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This product is regulated by the following standards:

ASME B18.21.1 TABLE 1 ASME B18.21.1 TABLE 2 ASME B18.21.1 TABLE 3 ASME B18.21.1 TABLE 4

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Helical spring-lock washers, inch sizes

This product is regulated by the following standards:

Standard ASME B18.21.1 TABLE 1

Helical spring-lock washers, regular seriesInformation restricted to registered users: Login | Register now for a 14 day free trial

Dimensions in inches: source ASME B18.21.1 -2009-Table 1 Regular series
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.172	0.020	0.035
No.3 (0.099)	0.107	0.101	0.195	0.025	0.040
No.4 (0.112)	0.120	0.114	0.209	0.025	0.040
No.5 (0.125)	0.133	0.127	0.236	0.031	0.047
No.6 (0.138)	0.148	0.141	0.250	0.031	0.047
No.8 (0.164)
No.10 (0.190)
No.12 (0.216)
1/4- (0.250)
5/16- (0.3125)
3/8- (0.375)
7/16-(0.4375)
1/2- (0.5)
9/16- (0.5625)
5/8- (0.625)
11/16- (0.6875)
3/4- (0.75)
13/16-(0.8125)
7/8- (0.875)
15/16 (0.9375)
1- (1)
1-1/16 (1.0625)
1-1/8 (1.125)
1-3/16 (1.875)
1- 1/4 (1.25)
1 - 5/16 (1.3125)
1 - 3/8 (1.375)
1 - 7/16 (1.4375)
1 - 1/2 (1.5)
1 - 5/8 (1.625)
1 - 3/4 (1.75)
1 - 7/8 (1.875)
2 (2)
2 - 1/4 (2.5)
2 - 1/2 (2.5)
2 - 3/4 (2.75)
3 (3)

Standard ASME B18.21.1 TABLE 2

Helical spring-lock washers, heavy seriesInformation restricted to registered users: Login | Register now for a 14 day free trial

Dimensions in inches: source ASME B18.21.1 -2009-Table 2 Heavy series
Nominal Washer Size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.182	0.025	0.040
No.3 (0.099)	0.107	0.101	0.209	0.031	0.047
No.4 (0.112)	0.120	0.114	0.223	0.031	0.047
No.5 (0.125)	0.133	0.127	0.252	0.040	0.055
No.6 (0.138)	0.148	0.141	0.266	0.040	0.055
No.8 (0.164)
No.10 (0.190)
No.12 (0.216)
1/4 - (0.250)
5/16 - (0.3125)
3/8 - (0.375)
7/16 -(0.4375)
1/2 - (0.5)
9/16 - (0.5625)
5/8 - (0.625)
11/16 - (0.6875)
3/4 - (0.75)
13/16 -(0.8125)
7/8 - (0.875)
15/16 - (0.9375)
1 - (1)
1-1/16 (1.0625)
1-1/8 (1.125)
1-3/16 (1.875)
1- 1/4 (1.25)
1 - 5/16 (1.3125)
1 - 3/8 (1.375)
1 - 7/16 (1.4375)
1 - 1/2 (1.5)
1 - 5/8 (1.625)
1 - 3/4 (1.75)
1 - 7/8 (1.875)
2 (2)
2 - 1/4 (2.5)
2 - 1/2 (2.5)
2 - 3/4 (2.75)
3 (3)

Standard ASME B18.21.1 TABLE 3

Helical spring-lock washers extra-duty seriesInformation restricted to registered users: Login | Register now for a 14 day free trial

Dimensions in inches: source ASME B18.21.1 -2009-Table 3 Extra-duty series
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.208	0.027	0.053
No.3 (0.099)	0.107	0.101	0.239	0.034	0.062
No.4 (0.112)	0.120	0.114	0.253	0.034	0.062
No.5 (0.125)	0.133	0.127	0.300	0.045	0.079
No.6 (0.138)	0.148	0.141	0.314	0.045	0.079
No.8 (0.164)
No.10 (0.190)
No.12 (0.216)
1/4 - (0.250)
5/16 - (0.3125)
3/8 - (0.375)
7/16 -(0.4375)
1/2 - (0.5)
9/16 - (0.5625)
5/8 - (0.625)
11/16 - (0.6875)
3/4 - (0.75)
13/16 -(0.8125)
7/8 - (0.875)
15/16 (0.9375)
1 - (1)
1-1/16 (1.0625)
1-1/8 (1.125)
1-3/16 (1.875)
1- 1/4 (1.25)
1 - 5/16 (1.3125)
1 - 3/8 (1.375)
1 - 7/16 (1.4375)
1 - 1/2 (1.5)
1 - 5/8 (1.625)
1 - 3/4 (1.75)
1 - 7/8 (1.875)
2 (2)

