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UNI 7688 Standard Dimensions for Countersunk flat head screws with cross recess

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This norm has been cancelled

Cross recessed countersunk flat head. ISO metric coarse thread. Category A

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in mm - source UNI 7688Withdrawn
Publication date :10/1977

d thread size
P
k nom/max
recess Nr.
Type H m ref.
Type Z m ref.
M 2.5
0.45
 1.5 2.8 1 2.7
M 3
0.5
 1.65 3.0 1 2.9
M 3.5
0.6
 1.93 4 2 4.1
M 4
0.7
 2.2 4.2 2 4.6
M 5
0.8
 2.5 4.4 2 4.8
M 6
1
 3 6.1 3 6.6
M 8
1.25
 4 8.6 4 8.7
M 10
1.5
 5 9.4 4 9.6

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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