Standard BS 1083


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'	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


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'	20	26	0.123	0.133	0.438	0.445	0.51
5/16'	18	22	0.156	0.166	0.518	0.525	0.61
3/8'	16	20	0.198	0.208	0.592	0.6	0.69
7/16'	14	18	0.24	0.25	0.702	0.71	0.82
1/2'	12	16	0.281	0.291	0.812	0.82	0.95
9/16'	12	16	0.323	0.333	0.912	0.92	1.06
5/8'	11	14	0.365	0.375	1	1.01	1.17
3/4'	10	12	0.448	0.458	1.19	1.2	1.39
7/8'	9	11	0.49	0.5	1.288	1.3	1.5
1'	8	10	0.573	0.583	1.468	1.48	1.71
1-1/8'	7	9	0.656	0.666	1.64	1.67	1.93
1-1/4'	7	9	0.73	0.75	1.815	1.86	2.15
1-3/8'	6	8	0.813	0.833	2.005	2.05	2.37
1-1/2'	6	8	0.896	0.916	2.175	2.22	2.56
1-3/4'	5	7	1.063	1.083	2.52	2.58	2.98
2'	4.5	7	1.146	1.166	2.7	2.76	3.19


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'	20	26	0.25	0.26	0.438	0.445	0.51	0.09÷0.1	0.16÷0.17
5/16'	18	22	0.27	0.28	0.518	0.525	0.61	0.09÷0.1	0.18÷0.19
3/8'	16	20	0.302	0.312	0.592	0.6	0.69	0.09÷0.1	0.212÷0.222
16'	14	18	0.365	0.375	0.702	0.71	0.82	0.125÷0.135	0.225÷0.235
1/2'	12	16	0.427	0.437	0.812	0.82	0.95	0.125÷0.135	0.287÷0.297
9/16'	12	16	0.49	0.5	0.912	0.92	1.06	0.165÷0.175	0.303÷0.313
5/8'	11	14	0.552	0.562	1	1.01	1.17	0.165÷0.175	0.365÷0.375
3/4'	10	12	0.677	0.687	1.19	1.2	1.39	0.208÷0.218	0.443÷0.453
7/8'	9	11	0.74	0.75	1.288	1.3	1.5	0.208÷0.218	0.506÷0.516
1'	8	10	0.865	0.875	1.468	1.48	1.71	0.25÷0.26	0.585÷0.595
1-1/8'	7	9	0.99	1	1.64	1.67	1.93	0.25÷0.26	0.71÷0.72
1-1/4'	7	9	1.105	1.125	1.815	1.86	2.15	0.29÷0.3	0.777÷0.797
1-3/8'	6	8	1.23	1.25	2.005	2.05	2.37	0.29÷0.3	0.902÷0.922
1-1/2'	6	8	1.355	1.375	2.175	2.22	2.56	0.29÷0.3	1.027÷1.047
1-3/4'	5	7	1.605	1.625	2.52	2.58	2.98	0.333÷0.343	1.23÷1.25
2'	4.5	7	1.73	1.75	2.7	2.76	3.19	0.416÷0.426	1.262÷1.282


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'	20	26	0.25	0.26	0.438	0.445	0.51	0.09÷0.1	0.19÷0.2
5/16'	18	22	0.27	0.28	0.518	0.525	0.61	0.09÷0.1	0.24÷0.25
3/8'	16	20	0.302	0.312	0.592	0.6	0.69	0.09÷0.1	0.302÷0.312
7/16'	14	18	0.365	0.375	0.702	0.71	0.82	0.125÷0.135	0.365÷0.375
1/2'	12	16	0.427	0.437	0.812	0.82	0.95	0.125÷0.135	0.427÷0.437
9/16'	12	16	0.49	0.5	0.912	0.92	1.06	0.165÷0.175	0.49÷0.5
5/8'	11	14	0.552	0.562	1	1.01	1.17	0.165÷0.175	0.552÷0.562
3/4'	10	12	0.677	0.687	1.19	1.2	1.39	0.208÷0.218	0.677÷0.687
7/8'	9	11	0.74	0.75	1.288	1.3	1.5	0.208÷0.218	0.74÷0.75
1'	8	10	0.865	0.875	1.468	1.48	1.71	0.25÷0.26	0.865÷0.875
1-1/8'	7	9	0.99	1	1.64	1.67	1.93	0.25÷0.26	0.99÷1
1-1/4'	7	9	1.105	1.125	1.815	1.86	2.15	0.29÷0.3	1.105÷1.125
1-3/8'	6	8	1.23	1.25	2.005	2.05	2.37	0.29÷0.3	1.23÷1.25
1-1/2'	6	8	1.355	1.375	2.175	2.22	2.56	0.29÷0.3	1.355÷1.375
1-3/4'	5	7	1.605	1.625	2.52	2.58	2.98	0.333÷0.343	1.605÷1.625
2'	4.5	7	1.73	1.75	2.7	2.76	3.19	0.416÷0.426	1.73÷1.75

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

Standard BS 1083

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