This product is regulated by the following standards:

ASME B18.21.1 TABLE 11 ASME B18.21.1 TABLE 12 ASME B18.21.1 TABLE 13

Technical data

Standard ASME B18.21.1 TABLE 11

The Type A plain washers covered in this Standard are intended for general application. The type A plain washers serve to minimize embedding and to aid tightening.

Dimensions in inches : source: ASME B18.21.1 type A Plain Washers table 11 Publication date 2009
Nominal Washer Size	Series	A basic	B basic	C basic
No. 0 (0.60)	-	0.078	0.188	0.020
No.2 (0.086)	-	0.094	0.250	0.020
No.4 (0.112)	-	0.125	0.312	0.032
No.6 (0.138)	-	0.156	0.375	0.049
No.8 (0.164)	-	0.188	0.438	0.049
No. 10 (0.190)	-	0.219	0.500	0.049
3/16 (0.188)	-	0.250	0.562	0.049
No. 12 (0.216)	-	0.250	0.562	0.65
1/4	N	0.281	0.625	0.065
1/4	W	0.312	0.734	0.065
5/16	N	0.344	0.688	0.065
5/16	W	0.375	0.875	0.083
3/8	N	0.406	0.812	0.065
3/8	W	0.438	1.000	0.083
7/16	N	0.469	0.922	0.065
7/16	W	0.500	1.250	0.083
1/2	N	0.531	0.030	0.095
1/2	W	0.562	1.375	0.109
9/16	N	0.594	1.156	0.095
9/16	W	0.625	1.469	0.109
5/8	N	0.656	1.312	0.095
5/8	W	0.688	1.750	0.134
3/4	N	0.812	1.469	0.134
3/4	W	0.812	2.000	0.148
7/8	N	0.938	1.750	0.134
7/8	W	0.938	2.250	0.165
1	N	1.062	2.000	0.134
1	W	1.062	2.500	0.165
1-1/8	N	1.250	2.250	0.134
1-1/8	W	1.250	2.750	0.165
1-1/4	N	1.375	2.500	0.165
1-1/4	W	1.375	3.000	0.165
1-3/8	N	1.500	2.750	0.165
1-3/8	W	1.500	3.250	0.180
1-1/2	N	1.625	3.000	0.165
1-1/2	W	1.625	3.500	0.180
1-5/8	-	1.750	3.750	0.180
1-3/4	-	1.875	4.000	0.180
1-7/8	-	2.000	4.250	0.180
2	-	2.125	4.500	0.180
2-1/4	-	2.375	4.750	0.220
2-1/2	-	2.625	5.000	0.238
2-3/4	-	2.875	5.250	0.259
3	-	3.125	5.500	0.284

