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NF E25-540 Standard Dimensions for Tab washers with long tab

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Tab Washers with Tabs

This standard specifies the dimensions and characteristics of sheet metal safety washers, with raised edge. These washers have the purpose of immobilizing a fastener in rotation on the assembled parts by folding a part of the washer against a face of the nut or screw head after screwing.

Dimensional Drawing and Technical Diagrams

1847_O2hVss_nf-e25-540.jpg

Key Dimensions and Technical Parameters

Dimensions in mm - source NF E25-540
Publication date: 06/2010
d thread size
c1 (0/-2)
e min
 b (+1/0) a (+/- 2,5%)
f (+1/0)
M 4
 10 6.8 10 4.5 -
M 5
 13 7 10 5.5 5
M 6
 16 8 16 7 6
M 8
 18 11 20 9 8
M 10
 23 14 25 11 9
M 12
 25 17 28 14 12
M 14
 28 19 30 16 13
M 16
 32 21 34 18 15
M 18
 36 23 36 20 16
M 20
 40 26 40 22 18
M 22
 45 28 42 24 20
M 24
 48 31 45 27 22
M 27
 55 34 48 30 24
M 30
 60 38 55 36 26
M 33
 66 41 60 36 29
M 36
 72 45 65 39 31

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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