This product is regulated by the following standards:

Technical data

DIN 128
UNI 8839

Standard DIN 128

Curved spring lock washers

Spring lock washers covered in this standard DIN 128 are deemed to be spring washers designed for use with bolt/nut assemblies involving fasteners of a property class less then 8.8, as specified in ISO 898 part 1. They are intended to counteract the effect of setting which results in bolt/nut assemblies working loose (see DIN 267 part 26). They do not effectively prevent loosening of the assembly under varying radial load and are designed for use with short bolts predominantly subject to thrust.


Dimensions in mm - source DIN 128 - Withdrawn
Publication date: 10/1994 - Supersedes DIN 128: 10/1978
d Nominal size	Thread size	d min	d1 max	b nom	s nom	h min	r	≈ mass in Kg x 1000 pcs (ρ=7,85 kg/dm3)
2	M 2	2.1	4.4	0.9	0.5	0.7	0.1	0.035
2.5	M 2.5	2.6	5.1	1	0.6	0.9	0.1	0.055
3	M 3	3.1	6.2	1.3	0.7	1.1	0.1	0.09
3.5	M 3.5	3.6	6.7	1.3	0.7	1.1	0.1	0.1
4	M 4	4.1	7.6	1.5	0.8	1.2	0.2	0.15
5	M 5	5.1	9.2	1.8	1	1.5	0.2	0.3
6	M 6	6.1	11.8	2.5	1.3	2	0.3	0.7
7	M 7	7.1	12.8	2.5	1.3	2	0.3	0.75
8	M 8	8.1	14.8	3	1.6	2.45	0.5	1.3
10	M 10	10.2	18.1	3.5	1.8	2.85	0.5	2.1
12	M 12	12.2	21.1	4	2.1	3.35	1	3.2
14	M 14	14.2	24.1	4.9	2.4	3.9	1	4.8
16	M 16	16.2	27.4	5	2.8	4.5	1	7
18	M 18	18.2	29.4	5	2.8	4.5	1	7.8
20	M 20	20.2	33.6	6	3.2	5.1	1	12.2
22	M 22	22.5	35.9	6	3.2	5.1	1	13.3
24	M 24	24.5	40.0	7	4.0	6.5	1.6	21.5
27	M 27	27.5	43.0	7	4.0	6.5	1.6	23.7
30	M 30	30.5	48.2	8	6.0	9.5	1.6	42.5
36	M 36	36.5	58.2	10	6.0	10.3	1.6	68
42	M 42	42.5	68.2	12	7	12	2	111
48	M 48	49	75	12	7	12	2	123
56	M 56	57	87	14	8	14	2	193
64	M 64	65	95	14	8	14	2	218
72	M 72	73	103	14	8	14	2	240
80	M 80	81	111	14	8	14	2	262
90	M 90	91	121	14	8	14	2	290
100	M 100	101	131	14	8	14	2	318


Dimensions in mm - source DIN 128 - Withdrawn
Publication date: 10/1987 - Supersedes DIN 128: 04/1968
Nominal size	Thread size	d min	d1 max	b	s nom	h min	r	≈ mass in Kg x 1000 pcs (ρ=7,85 kg/dm3)
2	M 2	2.1	4.4	0.9	0.5	0.7	0.1	0.035
2.5	M 2.5	2.6	5.1	1	0.6	0.9	0.1	0.055
3	M 3	3.1	6.2	1.3	0.7	1.1	0.1	0.09
3.5	M 3.5	3.6	6.7	1.3	0.7	1.1	0.1	0.1
4	M 4	4.1	7.6	1.5	0.8	1.2	0.2	0.15
5	M 5	5.1	9.2	1.8	1	1.5	0.2	0.3
6	M 6	6.1	11.8	2.5	1.3	2	0.3	0.7
7	M 7	7.1	12.8	2.5	1.3	2	0.3	0.75
8	M 8	8.1	14.8	3	1.6	2.45	0.5	1.3
10	M 10	10.2	18.1	3.5	1.8	2.85	0.5	2.1
12	M 12	12.2	21.1	4	2.1	3.35	1	3.2
14	M 14	14.2	24.1	4.9	2.4	3.9	1	4.8
16	M 16	16.2	27.4	5	2.8	4.5	1	7
18	M 18	18.2	29.4	5	2.8	4.5	1	7.8
20	M 20	20.2	33.6	6	3.2	5.1	1	12.2
22	M 22	22.5	35.9	6	3.2	5.1	1	13.3
24	M 24	24.5	40.0	7	4.0	6.5	1.6	21.5
27	M 27	27.5	43.0	7	4.0	6.5	1.6	23.7
30	M 30	30.5	48.2	8	6.0	9.5	1.6	42.5
36	M 36	36.5	58.2	10	6.0	10.3	1.6	68
42	M 42	42.5	68.2	12	7	12	2	111
48	M 48	49	75	12	7	12	2	123
56	M 56	57	87	14	8	14	2	193
64	M 64	65	95	14	8	14	2	218
72	M 72	73	103	14	8	14	2	240
80	M 80	81	111	14	8	14	2	262
90	M 90	91	121	14	8	14	2	290
100	M 100	101	131	14	8	14	2	318

