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BS 1083 Standard Dimensions for Hexagon head screws and bolts, inch series BSW-BSF

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Key Dimensions and Technical Parameters

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

v

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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