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Hexagon Socket Countersunk Head Screws - Unified Thread

BS 2470 - 1973

Display drawing:

Screw Thread
d

d_s	max
d_s	min
d_k	max
d_k	min
s	Nominal Size
t	min
b	min
k	Ref.

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1640
0.0568	0.0695	0.0822	0.0949	0.1075	0.1202	0.1329	0.1585
0.138	0.168	0.197	0.226	0.255	0.281	0.307	0.359
0.117	0.143	0.168	0.193	0.218	0.240	0.263	0.311
0.035	0.050	0.050	1/16	1/16	5/64	5/64	3/32
0.025	0.031	0.038	0.044	0.055	0.061	0.066	0.076
0.500	0.625	0.625	0.625	0.750	0.750	0.750	0.875
0.046	0.057	0.066	0.075	0.085	0.093	0.1	0.116

Screw Thread
d

10#

1/4

5/16

3/8

7/16

1/2

5/8

3/4

d_s	max
d_s	min
d_k	max
d_k	min
s	Nominal Size
t	min
b	min
k	Ref.

0.1900	0.2500	0.3125	0.3750	0.4375	0.5000	0.6250	0.7500
0.1840	0.2435	0.3053	0.3678	0.4294	0.4919	0.6163	0.7406
0.411	0.531	0.656	0.781	0.844	0.937	1.188	1.438
0.359	0.476	0.589	0.704	0.755	0.857	1.065	1.293
1/8	5/32	3/16	7/32	1/4	5/16	3/8	1/2
0.087	0.111	0.135	0.159	0.159	0.172	0.220	0.220
0.875	1.000	1.125	1.250	1.375	1.500	1.750	2.000
0.131	0.167	0.205	0.241	0.242	0.260	0.335	0.41

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18	[NF] NF E 25-146 - 2004	Hexagon Socket Countersunk Head Screws
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