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DIN 34801 Standard Dimensions for Bolts and screws with hexalobular head with large flange

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Bolts and screws with hexalobular head with large flange

This standard specifies dimensions and technical delivery conditions from M5 to M20 coarse and fine pitch thread steel hexalobular head bolts with large flange, of property classes 8.8, 10.9, A2-70 and A4-70 and product grades A and B.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source DIN 34801
Publication date: 08/2021 Supersedes 12/1999
d thread size P k max=nom c
min/max		 dc nom=max ds min/max r l dt nom
M 5 0.8 6.5 1.45 1.70 11.80 4.82 5 0.2 0.9 7.3
M 6 1 7.5 1.75 2 14.20 5.82 6 0.25 0.9 9.2
M 8 1.25 10 2.65 2.9 17.9 7.78 8 0.4 0.9 10.95
M 10 1.5 12 3.60 3.9 21.8 9.78 10 0.4 1.3 12.65
M 12 1.75 14 4.10 4.40 26 11.73 12 0.6 1.3 16.4
M 14 2 16 5.10 5.40 29.9 13.73 14 0.6 1.3 18.15
M 16 2 19 5.50 5.8 34.5 15.73 16 0.6 1.3 21.85
M 18 2.5 21.5 6 6.4 38.6 17.73 18 0.6 1.4 25.4
M 20 2.5 24 6.5 6.9 42.8 19.67 20 0.8 1.4 28.9

Dimensions in mm - source DIN 34801
Publication date: 12/1999
d thread size P b k max=nom c
min/max		 dc nom=max ds min/max df nom
M 5 0.8 40 6.5 1.45 1.70 11.80 4.82 5 7.3
M 6 1 50 7.5 1.75 2 14.20 5.82 6 9.2
M 8 1.25 65 10 2.65 2.9 17.9 7.78 8 10.95
M 10 1.5 80 12 3.60 3.9 21.8 9.78 10 12.65
M 12 1.75 80 14 4.10 4.40 26 11.73 12 16.4
M 14 2 80 16 5.10 5.40 29.9 13.73 14 18.15
M 16 2 80 19 5.50 5.8 34.5 15.73 16 21.85
M 18 2.5 80 21.5 6 6.4 38.6 17.73 18 25.4
M 20 2.5 80 24 6.5 6.9 42.8 19.67 20 28.9

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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