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SAE & USS

TYPE A NARROW (SAE) &
TYPE B WIDE (USS)

USS (United States Standard) and SAE (Society of Automotive Engineers) are two common dimensional standards for steel flat washers. Generally, flat washers made in nonferrous materials do not conform to these standards. In non-steel flat washers, corrosion-resistance rather than strength is usually the big consideration. Additionally, steel is quite a bit cheaper than stainless or a nickel-based alloy. Therefore, standard flat washers in nonferrous materials are only as thick or as wide as needed to be functional.

Nickel Systems can supply non-steel flat washers to USS dimensions. Some of our commercial standard flat washers have an outer diameter equal to an SAE pattern. However, in our experience, most customers will opt for a commercial standard flat washer after learning of the dimensional cost and availability differences.

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Specifications & Technical Data

SAE Dimensions

Size Inside Diameter Outside Diameter Thickness
Base Tolerance Base Tolerance Base Max. Min.
+ – + –
#2 0.094 0.000 0.005 0.250 0.000 0.005 0.020 0.025 0.016
#3 0.109 0.008 0.005 0.250 0.008 0.005 0.032 0.040 0.025
#4 0.125 0.008 0.005 0.312 0.008 0.005 0.032 0.040 0.025
#5 1.145 0.008 0.005 0.286 0.008 0.005 0.032 0.040 0.025
#6 0.156 0.008 0.005 0.375 0.015 0.005 0.049 0.065 0.036
#8 0.188 0.008 0.005 0.438 0.015 0.005 0.049 0.065 0.036
#10 0.219 0.008 0.005 0.500 0.015 0.005 0.049 0.065 0.036
#12 0.250 0.015 0.005 0.562 0.015 0.005 0.065 0.080 0.051
1/4 0.281 0.015 0.005 0.625 0.015 0.005 0.065 0.080 0.051
5/16 0.344 0.015 0.005 0.688 0.015 0.007 0.065 0.080 0.051
3/8 0.406 0.015 0.005 0.812 0.015 0.007 0.065 0.080 0.051
7/16 0.469 0.015 0.005 0.922 0.015 0.007 0.065 0.080 0.051
1/2 0.531 0.015 0.005 1.062 0.030 0.007 0.095 0.121 0.074
9/16 0.594 0.015 0.005 1.156 0.030 0.007 0.095 0.121 0.074
5/8 0.656 0.030 0.007 1.312 0.030 0.007 0.095 0.121 0.074
3/4 0.812 0.030 0.007 1.469 0.030 0.007 0.134 0.160 0.108
7/8 0.938 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108
1 1.062 0.030 0.007 2.000 0.030 0.007 0.134 0.160 0.108
1 1/8 1.250 0.030 0.007 2.250 0.030 0.007 0.0134 0.160 0.108
1 1/4 1.375 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136
1 3/8 1.500 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136
1 1/2 1.625 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136

 

USS Dimensions

Size Inside Diameter Outside Diameter Thickness
Base Tolerance Base Tolerance Base Max. Min.
+ – + –
1/4 0.312 0.015 0.005 0.734 0.015 0.007 0.065 0.080 0.051
5/16 0.375 0.015 0.005 0.875 0.030 0.007 0.083 0.104 0.64
3/8 0.438 0.015 0.005 1.000 0.030 0.007 0.083 0.104 0.064
7/16 0.500 0.015 0.005 1.250 0.030 0.007 0.083 0.104 0.064
1/2 0.562 0.015 0.005 1.375 0.030 0.007 0.109 0.132 0.086
9/16 0.625 0.015 0.005 1.469 0.030 0.007 0.109 0.132 0.086
5/8 0.688 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108
3/4 0.812 0.030 0.007 2.000 0.030 0.007 0.148 0.177 0.122
7/8 0.938 0.030 0.007 2.250 0.030 0.007 0.165 0.192 0.136
1 1.062 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136
1 1/8 1.250 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136
1 1/4 1.375 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136
1 3/8 1.500 0.045 0.010 3.250 0.045 0.010 0.180 0.213 0.153
1 1/2 1.625 0.045 0.010 3.500 0.045 0.010 0.180 0.213 0.153
1 5/8 1.750 0.045 0.010 3.750 0.045 0.010 0.180 0.213 0.153
1 3/4 1.875 0.045 0.010 4.000 0.045 0.010 0.180 0.213 0.153
1 7/8 2.000 0.045 0.010 4.250 0.045 0.010 0.180 0.213 0.153
2 2.125 0.045 0.010 4.500 0.045 0.010 0.180 0.213 0.153
2 1/4 2.375 0.045 0.010 4.750 0.045 0.010 0.220 0.248 0.193
2 1/2 2.625 0.045 0.010 5.000 0.045 0.010 0.238 0.280 0.210
2 3/4 2.875 0.045 0.010 5.250 0.065 0.010 0.259 0.310 0.228
3 3.125 0.045 0.010 5.500 0.065 0.010 0.284 0.327 0.249

 

SAE & USS Specifications

  • STANDARD (ASME/ANSI)
  • METRIC (IFI)

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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

Nickel Systems maintains an inventory of commercial flat washers in Hastelloy® (Alloys C276, C22, B2), Carpenter® 20 (Alloy 20), Duplex 2205, 18-8 and 316 Stainless. Current inventory also includes Inconel® (Alloys 600, 625), 310 Stainless, 316L Stainless, 317L Stainless and Monel® (Alloy 400).

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