This product is regulated by the following standards:

Technical data

NF E25-511

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.

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
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	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

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	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
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	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

Full list of Suppliers of Conical knurled spring washers - CONTACT

India

B.S. Auto Industries

Manufacturer of washers

Spain

DOISTUA

With exclusive dedication to manufacturing small metal parts, mainly washers, the company is currently one of the outstanding manufacturers in the European washers market.

From the customers drawing and based on applicable automotive standards, the company designs the process and carries out the entire process of manufacturing

China

Hengshun International Trade (H.K.) Co., Ltd

Manufacturer of lock washers, flat washers, spring and tab washers

China

HEWEI DISC SPRING MANUFACTURING CO.,LIMITED.

We focus on manufacturing disc springs, wave springs and serrated washers since 1984. Our facility is ISO9001:2008 Certified . Materies including 50CrV4, SUS301, SUS304, SUS316, 17- 4PH, 17-7PH, 15-7Mo,Inconel 718, Inconel 750, Nimonic 90, H13.

France

Impérator Industries

Manufacturer of special washers and stampings

Italy

PANZERI Spa

Manufacturer of washers and safety devices for fastening

India

Presstech India

Manufacturer of circlips, snap rings, dowel pins, washers, hose clamp

Italy

Schnorr Italia S.R.L.

Manufacturer of disc springs and special washers

Taiwan

TECH STELL Co., LTD

Manufacturer of anti-loosen fastener

Italy

Vipa S.p.a.

VIPA is a leading wholesaler of screws, nuts and bolts. The extensive stock of high-quality screws and bolts and the highly automated warehouse make VIPA the ideal supplier of screws, nuts and bolts with metric threads, drawing parts, special screws, washers, nuts and various fastening systems.

France

Avantage Industrie

Distributor and stockist of standard and special fasteners

Italy

Berardi Bullonerie S.r.l.

Thanks to the wide range of products, to the punctuality and timeliness in responding to the customers’ requests, the company distributes its products to different kinds of clients, set in the whole national territory and specialized in different fields.

Italy

Buora d.p.u. S.r.l.

Founded in 1969, Buora D.P.U. is a distributor certified following ISO 9001.

The company offers the complete range of high strength fasteners, ready on stock, both coarse and fine pitches with metric and inch threads.

Distributor of prestigious brands such as UNBRAKO and NORD-LOCK, for Buora D.P.U. the service always comes first, therefore there is not minimum quantity required.

Italy

Filtomatic Fasteners Srl

Leading manufacturer of stainless steel washers and compensation rings for ball bearings. Standard and special parts.

Spain

Claudio San Martin S.A.

Manufacturer of plain washers, spring washers, security and toothed washers

Taiwan

Durabltec Material Technology Co.Ltd

Manufacturer of special screws

Diameters : inch #1~5/8' / Metric M2~M16

Lengths : Inch 1/4' ~ 15' / Metric 5mm~400mm

Flat Washer Solutions

Manufacturer of standard and special washers in different materials, with internal diameter from 2.5 up to 80mm.

Italy

GANDINI Spa

Distributor of retaining rings, Spiral retaining rings, wave springs, Disc springs, Washers, Elastic pins, Pins, Keys, Ground flat/bar stocks, Locking nuts, washers, Miniplast plastic parts, Metallic screws, nuts, bolts.

France

GRIS DÉCOUPAGE

Manufacturer of flat, conical and toothed Washers

Italy

GROWERMETAL

Producer of spring lock, toothed and special washers.

Quality Certificates: ISO 9001; ISO 14001; ISO/TS 16949

India

The portal for fasteners and fixing elements

Suppliers of Conical knurled spring washers - CONTACT

Technical data

Standard NF E25-511

Details

B.S. Auto Industries

DOISTUA

Hengshun International Trade (H.K.) Co., Ltd

HEWEI DISC SPRING MANUFACTURING CO.,LIMITED.

Impérator Industries

PANZERI Spa

Presstech India

Schnorr Italia S.R.L.

TECH STELL Co., LTD

Vipa S.p.a.

Avantage Industrie

Berardi Bullonerie S.r.l.

Buora d.p.u. S.r.l.

Filtomatic Fasteners Srl

Claudio San Martin S.A.

Durabltec Material Technology Co.Ltd

Flat Washer Solutions

GANDINI Spa

GRIS DÉCOUPAGE

GROWERMETAL

GUJARAT WASHERS MFG

INDUSTRIAS ALZUARAN S.L.

International Industrial Springs IIS

Neel Kamal Enterprises Pvt Ltd.

R + FK Schulte KG

Rui Bo (Suzhou) Machinery& Electronics Co.Ltd

Schnorr GmbH & Co. KG

Suchi Fasteners Pvt Ltd

Technical Stamping(Shanghai) Co. Ltd

TECNIMETAL SRL

Winkemann GmbH & Co. KG

ZMT Metal