Click Specification

(Non-preferred) dimensions in parentheses.

Cross Recessed Pan Head Machine Screws

BS 1981 - 1991

Display drawing:

Screw Thread
d

(3#)

10#

(12#)

1/4

5/16

3/8

7/16

1/2

d_k	max
	min
k	max
	min
Socket No.
m	Nominal Size
Penetration depth	max
	min

0.167	0.193	0.219	0.245	0.270	0.322	0.373	0.425	0.492	0.615	0.740	0.863	0.987
0.155	0.180	0.205	0.231	0.256	0306	0.357	0.407	0.473	0.594	0.716	0.838	0.958
0.062	0.071	0.080	0.089	0.097	0.115	0.133	0.151	0.175	0.218	0.261	0.304	0.348
0.053	0.062	0.070	0.079	0.087	0.105	0.122	0.139	0.162	0.203	0.244	0.286	0.327
1	1	1	2	2	2	2	3	3	4	4	4	4
0.096	0.104	0.114	0.146	0.154	0.169	0.185	0.246	0.265	0.333	0.369	0.392	0.412
0.053	0.062	0.072	0.068	0.076	0.092	0.108	0.117	0.137	0.164	0.201	0.224	0.246
0.043	0.052	0.062	0.050	0.058	0.074	0.09	0.099	0.119	0.146	0.183	0.206	0.228

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