Click Specification

Square recessed round head screws

ASME B 18.6.3 (T36-III) - 2013

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Thread Size
d

10#

12#

d
PP
Socket No.
M	Ref.
P	max
	min
d_k	max
	min
k	max
	min

0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160
48	40	40	32	/	32	24	24
0	0	1R	1R	1R	2R	2R	3R
0.070	0.070	0.091	0.091	0.091	0.112	0.112	0.133
0.038	0.038	0.065	0.065	0.065	0.075	0.075	0.095
0.028	0.028	0.050	0.050	0.050	0.060	0.060	0.080
0.187	0.211	0.236	0.260	0.285	0.309	0.359	0.408
0.169	0.193	0.217	0.240	0.264	0.287	0.334	0.382
0.078	0.086	0.095	0.103	0.111	0.120	0.137	0.153
0.067	0.075	0.083	0.091	0.099	0.107	0.123	0.139

Thread Size
d

14#

1/4

16#

18#

5/16

20#

24#

3/8

d
PP
Socket No.
M	Ref.
P	max
	min
d_k	max
	min
k	max
	min

0.2420	0.2500	0.2680	0.2940	0.3125	0.3200	0.3720	0.3750
/	20	/	/	18	/	/	16
3R	3R	3R	4R	4R	4R	4R	4R
0.133	0.133	0.133	0.191	0.191	0.191	0.191	0.191
0.095	0.095	0.095	0.100	0.100	0.100	0.100	0.100
0.080	0.080	0.080	0.085	0.085	0.085	0.085	0.085
0.457	0.472	0.506	0.555	0.590	0.604	0.702	0.708
0.429	0.443	0.476	0.523	0.557	0.570	0.664	0.670
0.170	0.175	0.187	0.204	0.216	0.220	0.254	0.256
0.155	0.160	0.171	0.187	0.198	0.203	0.235	0.237

①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,"R" in the recess size tabulation means regular depth recess.
③,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.
④,Sizes 7, 14, 16, 18, 20, and 24 are for tapping screws only.

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