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(Non-preferred) dimensions in parentheses.

Square Head Bolt with B.S.Threads [Table 1]

BS 916 - 1953

Display drawing:

Thread Size
d

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

7/8

PP	No. of Threads/Inch	BSW
d_s	max
s	max
	min
e	max
R	max
k	max
	min

20	18	16	14	12	12	11	10	9
0.280	0.342	0.405	0.468	0.530	0.592	0.665	0.790	0.915
0.445	0.525	0.600	0.710	0.820	0.920	1.010	1.200	1.300
0.435	0.515	0.585	0.695	0.800	0.900	0.985	1.175	1.270
0.63	0.74	0.85	1.00	1.16	1.30	1.43	1.70	1.84
1/32	1/32	1/32	1/32	1/32	3/64	3/64	3/64	1/16
0.186	0.228	0.270	0.312	0.363	0.405	0.447	0.530	0.623
0.166	0.208	0.250	0.292	0.333	0.375	0.417	0.500	0.583

Thread Size
d

1-1/8

1-1/4

(1-3/8)

1-1/2

(1-5/8)

1-3/4

PP	No. of Threads/Inch	BSW
d_s	max
s	max
	min
e	max
R	max
k	max
	min

8	7	7	6	6	5	5	4.5
1.040	1.175	1.300	1.425	1.550	1.685	1.810	2.060
1.480	1.670	1.860	2.050	2.220	2.410	2.580	2.760
1.450	1.640	1.815	2.005	2.175	2.365	2.520	2.700
2.09	2.36	2.63	2.90	3.14	3.41	3.65	3.90
1/16	1/8	1/8	1/8	1/8	1/8	1/8	1/8
0.706	0.79	0.89	0.98	1.06	1.18	1.27	1.43
0.666	0.75	0.83	0.92	1.00	1.08	1.17	1.33

Alternative history

BS 916 - 1953 BS 916 - 1953

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