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