Standard ASME B18.21.1 TABLE 4

Helical spring-lock washers, High CollarInformation restricted to registered users: Login | Register now for a 14 day free trial

Dimensions in inches: source ASME B18.21.1 -2009- Table 4 High Collar
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.4 (0.112)	0.120	0.114	0.173	0.022	0.022
No.5 (0.125)	0.133	0.127	0.202	0.030	0.030
No.6 (0.138)	0.148	0.141	0.216	0.030	0.030
No.8 (0.164)
No.10 (0.190)
1/4 - (0.250)
5/16 - (0.3125)
3/8 - (0.375)
7/16 -(0.4375)
1/2 - (0.5)
5/8 - (0.625)
3/4 - (0.75)
7/8 - (0.875)
1 - (1)
1-1/8 (1.125)
1- 1/4 (1.25)
1 - 3/8 (1.375)
1 - 1/2 (1.5)
1 - 3/4 (1.75)
2 - (2)
2 - 1/4 (2.5)
2 - 1/2 (2.5)
2 - 3/4 (2.75)
3 - (3)

Helical spring-lock washers, inch sizes

Dimensions in inches: source ASME B18.21.1 -2009-Table 1 Regular series
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.172	0.020	0.035
No.3 (0.099)	0.107	0.101	0.195	0.025	0.040
No.4 (0.112)	0.120	0.114	0.209	0.025	0.040
No.5 (0.125)	0.133	0.127	0.236	0.031	0.047
No.6 (0.138)	0.148	0.141	0.250	0.031	0.047
No.8 (0.164)	0.174	0.167	0.293	0.040	0.055
No.10 (0.190)	0.2	0.193	0.334	0.047	0.062
No.12 (0.216)	0.227	0.220	0.377	0.056	0.070
1/4- (0.250)	0.26	0.252	0.487	0.062	0.109
5/16- (0.3125)	0.322	0.314	0.583	0.078	0.125
3/8- (0.375)	0.385	0.377	0.680	0.094	0.141
7/16-(0.4375)	0.45	0.44	0.776	0.109	0.156
1/2- (0.5)	0.641	0.628	1.073	0.156	0.203
9/16- (0.5625)	0.574	0.564	0.965	0.141	0.188
5/8- (0.625)	0.641	0.628	1.073	0.156	0.203
11/16- (0.6875)	0.704	0.691	1.170	0.172	0.219
3/4- (0.75)	0.766	0.753	1.265	0.188	0.234
13/16-(0.8125)	0.832	0.816	1.363	0.203	0.250
7/8- (0.875)	0.894	0.878	1.459	0.219	0.266
15/16 (0.9375)	0.958	0.941	1.556	0.234	0.281
1- (1)	1.024	1.003	1.656	0.25	0.297
1-1/16 (1.0625)	1.087	1.066	1.751	0.266	0.312
1-1/8 (1.125)	1.153	1.129	1.847	0.281	0.328
1-3/16 (1.875)	1.217	1.192	1.943	0.297	0.344
1- 1/4 (1.25)	1.280	1.254	2.036	0.312	0.359
1 - 5/16 (1.3125)	1.344	1.317	2.133	0.328	0.375
1 - 3/8 (1.375)	1.408	1.379	2.219	0.344	0.391
1 - 7/16 (1.4375)	1.472	1.442	2.234	0.359	0.406
1 - 1/2 (1.5)	1.534	1.504	2.419	0.375	0.422
1 - 5/8 (1.625)	1.663	1.663	2.553	0.389	0.424
1 - 3/4 (1.75)	1.798	1.758	2.679	0.389	0.424
1 - 7/8 (1.875)	1.914	1.833	2.811	0.422	0.427
2 (2)	20.39	2.008	2.936	0.422	0.427
2 - 1/4 (2.5)	2.293	2.262	3.221	0.440	0.442
2 - 1/2 (2.5)	2.543	2.512	3.471	0.440	0.442
2 - 3/4 (2.75)	2.793	2.762	3.824	0.458	0.491
3 (3)	3.043	3.012	4.074	0.458	0.491


