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BS 4190 5 Standard Dimensions for Hexagon head bolts

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This norm gives the general dimensions and tolerances of black hexagon bolts, screws and nuts with ISO metric threads in diameters from 5 mm to 68 mm inclusive. 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 requirements are included for bolts, screws and nuts finished black all over and for those which have partially machined finishes.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm- source BS 4190 Table 5
Publication date: 10 - 2014 supersedes BS 4190: 2001
d thread size Pitch ds s k
max min max min max min
M5 0.8 5.48 4.52 8 7.64 3.88 3.13
M 6 1 6.48 5.52 10 9.64 4.38 3.63
M 8 1.25 8.58 7.42 13 12.57 5.88 5.13
M 10 1.5 10.58 9.42 17 16.57 7.45 6.55
M 12 1.75 12.7 11.3 19 18.48 8.45 7.55
M 16 2 16.7 15.3 24 23.16 10.45 9.55
M 20 2.5 20.84 19.16 30 29.16 13.9 12.1
M 22 2.5 22.84 21.16 32 31 14.9 13.1
M 24 3 24.84 23.16 36 35 15.9 14.1
M 27 3 27.84 26.16 41 40 17.9 16.1
M 30 3.5 30.84 29.16 46 45 20.05 17.95
M 33 3.5 34 32 50 49 22.05 19.95
M 36 4 37 35 55 53.8 24.05 21.95
M 39 4 40 38 60 58.8 26.05 23.95
M 42 4.5 43 41 65 63.8 27.05 24.95
M 45 4.5 46 44 70 68.8 29.05 26.95
M 48 5 49 47 75 73.8 31.05 28.95
M 52 5 53.2 50.8 80 78.8 34.25 31.75
M 56 5.5 57.2 54.8 85 83.6 36.25 33.75
M 60 5.5 61.2 58.8 90 88.6 39.25 36.75
M 64 6 65.2 62.8 95 93.6 41.25 38.75
M 68 6 69.2 66.8 100 98.6 44.25 41.75

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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