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
Thread size	Type	d	D	s	h min/max before first clamping	Nr. of Knurlings	~ Weight kgs/1000 pcs	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.
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Technical data for Conical knurled spring washers - CONTACT

This product is regulated by the following standards:

Standard NF E25-511

Conical knurled spring washers - CONTACT

Suppliers of Conical knurled spring washers - CONTACT

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