This product is regulated by the following standards:

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Hexagon head screws and bolts, inch series BSW-BSF

This product is regulated by the following standards:

BS 1083

Standard BS 1083

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Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon Nuts
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	s min	s max	e
1/4'
5/16'
3/8'
7/16'
1/2'
9/16'
5/8'
3/4'
7/8'
1'
1-1/8'
1-1/4'
1-3/8'
1-1/2'
1-3/4'
2'


Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon Lock Nuts
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	s min	s max	e
1/4'
5/16'
3/8'
7/16'
1/2'
9/16'
5/8'
3/4'
7/8'
1'
1-1/8'
1-1/4'
1-3/8'
1-1/2'
1-3/4'
2'


Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon Slotted Nuts
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	s min	s max	e	n	h
1/4'
5/16'
3/8'
16'
1/2'
9/16'
5/8'
3/4'
7/8'
1'
1-1/8'
1-1/4'
1-3/8'
1-1/2'
1-3/4'
2'


Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon Slotted and Castle Nuts
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	s min	s max	e	n	h
1/4'
5/16'
3/8'
7/16'
1/2'
9/16'
5/8'
3/4'
7/8'
1'
1-1/8'
1-1/4'
1-3/8'
1-1/2'
1-3/4'
2'

Hexagon head screws and bolts, inch series BSW-BSF


Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon Bolts
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	b min	s min	s max	e
1/4'	20	26	0.166	0.176	0.5	0.438	0.445	0.51
5/16'	18	22	0.208	0.218	0.625	0.518	0.525	0.61
3/8'	16	20	0.25	0.26	0.75	0.592	0.6	0.69
7/16'	14	18	0.292	0.302	0.875	0.702	0.71	0.82
1/2'	12	16	0.333	0.343	1	0.812	0.82	0.95
9/16'	12	16	0.365	0.375	1.125	0.912	0.92	1.06
5/8'	11	14	0.407	0.417	1.25	1	1.01	1.17
3/4'	10	12	0.48	0.5	1.5	1.19	1.2	1.39
7/8'	9	11	0.563	0.583	1.75	1.288	1.3	1.5
1'	8	10	0.636	0.666	2	1.468	1.48	1.71
1-1/8'	7	9	0.71	0.75	2.25	1.64	1.67	1.93
1-1/4'	7	9	0.79	0.93	2.5	1.815	1.86	2.15
1-3/8'	6	8	0.88	0.92	2.75	2.005	2.05	2.37
1-1/2'	6	8	0.96	1	3	2.175	2.22	2.56
1-3/4'	5	7	1.11	1.17	3.5	2.52	2.58	2.98
2'	4.5	7	1.27	1.33	4	2.7	2.76	3.19


Dimensions in inches (1 inch=25.4 mm) source BS 1083 Hexagon head screws, washer faced
Publication date: 1965
d Thread size	BSW (nr of threads x inch)	BSF (nr of threads x inch)	k min	k max	s min	s max	e
1/4'	20	26	0.166	0.176	0.438	0.445	0.51
5/16'	18	22	0.208	0.218	0.518	0.525	0.61
3/8'	16	20	0.25	0.26	0.592	0.6	0.69
7/16'	14	18	0.292	0.302	0.702	0.71	0.82
1/2'	12	16	0.333	0.343	0.812	0.82	0.95
9/16'	12	16	0.365	0.375	0.912	0.92	1.06
5/8'	11	14	0.407	0.417	1	1.01	1.17
3/4'	10	12	0.48	0.5	1.19	1.2	1.39
7/8'	9	11	0.563	0.583	1.288	1.3	1.5
1'	8	10	0.636	0.666	1.468	1.48	1.71
1-1/8'	7	9	0.71	0.75	1.64	1.67	1.93
1-1/4'	7	9	0.79	0.93	1.815	1.86	2.15
1-3/8'	6	8	0.88	0.92	2.005	2.05	2.37
1-1/2'	6	8	0.96	1	2.175	2.22	2.56
1-3/4'	5	7	1.11	1.17	2.52	2.58	2.98
2'	4.5	7	1.27	1.33	2.7	2.76	3.19

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Technical data