Standard ASME B18.21.1 TABLE 12

Plain washers type B

Dimensions in inches : source: ASME B18.21.1 type B Plain Washers table 12
Nominal Washer Size	Series	A basic	B basic	C basic
No. 0 (0.060)	N	0.068	0.125	0.025
	R	0.068	0.188	0.025
	W	0.068	0.25	0.025
No. 1 (0.073	N	0.84	0.156	0.025
	R	0.84	0.219	0.025
	W	0.84	0.281	0.025
No. 2 (0.086)	N	0.094	0.188	0.025
	R	0.094	0.250	0.032
	W	0.094	0.344	0.032
No. 3 (0.99)	N	0.109	0.219	0.025
	R	0.109	0.312	0.032
	W	0.109	0.406	0.040
No. 4 (0.112)	N	0.125	0.250	0.032
	R	0.125	0.375	0.040
	W	0.125	0.438	0.040
No. 5 (0.125)	N	0.141	0.281	0.032
	R	0.141	0.406	0.040
	W	0.141	0.500	0.040
No. 6 (0.138)	N	0.156	0.312	0.032
	R	0.156	0.438	0.040
	W	0.156	0.562	0.040
No. 8 (0.164)	N	0.188	0.375	0.040
	R	0.188	0.500	0.040
	W	0.188	0.625	0.063
No. 10 (0.190)	N	0.203	0.406	0.040
	R	0.203	0.562	0.040
	W	0.203	0.734	0.063
No. 12 (0.206)	N	0.234	0.438	0.040
	R	0.234	0.625	0.063
	W	0.234	0.875	0.063
1/4	N	0.281	0.500	0.063
	R	0.281	0.734	0.063
	W	0.281	1	0.063
5/16	N	0.344	0.625	0.063
	R	0.344	0.875	0.063
	W	0.344	1.125	0.063
3/8	N	0.406	0.734	0.063
	R	0.406	1	0.063
	W	0.406	1.250	0.100
7/16	N	0.469	0.875	0.063
	R	0.469	1.125	0.063
	W	0.469	1.469	0.100
1/2	N	0.531	1	0.063
	R	0.531	1.250	0.100
	W	0.531	1.750	0.100
9/16	N	0.594	1.125	0.063
	R	0.594	1.469	0.100
	W	0.594	2	0.100
5/8	N	0.656	1.250	0.100
	R	0.656	1.750	0.100
	W	0.656	2.250	0.160
3/4	N	0.812	1.375	0.100
	R	0.812	2	0.100
	W	0.812	2.500	0.160
7/8	N	0.938	1.469	0.100
	R	0.938	2.250	0.160
	W	0.938	2.750	0.160
1	N	1.062	1.750	0.100
	R	1.062	2.500	0.160
	W	1.062	3	0.160
1-1/8	N	1.188	2	0.100
	R	1.188	2.750	0.160
	W	1.188	3.250	0.160
1-1/4	N	1.312	2.250	0.160
	R	1.312	3	0.160
	W	1.312	3.500	0.250
1-3/8	N	1.438	2.500	0.160
	R	1.438	3.250	0.160
	W	1.438	3.750	0.250
1-1/2	N	1.562	0.030	0.160
	R	1.562	0.045	0.250
	W	1.562	0.045	0.250
1-5/8	N	1.750	3	0.160
	R	1.750	3.750	0.250
	W	1.750	4.250	0.250
1-3/4	N	1.875	3.250	0.160
	R	1.875	4	0.250
	W	1.875	4.500	0.250
1-7/8	N	2	3.500	0.250
	R	2	4.250	0.250
	W	2	4.750	0.250
2	N	2.125	3.750	0.250
	R	2.125	3.750	0.250
	W	2.125	3.750	0.250
2-1/4	N	2.375	4	0.250
	R	2.375	5	0.250
	W	2.375	5	0.250
2-1/2	N	2.625	4.500	0.250
	R	2.625	5.500	0.375
	W	2.625	6	0.375
2-3/4	N	2.875	5	0.250
	R	2.875	6	0.375
	W	2.875	5.500	0.375
3	N	3.125	5.500	0.375
	R	3.125	6.500	0.375
	W	3.125	7	0.375

Standard ASME B18.21.1 TABLE 13

Fender Washers

Dimensions in inches : source: ASME B18.21.1 Fender Washers table 13
Nominal Washer Size	A basic	B basic	C basic
1/8 x 5/8	0.16	0.625	0.065
1/8 x 3/4	0.16	0.75	0.065
5/32 x 7/8	0.19	0.875	0.065
3/16 x 3/4	0.19	0.75	0.065
3/16 x 1	0.190	1	0.065
3/16 x 1-1/4	0.19	1.25	0.065
3/16 x 1-1/2	0.19	1.5	0.065
1/4 x 1	0.285	1	0.065
1/4 x 1-1/4	0.285	1.25	0.065
1/4 x 1-1/2	0.285	1.5	0.065
1/4 x 1-3/4	0.285	1.761	0.065
1/4 x 2	0.285	2	0.065
5/16 x 7/8	0.348	0.875	0.065
5/16 x 1	0.348	1	0.065
5/16 x 1-1/4	0.348	1.25	0.065
5/16 x 1-1/2	0.348	0.338	0.065
5/16 x 1-3/4	0.348	1.75	0.065
5/16 x 1-5/8	0.348	1.625	0.065
5/16 x 2	0.348	2	0.065
3/8 x 1-1/4	0.410	1.250	0.065
3/8 x 1-1/2	0.410	1.5	0.065
3/8 x1-3/4	0.410	1.75	0.065
3/8 1-5/8	0.410	1.625	0.065
3/8 x 2	0.410	2	0.065
1/2 x 1-1/4	0.535	1.25	0.065
1/2 x 1-1/2	0.535	1.5	0.065
1/2 x 1-3/4	0.535	0.75	0.065
1/2 x 2	0.535	2	0.065
1/2 x 2-1/2	0.535	2.5	0.065

