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UNI 8114 Standard Dimensions for Thread forming screws, countersunk raised head, cross recessed

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Thread forming screws, countersunk raised head, cross recessed

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

1050_3307.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source UNI 8114

Publication date: 1993
d thread size M 2 M 2.2 M 2.5 M 3 M 3.5 M 4 M 5 M 6 M 8
P 0.4 0.45 0.45 0.5 0.6 0.7 0.8 1 1.25
D max 3.8 4.3 4.7 5.6 6.5 7.5 9.2 11 14.5
D min 3.5 4 4.4 5.3 6.14 7.14 8.84 10.57 14.07
f ≈ 0.4 0.5 0.6 0.75 0.85 1 1.25 1.5 2
k max 1.2 1.3 1.5 1.65 1.93 2.2 2.5 3 4
r1 ≈ 0.2 0.25 0.25 0.3 0.35 0.4 0.5 0.6 0.8
r2 ≈ 4 3.8 5.4 6 7 8 9.4 12 15
Z recess nr 1 1 1 1 2 2 2 3 4
m ≈ 2.4 2.4 2.8 3 4 4.2 4.4 6.1 8.5
max depth 1.35 1.35 1.73 2.01 2.06 2.31 2.51 2.92 4.38
min depth 1.1 1.1 1.48 1.76 1.6 1.85 2.05 2.46 3.86
H recess nr 1 1 1 1 2 2 2 3 4
m ≈ 2.8 2.8 2.7 3.1 4.2 4.5 5.3 6.8 9
max depth 1.57 1.57 1.6 2 2.24 2.54 3.27 3.53 4.68
min depth 1.17 1.17 1.3 1.7 1.74 2.04 2.77 3.03 4.18

UNI 8114 ≈ commercial items
d thread size M 2 M 2.2 M 2.5 M 3 M 3.5 M 4 M 5 M 6 M 8
nominal length l
6 X X X
8 X X X X X
10 X X X X X X X
12 X X X X X X X
14 X X X X X X X X
16 X X X X X X X X X
20 X X X X X X X
25 X X X X X X X
30 X X X X X X
35 X X X X
40 X 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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