Dimensions in inches: source ASME B18.21.1 -2009-Table 2 Heavy series
Nominal Washer Size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.182	0.025	0.040
No.3 (0.099)	0.107	0.101	0.209	0.031	0.047
No.4 (0.112)	0.120	0.114	0.223	0.031	0.047
No.5 (0.125)	0.133	0.127	0.252	0.040	0.055
No.6 (0.138)	0.148	0.141	0.266	0.040	0.055
No.8 (0.164)	0.174	0.167	0.307	0.047	0.062
No.10 (0.190)	0.2	0.193	0.350	0.056	0.070
No.12 (0.216)	0.227	0.220	0.391	0.063	0.077
1/4 - (0.250)	0.26	0.252	0.489	0.077	0.110
5/16 - (0.3125)	0.322	0.314	0.593	0.097	0.130
3/8 - (0.375)	0.385	0.377	0.688	0.115	0.145
7/16 -(0.4375)	0.45	0.44	0.784	0.133	0.160
1/2 - (0.5)	0.512	0.502	0.879	0.151	0.176
9/16 - (0.5625)	0.574	0.564	0.975	0.170	0.193
5/8 - (0.625)	0.641	0.628	1.087	0.189	0.210
11/16 - (0.6875)	0.704	0.691	1.186	0.207	0.227
3/4 - (0.75)	0.766	0.753	1.285	0.226	0.244
13/16 -(0.8125)	0.832	0.816	1.387	0.246	0.262
7/8 - (0.875)	0.894	0.878	1.489	0.266	0.281
15/16 - (0.9375)	0.958	0.941	1.59	0.284	0.298
1 - (1)	1.024	1.003	1.7	0.306	0.319
1-1/16 (1.0625)	1.087	1.066	1.803	0.326	0.338
1-1/8 (1.125)	1.153	1.129	1.903	0.345	0.356
1-3/16 (1.875)	1.217	1.192	2.001	0.364	0.373
1- 1/4 (1.25)	1.280	1.254	2.104	0.384	0.393
1 - 5/16 (1.3125)	1.344	1.317	2.203	0.403	0.410
1 - 3/8 (1.375)	1.408	1.379	2.301	0.422	0.427
1 - 7/16 (1.4375)	1.472	1.442	2.396	0.440	0.442
1 - 1/2 (1.5)	1.534	1.504	2.491	0.458	0.458
1 - 5/8 (1.625)	1.663	1.663	2.694	0.458	0.491
1 - 3/4 (1.75)	1.798	1.758	2.820	0.458	0.491
1 - 7/8 (1.875)	1.914	1.833	2.945	0.458	0.491
2 (2)	2.039	2.008	3.144	0.496	0.526
2 - 1/4 (2.5)	2.293	2.262	3.398	0.496	0.526
2 - 1/2 (2.5)	2.543	2.512	3.648	0.496	0.526
2 - 3/4 (2.75)	2.793	2.762	3.910	0.526	0.532
3 (3)	3.043	3.012	4.160	0.526	0.532


Dimensions in inches: source ASME B18.21.1 -2009-Table 3 Extra-duty series
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.2 (0.086)	0.094	0.088	0.208	0.027	0.053
No.3 (0.099)	0.107	0.101	0.239	0.034	0.062
No.4 (0.112)	0.120	0.114	0.253	0.034	0.062
No.5 (0.125)	0.133	0.127	0.300	0.045	0.079
No.6 (0.138)	0.148	0.141	0.314	0.045	0.079
No.8 (0.164)	0.174	0.167	0.375	0.057	0.096
No.10 (0.190)	0.2	0.193	0.434	0.068	0.112
No.12 (0.216)	0.227	0.220	0.497	0.080	0.130
1/4 - (0.250)	0.26	0.252	0.533	0.084	0.132
5/16 - (0.3125)	0.322	0.314	0.619	0.108	0.143
3/8 - (0.375)	0.385	0.377	0.738	0.123	0.170
7/16 -(0.4375)	0.45	0.44	0.836	0.143	0.186
1/2 - (0.5)	0.512	0.502	0.935	0.162	0.204
9/16 - (0.5625)	0.574	0.564	1.035	0.182	0.223
5/8 - (0.625)	0.641	0.628	1.151	0.202	0.242
11/16 - (0.6875)	0.704	0.691	1.252	0.221	0.260
3/4 - (0.75)	0.766	0.753	1.355	0.241	0.279
13/16 -(0.8125)	0.832	0.816	1.458	0.261	0.298
7/8 - (0.875)	0.894	0.878	1.751	0.285	0.322
15/16 (0.9375)	0.958	0.941	1.684	0.308	0.345
1 - (1)	1.024	1.003	1.794	0.330	0.366
1-1/16 (1.0625)	1.087	1.066	1.905	0.352	0.389
1-1/8 (1.125)	1.153	1.129	2.013	0.375	0.411
1-3/16 (1.875)	1.217	1.192	2.107	0.396	0.431
1- 1/4 (1.25)	1.280	1.254	2.222	0.417	0.452
1 - 5/16 (1.3125)	1.344	1.317	2.327	0.438	0.472
1 - 3/8 (1.375)	1.408	1.379	2.429	0.458	0.491
1 - 7/16 (1.4375)	1.472	1.442	2.530	0.478	0.509
1 - 1/2 (1.5)	1.534	1.504	2.627	0.496	0.526
1 - 5/8 (1.625)	1.663	1.663	2.784	0.496	0.526
1 - 3/4 (1.75)	1.798	1.758	2.902	0.526	0.532
1 - 7/8 (1.875)	1.914	1.883	3.027	0.526	0.532
2 (2)	2.039	2.008	3.156	0.526	0.532


