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Technical data for Conical knurled spring washers - CONTACT

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This product is regulated by the following standards:

Standard NF E25-511

Contact washers 

 

The Contact washers are produced in accordance with the French National Norm NFE 25-511. They are conical shaped lock washers made with a ribbed top surface, in a variety of dimensions and thicknesses to suit various applications. The conical shape exerts locking force 360° around the underside of the bolt head or nut. The knurled top surface the locking force and resists the torqued fastener connection potential for loosening under pressure and vibration.

Conical knurled spring washers - CONTACT

Dimensions in mm - source NFE 25511

Publication date: 1984

Thread size
Type
d
D
s h min/max before first clamping Nr. of Knurlings

~ Weight kgs/1000 pcs

d1 min d2 min
M 3
Z
3.1 +0.25
6 ± 0.24
0.5 ± 0.03
0.7-0.9
28
 0.08 5.5 3.6
M
3.1 +0.25
8 ± 0.29
0.6 ± 0.03
 0.8-1
28
0.2 5.5 3.6
L
3.1 +0.25
10 ± 0.29
0.6 ± 0.03
 0.95-1
28
 0.33 5.5 3.6
M 4
M
L
M 5
M
L
M 6
M
L
M 8
M
L
M 10
M
L
M 12
M
L
M 14
M 16
M 20


Dimensions in mm - source NFE 25511 - with locking nips

Thread size
Type
d
D
s h min/max before first clamping Nr. of Knurlings

~ Weight kgs/1000 pcs

nips
nr of nips height
M 3
Z
3.1 +0.25
6 ± 0.24
0.5 ± 0.03
0.7-0.9
28
 0.18 6 0.20
M
L

 M 4
 
M
L

 M 5
 
M
L
M 6
M
L
M 8
M
L
M 10
M
L
M 12
M
L


The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from AFNOR - Association Française de Normalization, 11 Rue Francis de Pressensé, 93210 Saint-Denis, France.
WARNING - The datasheets provided by this site (fasten.it) are only advisory in support of the commercial activity and their use by anyone is entirely voluntary. Reliance on their contents for any purpose by anyone is at his/her sole risk and Fasten.it s.r.l./www.fasten.it is not responsible for any loss, claim or damage arising there from.
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This product is regulated by the following standards:
NF E25-511
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