Flat washers, inch series

Dimensions in inches : source: ASME B18.21.1 type A Plain Washers table 11
Nominal Washer Size	Series	A basic	B basic	C basic
No. 0 (0.60)	-	0.078	0.188	0.020
No.2 (0.086)	-	0.094	0.250	0.020
No.4 (0.112)	-	0.125	0.312	0.032
No.6 (0.138)	-	0.156	0.375	0.049
No.8 (0.164)	-	0.188	0.438	0.049
No. 10 (0.190)	-	0.219	0.500	0.049
3/16 (0.188)	-	0.250	0.562	0.049
No. 12 (0.216)	-	0.250	0.562	0.65
1/4	N	0.281	0.625	0.065
1/4	W	0.312	0.734	0.065
5/16	N	0.344	0.688	0.065
5/16	W	0.375	0.875	0.083
3/8	N	0.406	0.812	0.065
3/8	W	0.438	1.000	0.083
7/16	N	0.469	0.922	0.065
7/16	W	0.500	1.250	0.083
1/2	N	0.531	0.030	0.095
1/2	W	0.562	1.375	0.109
9/16	N	0.594	1.156	0.095
9/16	W	0.625	1.469	0.109
5/8	N	0.656	1.312	0.095
5/8	W	0.688	1.750	0.134
3/4	N	0.812	1.469	0.134
3/4	W	0.812	2.000	0.148
7/8	N	0.938	1.750	0.134
7/8	W	0.938	2.250	0.165
1	N	1.062	2.000	0.134
1	W	1.062	2.500	0.165
1-1/8	N	1.250	2.250	0.134
1-1/8	W	1.250	2.750	0.165
1-1/4	N	1.375	2.500	0.165
1-1/4	W	1.375	3.000	0.165
1-3/8	N	1.500	2.750	0.165
1-3/8	W	1.500	3.250	0.180
1-1/2	N	1.625	3.000	0.165
1-1/2	W	1.625	3.500	0.180
1-5/8	-	1.750	3.750	0.180
1-3/4	-	1.875	4.000	0.180
1-7/8	-	2.000	4.250	0.180
2	-	2.125	4.500	0.180
2-1/4	-	2.375	4.750	0.220
2-1/2	-	2.625	5.000	0.238
2-3/4	-	2.875	5.250	0.259
3	-	3.125	5.500	0.284


Dimensions in inches : source: ASME B18.21.1 type B Plain Washers table 12
Nominal Washer Size	Series	A basic	B basic	C basic
No. 0 (0.060)	N	0.068	0.125	0.025
	R	0.068	0.188	0.025
	W	0.068	0.25	0.025
No. 1 (0.073	N	0.84	0.156	0.025
	R	0.84	0.219	0.025
	W	0.84	0.281	0.025
No. 2 (0.086)	N	0.094	0.188	0.025
	R	0.094	0.250	0.032
	W	0.094	0.344	0.032
No. 3 (0.99)	N	0.109	0.219	0.025
	R	0.109	0.312	0.032
	W	0.109	0.406	0.040
No. 4 (0.112)	N	0.125	0.250	0.032
	R	0.125	0.375	0.040
	W	0.125	0.438	0.040
No. 5 (0.125)	N	0.141	0.281	0.032
	R	0.141	0.406	0.040
	W	0.141	0.500	0.040
No. 6 (0.138)	N	0.156	0.312	0.032
	R	0.156	0.438	0.040
	W	0.156	0.562	0.040
No. 8 (0.164)	N	0.188	0.375	0.040
	R	0.188	0.500	0.040
	W	0.188	0.625	0.063
No. 10 (0.190)	N	0.203	0.406	0.040
	R	0.203	0.562	0.040
	W	0.203	0.734	0.063
No. 12 (0.206)	N	0.234	0.438	0.040
	R	0.234	0.625	0.063
	W	0.234	0.875	0.063
1/4	N	0.281	0.500	0.063
	R	0.281	0.734	0.063
	W	0.281	1	0.063
5/16	N	0.344	0.625	0.063
	R	0.344	0.875	0.063
	W	0.344	1.125	0.063
3/8	N	0.406	0.734	0.063
	R	0.406	1	0.063
	W	0.406	1.250	0.100
7/16	N	0.469	0.875	0.063
	R	0.469	1.125	0.063
	W	0.469	1.469	0.100
1/2	N	0.531	1	0.063
	R	0.531	1.250	0.100
	W	0.531	1.750	0.100
9/16	N	0.594	1.125	0.063
	R	0.594	1.469	0.100
	W	0.594	2	0.100
5/8	N	0.656	1.250	0.100
	R	0.656	1.750	0.100
	W	0.656	2.250	0.160
3/4	N	0.812	1.375	0.100
	R	0.812	2	0.100
	W	0.812	2.500	0.160
7/8	N	0.938	1.469	0.100
	R	0.938	2.250	0.160
	W	0.938	2.750	0.160
1	N	1.062	1.750	0.100
	R	1.062	2.500	0.160
	W	1.062	3	0.160
1-1/8	N	1.188	2	0.100
	R	1.188	2.750	0.160
	W	1.188	3.250	0.160
1-1/4	N	1.312	2.250	0.160
	R	1.312	3	0.160
	W	1.312	3.500	0.250
1-3/8	N	1.438	2.500	0.160
	R	1.438	3.250	0.160
	W	1.438	3.750	0.250
1-1/2	N	1.562	0.030	0.160
	R	1.562	0.045	0.250
	W	1.562	0.045	0.250
1-5/8	N	1.750	3	0.160
	R	1.750	3.750	0.250
	W	1.750	4.250	0.250
1-3/4	N	1.875	3.250	0.160
	R	1.875	4	0.250
	W	1.875	4.500	0.250
1-7/8	N	2	3.500	0.250
	R	2	4.250	0.250
	W	2	4.750	0.250
2	N	2.125	3.750	0.250
	R	2.125	3.750	0.250
	W	2.125	3.750	0.250
2-1/4	N	2.375	4	0.250
	R	2.375	5	0.250
	W	2.375	5	0.250
2-1/2	N	2.625	4.500	0.250
	R	2.625	5.500	0.375
	W	2.625	6	0.375
2-3/4	N	2.875	5	0.250
	R	2.875	6	0.375
	W	2.875	5.500	0.375
3	N	3.125	5.500	0.375
	R	3.125	6.500	0.375
	W	3.125	7	0.375