Dimensions in inches: source ASME B18.21.1 -2009- Table 4 High Collar
Nominal washer size	A max	A min	B max	T mean section thickness (t1+t)/2	W min
No.4 (0.112)	0.120	0.114	0.173	0.022	0.022
No.5 (0.125)	0.133	0.127	0.202	0.030	0.030
No.6 (0.138)	0.148	0.141	0.216	0.030	0.030
No.8 (0.164)	0.174	0.167	0.267	0.047	0.042
No.10 (0.190)	0.2	0.193	0.294	0.047	0.042
1/4 - (0.250)	0.26	0.252	0.363	0.078	0.047
5/16 - (0.3125)	0.322	0.314	0.457	0.093	0.062
3/8 - (0.375)	0.385	0.377	0.55	0.125	0.076
7/16 -(0.4375)	0.45	0.44	0.644	0.140	0.090
1/2 - (0.5)	0.512	0.502	0.733	0.172	0.103
5/8 - (0.625)	0.641	0.628	0.917	0.203	0.125
3/4 - (0.75)	0.766	0.753	1.105	0.218	0.154
7/8 - (0.875)	0.894	0.878	1.291	0.234	0.182
1 - (1)	1.024	1.003	1.478	0.25	0.208
1-1/8 (1.125)	1.153	1.129	1.663	0.313	0.236
1- 1/4 (1.25)	1.280	1.254	1.790	0.313	0.236
1 - 3/8 (1.375)	1.408	1.379	2.031	0.375	0.292
1 - 1/2 (1.5)	1.534	1.504	2.159	0.375	0.292
1 - 3/4 (1.75)	1.798	1.758	2.596	0.469	0.383
2 - (2)	2.039	2.008	2.846	0.469	0.383
2 - 1/4 (2.5)	2.293	2.262	3.345	0.508	0.508
2 - 1/2 (2.5)	2.543	2.512	3.595	0.508	0.508
2 - 3/4 (2.75)	2.793	2.762	4.095	0.633	0.633
3 - (3)	3.043	3.012	4.035	0.633	0.633

Full list of Suppliers of Helical spring-lock washers, inch sizes

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.

Germany

Pfitzer Verbindungstechnik Gmbh

Distributor of inch sized fasteners, oil and gas fasteners and turned special screws

USA

B...

Manufacturer of non-standard flat washers, shims and precision metal stampings, inch sizes for North America market

China

B...

Manufacturer of fasteners, specialized in washers and stampings.

China

D...

Biggest factory in China producing stainless steel washers.

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

Materials: 316L ,316S33,1.4462.

Italy

The portal for fasteners and fixing elements

Suppliers of Helical spring-lock washers, inch sizes

Technical data

Standard ASME B18.21.1 TABLE 1

Standard ASME B18.21.1 TABLE 2

Standard ASME B18.21.1 TABLE 3

Standard ASME B18.21.1 TABLE 4

Details

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

Pfitzer Verbindungstechnik Gmbh

B...

B...

D...

F...

F...

F...

J...

M...

P...

S...

S...

S...

S...

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