USS/SAE/Fender Washers Dimensions Reference Guide

Washers Dimentions Reference Guide

You can use our reference tables shown below to find standard dimensions related to the type of washers you are looking for.

USS Washers

Bolt Size	Outside Diameter			Inside Diameter			Thickness
Bolt Size	Nom.	Max	Min	Nom.	Max	Min	American Standard (Gauge)	Max	Min
3/16 (#10)	9/16	0.593	0.531	1/4	0.281	0.250	18 (3/64)	0.65	0.36
1/4	3/4	0.781	0.719	5/16	0.343	0.312	16 (1/16)	0.80	0.51
5/16	7/8	0.906	0.84	3/8	0.406	0.375	14 (5/64)	0.104	0.64
3/8	1	1.031	0.969	7/16	0.469	0.438	14 (5/64)	104	0.064
7/16	1 1/4	1.281	1.219	1/2	0.531	0.500	14 (5/64)	0.104	0.64
1/2	1 3/8	1.406	1.344	9/16	0.593	0.562	12 (7/64)	0.132	0.86
9/16	1 1/2	1.531	1.469	5/8	0.656	0.625	21 (7/64)	0.132	0.86
5/8	1 3/4	1.781	1.719	11/16	0.719	0.688	10 (9/64)	0.160	0.108
3/4	2	2.031	1.969	13/16	0.843	0.812	9 (5/32)	0.177	0.122
7/8	2 1/4	2.281	2.219	15/16	0.969	0.938	8 (11/64)	0.192	0.136
1	2 1/2	2.531	2.469	1 1/16	1.094	1.063	8 (11/64)	0.192	0.136
1 1/8	2 3/4	2.781	2.719	1 1/4	1.281	1.250	8 (11/64)	0.192	0.136
1 1/4	3	3.031	2.929	1 3/8	1.406	1.375	8 (11/64)	0.192	0.136
1 3/8	3 1/4	3.281	3.219	1 1/2	1.531	1.500	7 (3/16)	0.213	0.153
1 1/2	3 1/2	3.631	3.469	1 5/8	1.656	1.625	7 (3/16)	0.213	0.153
1 5/8	3 3/4	3.813	3.687	1 3/4	1.813	1.750	7 (3/16)	0.213	0.153
1 3/4	4	4.063	3.937	1 7/8	1.938	1.875	7 (3/16)	0.213	0.153
1 7/8	4 1/4	4.313	4.187	2	2.063	2.000	7 (3/16)	0.213	0.153
2	4 1/2	4.563	4.437	2 1/8	2.188	2.125	7 (3/16)	0.213	0.153
2 1/4	4 3/4	4.813	4.687	2 3/8	2.438	2.375	5 (7/32)	0.248	0.193
2 1/2	5	5.063	4.937	2 5/8	2.688	2.625	4 (15/64)	0.280	0.210
2 3/4	5 1/4	5.313	5.187	2 7/8	2.938	2.875	3 (1/4)	0.310	0.228
3	5 1/2	5.563	5.437	3 1/8	3.188	3.125	2 (5/32)	0.327	0.249

A thin, flat, circular steel part with a centrally located hole.

Washers are designed for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it’s attached. Flat washers are used to improve stress distribution, and to span large clearance holes. USS washers are designed to meet the majority of industrial applications in manufacturing, maintenance and repair.

SAE Washers

Bolt Size	Outside Diameter			Inside Diameter			Thickness			Average Qty per 50 Lbs
Bolt Size	Nom.	Max	Min	Nom.	Max	Min	American Standard (Gauge)	Max	Min	Average Qty per 50 Lbs
#6	3/8	0.406	0.344	5/32	0.187	0.156	18 (3/64)	0.065	0.036	39,500
#8	7/16	0.469	0.407	3/16	0.219	0.188	18 (3/64)	0.065	0.036	29,500
#10	1/2	0.531	0.469	7/32	0.250	0.219	18 (3/64)	0.065	0.036	22,750
#12	9/16	0.583	0.531	1/4	0.281	0.250	16 (1/16)	0.080	0.051	14,700
1/4	5/8	0.656	0.594	9/32	0.312	0.281	15 (1/16)	0.080	0.051	11,100
5/16	11/16	0.719	0.657	11/32	0.375	0.344	16 (1/16)	0.080	0.051	9,750
3/8	13/16	0.843	0.781	13/32	0.437	0.406	16 (1/16)	0.080	0.051	7,000
7/16	59/64	0.953	0.891	15/32	0.500	0.469	16 (1/16)	0.080	0.051	5,500
1/2	1 1/16	1.093	1.031	17/32	0.562	0.531	13 (3/32)	0.121	0.074	2,800
9/16	1 3/16	1.219	1.157	19/32	0.625	0.594	13 (3/32)	0.121	0.074	2,250
5/8	1 5/16	1.343	1.281	21/32	0.687	0.656	13 (3/32)	0.121	0.074	8,850
3/4	1 1/2	1.531	1.469	13/16	0.843	0.812	10 (9/64)	0.160	0.108	1,050
7/8	1 3/4	1.871	1.719	15/16	0.969	0.938	10 (9/64)	0.160	0.108	775
1	2	2.031	1.969	1 1/16	1.094	1.062	10 (9/64)	0.160	0.108	585
1 1/8	2 1/4	2.313	2.187	1 3/16	1.251	1.188	10 (9/64)	0.160	0.108	460
1 1/4	2 1/2	2.563	2.437	1 5/16	1.375	1.312	9 (5/32)	0.192	0.136	335
1 3/8	2 3/4	2.813	2.687	1 7/16	1.501	1.438	9 (5/32)	0.213	0.136	275
1 1/2	3	2.8063	2.937	1 9/16	1.625	1.562	9 (5/32)	0.213	0.153	230

