USS Flat Washer
SAE Flat Washer
Machine Screw Washer
Fender Washer
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USS, SAE, Machine Screw, & Fender Washers |
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USS Flat Washer |
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Description |
A thin, flat, circular steel part with a centrally located hole. |
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Applications / Advantages |
Washers are designed for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it is 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. |
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Material |
Plain washers shall be punched from hot-rolled, hot-rolled and pickled, or cold-rolled steel, or shall be machined for bar stock or tubing, or may be forged at the manufacturers option. |
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SAE Flat Washer |
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Description |
Similar to USS washer, but with slightly smaller inside and outside diameters. Also, most but not all SAE washers are made from thinner materials than USS washers. |
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Applications / Advantages |
SAE washers were designated to serve similar purposes as the USS washers, but specifically to meet the requirements in the field of automotive engineering. |
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Material |
Plain washers shall be punched from hot-rolled and pickled, or cold-rolled steel, or shall be machined from bar stock or tubing, or may be forged at the manufacturer’s option. |
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Machine Screw Flat Washer |
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Description |
The smallest type of flat washer with an outside diameter equal to slightly twice the size of the inside diameter. |
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Applications / Advantages |
Designed for use with machine screws in general industrial applications. |
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Material |
Washers are punched from cold-rolled steel. |
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Fender Washer |
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Description |
A flat washer with significantly more surface area than a USS or SAE washer. They are also made from a thinner gauge steel than most flat washers |
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Applications / Advantages |
Used where an extra wide bearing surface 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. |
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Material |
Washers shall be punched from hot-rolled, hot-roller and pickled or cold-rolled steel, or shall be machined from bar stock or tubing, or may be forged at the manufacturers option. |
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SIZE |
INSIDE |
OUTSIDE |
THICKNESS |
APPROX. |
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SAE FLAT WASHERS |
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#6 |
5/32" |
3/8" |
3/64" |
790 |
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#8 |
3/16" |
7/16" |
3/64" |
590 |
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#10 |
7/32" |
1/2" |
3/64" |
435 |
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1/4 |
9/32" |
5/8" |
1/16" |
222 |
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5/16 |
11/32" |
11/16" |
1/16" |
192 |
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3/8 |
13/32" |
13/16" |
1/16" |
140 |
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7/16 |
15/32" |
59/64" |
1/16" |
105 |
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1/2 |
17/32" |
1-1/16" |
3/32" |
55 |
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9/16 |
19/32" |
1-3/16" |
3/32" |
45 |
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5/8 |
21/32" |
1-5/16" |
3/32" |
36 |
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3/4 |
13/16" |
1-1/2" |
9/64" |
21 |
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7/8 |
15/16" |
1-3/4" |
9/64" |
16 |
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1" |
1-1/16" |
2" |
9/64" |
12 |
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1-1/8 |
1-3/16" |
2-1/4" |
9/64" |
9.2 |
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1-1/4 |
1-5/16" |
2-1/2" |
5/32" |
6.3 |
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1-1/2 |
1-7/16" |
3" |
3/16" |
4.25 |
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USS FLAT WASHERS |
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3/16 |
1/4" |
9/16" |
3/64" |
362 |
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1/4 |
5/16" |
3/4" |
1/16" |
149 |
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5/16 |
3/8" |
7/8" |
5/64" |
90 |
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3/8 |
7/16" |
1" |
5/64" |
67 |
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7/16 |
1/2" |
1-1/4" |
5/64" |
41 |
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1/2 |
9/16" |
1-3/8" |
7/64" |
26 |
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9/16 |
5/8" |
1-1/2" |
7/64" |
22 |
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5/8 |
11/16" |
1-3/4" |
9/64" |
13 |
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3/4 |
13/16" |
2" |
5/32" |
9.1 |
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7/8 |
15/16" |
2-1/4" |
11/64" |
6.5 |
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1" |
1-1/16" |
2-1/2" |
11/64" |
5.3 |
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1-1/8 |
1-1/4" |
2-3/4" |
11/64" |
4.5 |
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1-1/4 |
1-3/8" |
3" |
11/64" |
3.8 |
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1-3/8 |
1-1/2" |
3-1/4" |
3/16" |
3.0 |
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1-1/2 |
1-5/8" |
3-1/2" |
3/16" |
2.6 |
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1-5/8 |
1-3/4" |
3-3/4" |
3/16" |
2.34 |
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1-3/4 |
1-7/8" |
4" |
3/16" |
2.0 |
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1-7/8 |
2" |
4-1/4" |
3/16" |
1.77 |
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2" |
2-1/8" |
4-1/2" |
3/16" |
1.59 |
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2-1/2 |
2-5/8" |
5" |
15/64" |
1.04 |
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3" |
3-1/8" |
5-1/2" |
9/32" |
.078 |
