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UNI 8110 Standard Dimensions for Hexagon head thread rolling screws

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Hexagon head thread rolling screws

The standard specifies the characteristics of hexagon head thread forming screws for connections. This type of threaded connection, if the screw is not replaced, offers a good tear resistance, since the clearance between the screw and nut is equal to zero. In addition, the friction between mating parts further increases the unscrewing torque. For the preparation of the holes diameters see UNI 8108.

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source UNI 8110

Publication date: 1993
d thread size M 3 M 3.5 M 4 M 5 M 6 M 8
P 0.5 0.6 0.7 0.8 1 1.25
s max 5 5.55 7 8 10 13
s min 4.82 5.32 6.78 7.78 9.78 12.73
e min 5.45 6.01 7.66 8.87 11.05 14.38
k max 1.87 2.67 2.67 3.42 5.25 6.25
k min 1.62 2.42 2.42 3.12 4.95 5.95
r max 0.45 0.55 0.6 0.7 0.9 1.2

UNI 8110 ≈ commercial items
d thread size M 3 M 3.5 M 4 M 5 M 6 M 8
nominal length l
5 X
6 X X
8 X X X X
10 X X X X X X
12 X X X X X
14 X X X X X
16 X X X X X
20 X X X X X
25 X X X X
30 X X X X
35 X X X X
40 X X X
45 X X X
50 X X X

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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