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BS 3692 Standard Dimensions for Hexagon head bolts

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The norm BS 3692 gives guidance on the general dimensions and tolerances of precision hexagon bolts, screws and nuts with ISO metric threads in diameters from 1.6mm to 68mm. It also specifies and addresses mechanical properties of carbon or alloy steel bolts, screws and nuts, which are to be used for special applications.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source BS 3692
Publication date: 10/2014

d Thread size

 P ds min

ds max

 k min k max e min. e max s min

s max
M 1.6 0.35 1.46 1.6 0.98 1.23 3.48 3.7 3.08 3.2
M 2 0.4 1.86 2 1.28 1.53 4.38 4.6 3.88 4
M 2.5 0.45 2.23 2.5 1.58 1.83 5.51 5.8 4.88 5
M 3 0.5 2.86 3 1.90 2.13 6.08 6.4 5.38 5.5
M 4 0.7 3.82 4 2.68 2.93 7.74 8.1 6.85 7
M 5 0.8 4.82 5 3.35 3.66 8.87 9.2 7.85 8
M 6 1 5.82 6 3.85 4.15 11.05 11.5 9.78 10
M 8 1.25 7.78 8 5.35 5.65 14.38 15 12.73 13
M 10 1.5 9.78 10 6.82 7.18 18.9 19.6 16.73 17
M 12 1.75 11.73 12 7.82 8.18 21.1 21.9 18.67 19
M 14 2 13.73 14 8.82 9.18 24.49 25.4 21.67 22
M 16 2 15.73 16 9.82 10.18 26.75 27.7 23.67 24
M 18 2.5 17.73 18 11.79 12.22 30.14 31.2 26.67 27
M 20 2.5 19.73 20 12.79 13.22 33.53 34.6 29.67 30
M 22 2.5 21.67 22 13.79 14.22 35.72 36.9 31.61 32
M 24 3 23.67 24 14.79 15.22 39.98 41.6 35.38 36
M 27 3 26.67 27 16.79 17.22 45.63 47.3 40.38 41
M 30 3.5 29.67 30 18.74 19.26 51.28 53.1 45.38 46
M 33 3.5 32.61 33 20.74 21.26 55.8 57.7 49.38 50
M 36 4 35.61 36 22.74 23.26 61.31 63.5 54.26 55
M 39 4 38.61 39 24.74 25.26 66.96 69.3 59.26 60
M 42 4.5 41.61 42 25.74 26.26 72.61 75.1 64.26 65
M 45 4.5 44.61 45 27.74 28.26 78.26 80.8 69.26 70
M 48 5 47.61 48 29.74 30.26 83.91 86.6 84.26 75
M 52 5 51.54 52 32.69 33.21 89.56 92.4 79.26 80
M 56 5.5 55.54 56 34.69 35.31 95.07 98.1 84.13 85
M 60 5.5 59.54 60 37.69 38.31 100.72 103.9 89.13 90
M 64 6 63.54 64 39.69 40.31 106.37 109.7 94.13 95
M 68 6 67.54 68 42.69 43.31 112.02 115.5 99.13 100

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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