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Square Recessed Raised Cheese Head Machine Screws

ASME B 18.6.3 (T22-III) - 2013

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Thread Size
d

10#

12#

14#

1/4

5/16

3/8

d	Nominal Size
PP
Socket No.
M
P	max
	min
d_k	max
	min
k₁	max
	min
k	max
	min

0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500	0.3125	0.3750
56	48	40	40	32	/	32	24	24	/	20	18	16
00	0	0	1R	1R	1R	2R	2R	3R	3R	3R	4R	4R
0.050	0.070	0.070	0.091	0.091	0.091	0.112	0.112	0.133	0.133	0.133	0.191	0.191
0.033	0.038	0.038	0.065	0.065	0.065	0.075	0.075	0.095	0.095	0.095	0.100	0.100
0.028	0.028	0.028	0.050	0.050	0.050	0.060	0.060	0.080	0.080	0.080	0.085	0.085
0.140	0.161	0.183	0.205	0.226	0.248	0.270	0.313	0.357	0.400	0.414	0.518	0.622
0.124	0.145	0.166	0.187	0.208	0.229	0.250	0.292	0.334	0.376	0.389	0.490	0.590
0.062	0.070	0.079	0.088	0.096	0.105	0.113	0.130	0.148	0.165	0.170	0.211	0.253
0.053	0.061	0.069	0.078	0.086	0.094	0.102	0.118	0.134	0.151	0.155	0.194	0.233
0.083	0.095	0.107	0.120	0.132	0.144	0.156	0.180	0.205	0.230	0.237	0.295	0.355
0.066	0.077	0.088	0.100	0.111	0.122	0.133	0.156	0.178	0.201	0.207	0.262	0.315

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 build up 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,“R" in the recess size tabulation means regular depth recess.
④,Sizes 7 and 14 are for tapping screws only.

Alternative history

ANSI/ASME B 18.6.3 - 2010 ASME B 18.6.3T22-III - 2013

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Similar Standards

[ASME/ANSI]
ASME/ANSI B 18.6.3 - 2010

Square Recessed Raised Cheese Head Machine Screws