Dimensions in inches : source: ASME B18.21.1 Fender Washers table 13
Nominal Washer Size	A basic	B basic	C basic
1/8 x 5/8	0.16	0.625	0.065
1/8 x 3/4	0.16	0.75	0.065
5/32 x 7/8	0.19	0.875	0.065
3/16 x 3/4	0.19	0.75	0.065
3/16 x 1	0.190	1	0.065
3/16 x 1-1/4	0.19	1.25	0.065
3/16 x 1-1/2	0.19	1.5	0.065
1/4 x 1	0.285	1	0.065
1/4 x 1-1/4	0.285	1.25	0.065
1/4 x 1-1/2	0.285	1.5	0.065
1/4 x 1-3/4	0.285	1.761	0.065
1/4 x 2	0.285	2	0.065
5/16 x 7/8	0.348	0.875	0.065
5/16 x 1	0.348	1	0.065
5/16 x 1-1/4	0.348	1.25	0.065
5/16 x 1-1/2	0.348	0.338	0.065
5/16 x 1-3/4	0.348	1.75	0.065
5/16 x 1-5/8	0.348	1.625	0.065
5/16 x 2	0.348	2	0.065
3/8 x 1-1/4	0.410	1.250	0.065
3/8 x 1-1/2	0.410	1.5	0.065
3/8 x1-3/4	0.410	1.75	0.065
3/8 1-5/8	0.410	1.625	0.065
3/8 x 2	0.410	2	0.065
1/2 x 1-1/4	0.535	1.25	0.065
1/2 x 1-1/2	0.535	1.5	0.065
1/2 x 1-3/4	0.535	0.75	0.065
1/2 x 2	0.535	2	0.065
1/2 x 2-1/2	0.535	2.5	0.065

Full list of Suppliers of Flat washers, inch series

The Type A plain washers covered in this Standard are intended for general application. The type A plain washers serve to minimize embedding and to aid tightening.

USA

MW Industries, Inc.

Manufacturer of metal stampings and washers for the North American market

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.

USA

Andre Corporation

Manufacturer of flat washers, belleville disc springs, spacers and special stampings for north America market

USA

BOKER'S INC.

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

China

BSC CORPORATION LTD

Manufacturer of fasteners, specialized in washers and stampings.

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.

Earnest Machine

Distributor of fasteners

Italy

FASTENAL EUROPE SRL

We offer logistics and inventory management and integrated supply chain management services covering a wide market of OEM fasteners (KanBan), MRO and Personal Protective Equipment (Vending Machine).