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NF E25-511 Standard Dimensions for Conical knurled spring washers - CONTACT

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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.

Dimensional Drawing and Technical Diagrams

378_3997.jpg

Key Dimensions and Technical Parameters

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
Z
4.1 +0.3
8 ± 0.29
0.8 ± 0.04
1-1.2
32
0.23 7 4.7
M
4.1 +0.3
10 ± 0.29
0.9 ± 0.04
1.15-1.4
32
0.46 7 4.7
L
4.1 +0.3
14 ± 0.35
1.0 ± 0.04
1.4-1.8
32
1.10 7 4.7
M 5
Z
5.1 +0.3
10 ± 0.29
1.0 ± 0.04
1.25-1.5
36
0.46 8 5.7
M
5.1 +0.3
12 ± 0.35
1.1 ± 0.04
1.45-1.8
36
0.8 8 5.7
L
5.1 +0.3
16 ± 0.35
1.2 ± 0.04
1.7-1.21
36
1.7 8 5.7
M 6
Z
6.1 +0.3
12 ± 0.35
1.2 ± 0.04
1.55-1.85
45
0.79 10 6.8
M
6.1 +0.3
14 ± 0.35
1.3 ± 0.04
1.75-2.1
45
1.27 10 6.8
L
6.1 +0.3
18 ± 0.35
1.4 ± 0.04
2.1-2.5
45
2.48 10 6.8
M 8
Z
8.2 +0.36
16 ± 0.35
1.4 ± 0.04
1.8-2.2
45
1.63 13 9.2
M
8.2 +0.36
18 ± 0.35
1.4 ± 0.04
1.9-2.35
45
2.22 13 9.2
L
8.2 +0.36
22 ± 0.42
1.6 ± 0.05
2.2-2.7
45
4.11 13 9.2
M 10
Z
10.2 +0.36
20 ± 0.42
1.6 ± 0.05
2.1-2.6
45
2.9 16 11.2
M
10.2 +0.36
22 ± 0.42
1.6 ± 0.05
2.25-2.75
45
3.75 16 11.2
L
10.2 +0.36
27 ± 0.42
1.8 ± 0.05
2.6-3.1
45
6.9 16 11.2
M 12
Z
12.4 +0.43
24 ± 0.42
1.8 ± 0.05
2.4-2.9
45
4.69 18 13.7
M
12.4 +0.43
27 ± 0.42
1.8 ± 0.05
2.6-3.1
45
6.34 18 13.7
L
12.4 +0.43
32 ± 0.50
2.0 ± 0.05
3.1-3.6
45
10.65 18 13.7
M 14
M
14.4 +0.43
30 ± 0.24
2.4 ± 0.06
3.2-3.7
45
10.18 21 15.7
M 16
M
16.4 +0.43
32 ± 0.24
2.8 ± 0.06
3.6-4.1
60
12.95 24 17.7
M 20
M
20.5 +0.52
40 ± 0.24
3.2 ± 0.06
4.3-4.9
60
23.12 30 23.1

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
3.1 +0.25
8 ± 0.29
0.6 ± 0.03
0.8-1
28
0.18 6 0.20
L
3.1 +0.25
10 ± 0.29
0.6 ± 0.03
0.95-1
28
0.18 6 0.20

M 4
Z
4.1 +0.3
8 ± 0.29
0.8 ± 0.04
1-1.2
32
0.44 6 0.20
M
4.1 +0.3
10 ± 0.29
0.9 ± 0.04
1.15-1.4
32
0.44 6 0.20
L
4.1 +0.3
14 ± 0.35
1.0 ± 0.04
1.4-1.8
32
0.44 6 0.20

M 5
Z
5.1 +0.3
10 ± 0.29
1.0 ± 0.04
1.25-1.5
36
0.72 6 0.30
M
5.1 +0.3
12 ± 0.35
1.1 ± 0.04
1.45-1.8
36
0.72 6 0.30
L
5.1 +0.3
16 ± 0.35
1.2 ± 0.04
1.7-2.10
36
0.72 6 0.30
M 6
Z
6.1 +0.3
12 ± 0.35
1.2 ± 0.04
1.55-1.85
45
0.89 6 0.30
M
6.1 +0.3
14 ± 0.35
1.3 ± 0.04
1.75-2.1
45
1.18 10 0.30
L
6.1 +0.3
18 ± 0.35
1.4 ± 0.04
2.1-2.5
45
2.34 10 0.30
M 8
Z
8.2 +0.36
16 ± 0.35
1.4 ± 0.04
1.8-2.2
45
1.44 6 0.30
M
8.2 +0.36
18 ± 0.35
1.4 ± 0.04
1.9-2.35
45
2.07 13 0.30
L
8.2 +0.36
22 ± 0.42
1.6 ± 0.05
2.2-2.7
45
3.86 13 0.30
M 10
Z
10.2 +0.36
20 ± 0.42
1.6 ± 0.05
2.1-2.6
45
2.6 6 0.30
M
10.2 +0.36
22 ± 0.42
1.6 ± 0.05
2.25-2.75
45
3.39 16 0.30
L
10.2 +0.36
27 ± 0.42
1.8 ± 0.05
2.6-3.1
45
6.48 16 0.30
M 12
Z
12.4 +0.43
24 ± 0.42
1.8 ± 0.05
2.4-2.9
45
4.13 6 0.30
M
12.4 +0.43
27 ± 0.42
1.8 ± 0.05
2.6-3.1
45
5.87 18 0.30
L
12.4 +0.43
32 ± 0.50
2.0 ± 0.05
3.1-3.6
45
10.1 18 0.30

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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