0.766	0.887	0.944	1.185
0.153	0.175	0.216	0.256	0.328	0.355	0.410	0.438	0.547
0.139	0.160	0.198	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.

Alternative history

ASME B 18.6.3T36-I/T36-IA - 2013 ASME B 18.6.3H11B-I/H11B-IA - 2024

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Similar Standards

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11	[GOST] GOST 17473 - 1980	Half-rounded head screws, product grades A and B
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