Click Specification

82° Hexalobular Socket Countersunk Flat Head Screws

ASME B 18.6.3 (T2-VI) - 2013

Display drawing:

Download CAD Model

Thread Size
d

10#

12#

14#

1/4

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

0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1510	0.1640	0.1900	0.2160	0.2420	0.2500
64	56	48	40	40	32	/	32	24	24	/	20
0.137	0.162	0.187	0.212	0.237	0.262	0.287	0.312	0.362	0.412	0.462	0.477
0.120	0.144	0.167	0.191	0.215	0.238	0.262	0.285	0.333	0.380	0.427	0.442
0.043	0.051	0.059	0.067	0.075	0.083	0.091	0.100	0.116	0.132	0.148	0.153
0.058	0.069	0.094	0.094	0.111	0.111	0.132	0.132	0.155	0.178	0.200	0.200
0.017	0.022	0.025	0.033	0.045	0.045	0.045	0.051	0.065	0.070	0.080	0.090
0.012	0.017	0.020	0.028	0.035	0.035	0.035	0.040	0.050	0.055	0.065	0.075
T5	T6	T8	T8	T10	T10	T15	T15	T20	T25	T27	T27
82°	82°	82°	82°	82°	82°	82°	82°	82°	82°	82°	82°
80°	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
PP
d_k	max
d_k	min
k	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
/	/	18	/	/	16	14	13	12	11	10
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
0.221	0.221	0.266	0.266	0.266	0.266	0.352	0.352	0.446	0.446	0.529
0.070	0.090	0.105	0.115	0.125	0.135	0.125	0.135	0.160	0.160	0.230
0.055	0.075	0.087	0.095	0.105	0.115	0.105	0.120	0.140	0.140	0.205
T30	T30	T40	T40	T40	T40	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.

Send Inquiry

Similar Standards

1	[ISO] ISO 14581 - 2013	Fasteners — Hexalobular Socket Countersunk Flat Head Screws View Suppliers
2	[GB] GB /T 2673 - 2007	Hexalobular Lobular Socket Countersunk Head Screws View Suppliers
3	[GB] GB /T 2673.1 - 2018	Hexalobular Socket Countersunk Flat Head Screws View Suppliers
4	[GB] GB 2673 - 1986	Hexagon lobular socket countersunk head screws View Suppliers
5	[ISO] ISO 14582 - 2013	Hexalobular Socket Countersunk Head Screws, High Head
6	[NF] NF E 25-107 - 2007	Screws With Six Lobes Recessed Countersunk Head - Symbol FX
7	[GB] GB /T 2673.2 - 2020	Hexalobular Socket High Countersunk Head Screws
8	[ASTM] ASTM 18.3 (Table 8-III) - 2012	Hexagon Socket Flat Countersunk Head Cap