Standard UNI 8839

Curved or crinkled open spring washers

Dimensions in mm - source UNI 8839
Publication date: 10/2013 - Supersedes UNI 8839: 04/1985
d1Nominal size	Thread size	d2 MAX	b nom	s nom	h min	h max	r
2.1	M 2	4.4	0.9	0.5	0.7	0.9	0.1
2.4	M 2.2	4.9	1	0.6	0.9	1.1	0.1
2.6	M 2.5	5.1	1	0.6	0.9	1.1	0.1
3.1	M 3	6.2	1.3	0.7	1.1	1.3	0.1
3.6	M 3.5	6.7	1.3	0.7	1.1	1.3	0.1
4.1	M 4	7.6	1.5	0.8	1.2	1.4	0.2
5.1	M 5	9.2	1.8	1	1.5	1.7	0.2
6.1	M 6	11.8	2.5	1.3	2	2.2	0.3
7.1	M 7	12.8	2.5	1.3	2	2.2	0.3
8.2	M 8	14.9	3	1.6	2.45	2.75	0.5
10.2	M 10	18.1	3.5	1.8	2.85	3.15	0.5
12.2	M 12	21.1	4	2.1	3.35	3.65	1
14.2	M 14	24.1	4.5	2.4	3.9	4.3	1
16.2	M 16	27.4	5	2.8	4.5	5.1	1
18.2	M 18	29.4	5	2.8	4.5	5.1	1
20.2	M 20	33.6	6	3.2	5.1	5.9	1
22.5	M 22	35.9	6	3.2	5.1	5.9	1
24.5	M 24	40.0	7	4.0	6.5	7.5	1.6
27.5	M 27	43.0	7	4.0	6.5	7.5	1.6
30.5	M 30	48.2	8	6.0	9.5	10.5	1.6
36.5	M 36	58.2	10	6.0	10.3	11.3	1.6

Curved spring lock washers

Dimensions in mm - source DIN 128 - Withdrawn
Publication date: 10/1987 - Supersedes DIN 128: 04/1968
Nominal size	Thread size	d min	d1 max	b	s nom	h min	r	≈ mass in Kg x 1000 pcs (ρ=7,85 kg/dm3)
2	M 2	2.1	4.4	0.9	0.5	0.7	0.1	0.035
2.5	M 2.5	2.6	5.1	1	0.6	0.9	0.1	0.055
3	M 3	3.1	6.2	1.3	0.7	1.1	0.1	0.09
3.5	M 3.5	3.6	6.7	1.3	0.7	1.1	0.1	0.1
4	M 4	4.1	7.6	1.5	0.8	1.2	0.2	0.15
5	M 5	5.1	9.2	1.8	1	1.5	0.2	0.3
6	M 6	6.1	11.8	2.5	1.3	2	0.3	0.7
7	M 7	7.1	12.8	2.5	1.3	2	0.3	0.75
8	M 8	8.1	14.8	3	1.6	2.45	0.5	1.3
10	M 10	10.2	18.1	3.5	1.8	2.85	0.5	2.1
12	M 12	12.2	21.1	4	2.1	3.35	1	3.2
14	M 14	14.2	24.1	4.9	2.4	3.9	1	4.8
16	M 16	16.2	27.4	5	2.8	4.5	1	7
18	M 18	18.2	29.4	5	2.8	4.5	1	7.8
20	M 20	20.2	33.6	6	3.2	5.1	1	12.2
22	M 22	22.5	35.9	6	3.2	5.1	1	13.3
24	M 24	24.5	40.0	7	4.0	6.5	1.6	21.5
27	M 27	27.5	43.0	7	4.0	6.5	1.6	23.7
30	M 30	30.5	48.2	8	6.0	9.5	1.6	42.5
36	M 36	36.5	58.2	10	6.0	10.3	1.6	68
42	M 42	42.5	68.2	12	7	12	2	111
48	M 48	49	75	12	7	12	2	123
56	M 56	57	87	14	8	14	2	193
64	M 64	65	95	14	8	14	2	218
72	M 72	73	103	14	8	14	2	240
80	M 80	81	111	14	8	14	2	262
90	M 90	91	121	14	8	14	2	290
100	M 100	101	131	14	8	14	2	318

Full list of Suppliers of Curved spring lock washers

India

B.S. Auto Industries

Manufacturer of washers

South Africa

Fascor

Manufacturer of blind rivets, solid rivets, fully tubular rivets, semi tubular rivets, bifurcated rivets

Turkey

Gülden Bağlanti Elemanlari Imalat San.

Manufacturer of spring washers and cotter pins

China

Hangzhou Spring Washer Co., Ltd.

Manufacturer specialized in spring washers in different materials, also with double rings

China

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

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

J & L SPRINGLOCKWASHER LTD

Manufacturer of spring lock washers and shakeproof washers. Metric and imperial sizes. Production of wire for spring and retaining rings.

Italy

PANZERI Spa

Manufacturer of washers and safety devices for fastening

USA

Willie Washer Manufacturing Corporation

Manufacturer of special washers and stampings

Italy

Filtomatic Fasteners Srl

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

China

BSC CORPORATION LTD

Manufacturer of fasteners, specialized in washers and stampings.

Italy

CCZ srl

Distributor of bushings, wave rings and washers

China

Dongtai City Jianglong Metal Manufacturing Co.Ltd

Biggest factory in China producing stainless steel washers.

Fat washers, spring washers, tooth lock washers and stamping parts.

Materials: 316L ,316S33,1.4462.

Flat Washer Solutions

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

Italy

FRL SRL

Manufacturer of washers and stampings

Germany

Gebr. Großheim OHG

Manufacturer of washers and high quality safety shims. All materials: aluminium, bronze, iron and steel, stainless steel (A2, A4), copper, brass etc.

Italy