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UNI 9327 Standard Dimensions for Hexagon socket head cap screws with low head

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Hexagon socket head cap screws with low head

The UNI 9327 standard establishes the characteristics of low cylindrical head screws with hexagon socket, with coarse thread from M1.6 to M56 and fine pitch from M8 x 1 to M56 x 4, of category A.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source UNI 9327
Publication date: 11-1988
d thread size P coarse thread P fine thread dk nom=max k min k max s nom t min b rif
M 1.6 0.35 - 3 1.1 1.2 1.5 0.53 15
M 2 0.4 - 3.8 1.4 1.5 1.5 0.75 16
M 2.5 0.45 - 4.5 1.78 1.88 2 0.85 17
M 3 0.5 - 5.5 2.15 2.25 2.5 1.1 18
M 4 0.7 - 7 2.9 3 3 1.5 20
M 5 0.8 - 8.5 3.57 3.75 4 1.9 22
M 6 1 - 10 4.32 4.5 5 2.4 24
M 8 1.25 1 13 5.82 6 6 3.2 28
M 10 1.5 1.25 16 7.28 7.5 8 3.8 32
M 12 1.75 1.25 18 8.78 9 10 4.4 36
M 14 2 1.5 21 10.23 10.5 12 5 40
M 16 2 1.5 24 11.73 12 14 5.8 44
M 18 2.5 1.5 27 13.23 13.5 14 6.6 48
M 20 2.5 1.5 30 14.73 15 17 7.3 52
M 22 2.5 1.5 33 16.23 16.5 17 8 56
M 24 3 2 36 17.73 18 19 8.8 60
M 27 3 2 40 19.92 20.25 19 9.9 66
M 30 3.5 2 45 22.17 22.5 22 11 72
M 33 3.5 2 50 24.42 24.75 24 12.1 78
M 36 4 3 54 26.67 27 27 13.2 84
M 39 4 3 58 28.92 29.25 27 14.4 90
M 42 4.5 3 63 31.11 31.5 32 15.5 96
M 48 5 3 72 35.61 36 36 17.8 106
M 52 5 3 78 38.54 39 36 19 116
M 56 5.5 4 84 41.54 42 41 20 124

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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