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NF E25-122 Standard Dimensions for Cross recessed countersunk flat head screws type H or Z

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Machine screws large round head type ''''Poêlier''''  with reduced load capacity, cross recess Z - Symbol RL Z

This norm specifies the dimensions and characteristics of machine screws with large pan head type 'Poêlier', reduced load capacity, cross recess Z, symbol RL Z, of grade A, with ISO metric thread, and nominal diameters from M3 to M8 included. Due to their reduced load capacity, these screws should only be used for applications where high preload is not required.

Dimensional Drawing and Technical Diagrams

1397_R5UPe7_nf-e25-122.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source NF E25-122
Publication date: 08-1984
d Thread size
P
k
dc
 t min r min ds min
h
dk
b min
min
max
min
max
M 3
0.5
1.4
1.7
6
6.6
 1.30 0.1 2.5
0.7
5.5
25
M 3.5
0.6
2.1
2.4
7.5
8
 1.45 0.1 2.9
0.9
7
38
M 4
0.7
2.3
2.6
9
9.5
 1.70 0.2 3.3
1
8
38
M 5
0.8
2.5
2.9
10.5
11
 2.05 0.2 4.2
1
9
38
M 6
1
3.1
3.7
13
13.5
 2.25 0.25 5.0
1.4
11
38
M 8
1.25
4.4
5
16.2
17
 3.40 0.4 6.8
1.8
16
38

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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