Click Specification

Hexalobular socket raised countersunk head screws - Type VI [Table 7&8]

ASME B 18.6.3 (T8-VI) - 2013

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Thread Size
d

10#

12#

14#

1/4

d	Nominal Size
L
d_k	max
d_k	min
k	Ref.
f	Ref.
M	Ref.
P	max
P	min
Socket No.
α	max
α	min

0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500
1/8	1/8	3/16	3/16	3/16	/	1/4	5/16	3/8	/	7/16
0.162	0.187	0.212	0.237	0.262	0.287	0.312	0.362	0.412	0.462	0.477
0.144	0.167	0.191	0.215	0.238	0.262	0.285	0.333	0.380	0.427	0.442
0.051	0.059	0.067	0.075	0.083	0.091	0.100	0.116	0.132	0.148	0.153
0.029	0.033	0.037	0.041	0.045	0.049	0.052	0.060	0.068	0.076	0.079
0.069	0.094	0.094	0.111	0.132	0.132	0.155	0.178	0.200	0.221	0.221
0.022	0.025	0.033	0.055	0.055	0.060	0.071	0.090	0.090	0.095	0.105
0.017	0.022	0.028	0.045	0.045	0.050	0.055	0.070	0.070	0.075	0.085
T6	T8	T8	T10	T15	T15	T20	T25	T27	T30	T30
82°	82°	82°	82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°	80°	80°	80°

Thread Size
d

16#

18#

5/16

20#

24#

3/8

7/16

1/2

9/16

5/8

3/4

d	Nominal Size
L
d_k	max
d_k	min
k	Ref.
f	Ref.
M	Ref.
P	max
P	min
Socket No.
α	max
α	min

0.2680	0.2940	0.3125	0.3200	0.3720	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
/	/	1/2	/	/	9/16	5/8	3/4	/	/	/
0.512	0.561	0.597	0.611	0.711	0.717	0.760	0.815	0.932	1.050	1.285
0.475	0.522	0.556	0.569	0.664	0.670	0.715	0.765	0.878	0.990	1.215
0.164	0.180	0.191	0.196	0.228	0.230	0.223	0.223	0.260	0.298	0.372
0.084	0.092	0.099	0.100	0.116	0.117	0.122	0.131	0.150	0.169	0.206
0.221	0.266	0.266	0.266	0.312	0.312	0.352	0.352	0.446	0.446	0.529
0.115	0.115	0.125	0.130	0.155	0.155	0.150	0.169	0.190	0.190	0.230
0.095	0.095	0.105	0.110	0.130	0.130	0.130	0.150	0.165	0.165	0.210
T30	T40	T40	T40	T45	T45	T50	T50	T55	T55	T60
82°	82°	82°	82°	82°	82°	82°	82°	82°	82°	82°
80°	80°	80°	80°	80°	80°	80°	80°	80°	80°	80°

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, 14, 16, 18, 20, and 24 are for tapping screws only.
④,Machine Screw Length of Thread 1) Sizes No.5 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 1-1/8 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full-form thread of 1 in. 2) Sizes No.6 and smaller. Screws of nominal lengths equal to three diameters and shorter shall have full-form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practicable. Nominal lengths greater than three diameters, up to and including 2 in., shall have full-form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall have a minimum length of full-form thread of 1.5 in. unless otherwise specified.

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Similar Standards

1	[JIS] JIS B 1107 - 2004	Hexalobular Socket Raised Countersunk Head Screws View Suppliers
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