Similar to a USS washer, but with a slightly smaller inside and outside diameters. Also, most but not all SAE washers are made from thinner materials than USS washers.

SAE washers were designed to serve similar purposes as the USS washers, but specifically to meet the requirements in the fields of automotive engineering.

F436 Washers

Bolt Sizes^D	A	B	C		Weight in Pounds Per 1000 Pieces
	Outside Diameter	Inside Diameter	Thickness
	Outside Diameter	Inside Diameter	Min	Max
1/2	1 1/16	17/32	0.097	0.177	20
5/8	1 5/16	11/16	0.122	0.177	35
3/4	1 15/32	13/16	0.122	0.177	41.20
7/8	1 3/4	15/16	0.136	0.177	71
1	2	1 1/16	0.136	0.177	93.80
1 1/8	2 1/4	1 3/16	0.136	0.177	120
1 1/4	2 1/2	1 3/8	0.136	0.177	144
1 3/8	2 3/4	1 1/2	0.136	0.177	174
1 1/2	3	1 5/8	0.136	0.177	208
1 5/8	3 1/4	1 3/4	0.178	0.28	311
1 3/4	3 3/8	1 7/8	0.178^B	0.28^B	328
1 7/8	3 1/2	2	0.178^B	0.28^B	345
2	3 3/4	2 1/8	0.178^C	0.28^C	398
2 1/4	4	2 3/8	0.24^C	0.34^C	568
2 1/2	4 1/2	2 5/8	0.24^C	0.34^C	734
2 3/4	5	2 7/8	0.24^C	0.34^C	921
3	5 1/2	3 1/8	0.24^C	0.34^C	1129
3 1/4	6	3 3/8	0.24^C	0.34^C	1350
3 1/2	6 1/2	3 5/8	0.24^C	0.34^C	1633
3 3/4	7	3 7/8	0.24^C	0.34^C	1880
4	7 1/2	4 1/8	0.24^C	0.34^C	2280

^B 3⁄16 in. nominal.
^C 1⁄4 in. nominal
^D"Bolt sizes", also known as "Nominal washer sizes" are intended for use with fasteners of the same nominal thread size.

Source: The table above is inspired by Table 2 from the ASTM F436 Standard that you can purchase on the ASTM Website

Fender Washers

Bolt Size	Inside Diameter	Outside Diameter	Thickness		Average Qty per 50 Lbs
Bolt Size	Inside Diameter	Outside Diameter	Max	Min	Average Qty per 50 Lbs
10 (3/16 Small)	7/32	1	0.08	0.051	3,500
10 (3/16 Large)	7/32	1 1/4	0.08	0.051	....
1/4 Very Small)	9/32	1	0.08	0.051	3,750
1/4 (Small)	9/32	1 1/4	0.08	0.051	2,300
1/4 (Large)	9/32	1 1/2	0.08	0.051	1,550
5/16 (Small)	11/32	1 1/4	0.08	0.051	2,400
5/16 (Large)	11/32	1 1/2	0.08	0.051	1,600
3/8 (Small)	13/32	1 1/4	0.08	0.051	2,350
3/8 (Regular)	13/32	1 1/2	0.08	0.051	1,650
3/8 (Extra Large)	27/64	1 5/8	0.08	0.051	....
1/2 (Regular)	13/32	2	0.08	0.051	950

A flat washer with significantly more surface area than a USS or SAE washer. They are also made from a thinner gauge metal than most flat washers.

Used where an extra wide bearing sufrace is required. Originally designed for auto body repair work, they are also used in sheet metal, plumbing, and electrical work. Also used to attach signs to posts, to install drywall and wood paneling.

Washers Dimentions Reference Guide

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