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Cheese head screws with hexalobular slot

ASME B 18.6.3 (T22-VI) - 2013

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Thread Size
d

10#

12#

d	Nominal Size
PP
Socket No.
M	Ref.
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
56	48	40	40	32	/	32	24	24
T6	T8	T10	T10	T15	T15	T20	T25	T27
0.069	0.094	0.101	0.111	0.132	0.132	0.155	0.178	0.200
0.030	0.040	0.040	0.055	0.055	0.060	0.071	0.090	0.090
0.025	0.035	0.030	0.045	0.045	0.050	0.055	0.070	0.070
0.140	0.161	0.183	0.205	0.226	0.248	0.270	0.313	0.357
0.124	0.145	0.166	0.187	0.208	0.229	0.250	0.292	0.334
0.062	0.070	0.079	0.088	0.096	0.105	0.113	0.130	0.148
0.053	0.061	0.069	0.078	0.086	0.094	0.102	0.118	0.134
0.083	0.095	0.107	0.120	0.132	0.144	0.156	0.180	0.205
0.066	0.077	0.088	0.100	0.111	0.122	0.133	0.156	0.178

Thread Size
d

14#

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

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

0.2420	0.2500	0.3125	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
/	20	18	16	14	13	12	11	10
T27	T30	T40	T45	T50	T55	T55	T60	T70
0.221	0.221	0.266	0.312	0.352	0.446	0.446	0.529	0.619
0.090	0.120	0.125	0.155	0.169	0.190	0.190	0.230	0.295
0.070	0.100	0.105	0.135	0.149	0.170	0.170	0.210	0.275
0.400	0.414	0.518	0.622	0.625	0.750	0.812	0.875	1.000
0.376	0.389	0.490	0.590	0.589	0.710	0.768	0.827	0.945
0.165	0.170	0.211	0.253	0.265	0.297	0.336	0.375	0.441
0.151	0.155	0.194	0.233	0.242	0.273	0.308	0.345	0.406
0.230	0.237	0.295	0.355	0.368	0.412	0.466	0.521	0.612
0.201	0.207	0.262	0.315	0.321	0.362	0.410	0.461	0.542

①,Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
②,Sizes 9/16, 5/8, and 3/4 are for machine screws only.
③,Sizes 7 and 14 are for tapping screws only.

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