Click Specification

(Non-preferred) dimensions in parentheses.

Slotted Raised Countersunk Head Machine Screws

BS 1981 - 1991

Display drawing:

Screw Thread
d

(1#)

(3#)

10#

(12#)

1/4

5/16

3/8

b	max
d_k	max
	min
k
n	max
	min
t	max
	min

1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75	1.75
0.119	0.146	0.172	0.199	0.225	0.252	0.279	0.332	0.385	0.438	0.507	0.635	0.762
0.099	0.123	0.147	0.171	0.195	0.22	0.244	0.292	0.34	0.389	0.452	0.568	0.685
0.035	0.043	0.051	0.059	0.067	0.075	0.083	0.1	0.116	0.132	0.153	0.191	0.23
0.023	0.026	0.031	0.035	0.039	0.043	0.048	0.054	0.06	0.067	0.075	0.084	0.094
0.016	0.019	0.023	0.027	0.031	0.035	0.039	0.045	0.05	0.056	0.064	0.072	0.081
0.03	0.038	0.045	0.052	0.059	0.067	0.074	0.088	0.103	0.117	0.136	0.171	0.206
0.025	0.031	0.037	0.043	0.049	0.055	0.06	0.072	0.084	0.096	0.112	0.141	0.17

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