SAE Flat Washer, Plated
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SAE Flat Washer, Plated

Plated SAE flat washers are used under bolt heads or nuts to increase the bearing surface area, or to offer protection so that the nut or bolt can be rotated without distortion of the bearing surface. Flat washers are also used to give tightness to a joint, to prevent leakage, and especially to distribute pressure under the head of a bolt or nut. Dimensional specifications are governed by ASME B18.21.1. USS (United States Standard) flat washers have a larger outer diameter than SAE (Society of Automotive Engineers) flat washers, and can be utilized in nearly any application. These fasteners are available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

Governing StandardsSAE Flat Washer

ASME B18.21.1 Covers the dimensional requirements, physical properties, and related test methods for helical spring-lock washers (#0 through 3 inches), tooth-lock washers (#2 through 1 ¼ inches), and plain washers (#0 through 3 inches).

Dimensional SpecificationsSAE Flat Washer

SAE flat washer dimensions
Per ASME B18.21.1-2009
Size Nominal A B C
Inside Diameter Outside Diameter Thickness
Basic Tolerance
Plus
Tolerance
Minus
Basic Tolerance
Plus
Tolerance
Minus
Basic Max Min
1/4 0.2500 0.2810 0.0150 0.0050 0.6250 0.0150 0.0070 0.0650 0.0800 0.0510
5/16 0.3125 0.3440 0.0150 0.0050 0.6880 0.0150 0.0070 0.0650 0.0800 0.0510
3/8 0.3750 0.4060 0.0150 0.0050 0.8120 0.0150 0.0070 0.0650 0.0800 0.0510
7/16 0.4375 0.4690 0.0150 0.0050 0.9220 0.0150 0.0070 0.0650 0.0800 0.0510
1/2 0.5000 0.5310 0.0150 0.0050 1.0620 0.0300 0.0070 0.0950 0.1210 0.0740
9/16 0.5625 0.5940 0.0150 0.0050 1.1560 0.0300 0.0070 0.0950 0.1210 0.0740
5/8 0.6250 0.6560 0.0300 0.0070 1.3120 0.0300 0.0070 0.0950 0.1210 0.0740
3/4 0.7500 0.8120 0.0300 0.0070 1.4690 0.0300 0.0070 0.1340 0.1600 0.1080
7/8 0.8750 0.9380 0.0300 0.0070 1.7500 0.0300 0.0070 0.1340 0.1600 0.1080
1 1.0000 1.0620 0.0300 0.0070 2.0000 0.0300 0.0070 0.1340 0.1600 0.1080
1 1/8 1.1250 1.2500 0.0300 0.0070 2.2500 0.0300 0.0070 0.1340 0.1600 0.1080
1 1/4 1.2500 1.3750 0.0300 0.0070 2.5000 0.0300 0.0070 0.1650 0.1920 0.1360
1 3/8 1.3750 1.5000 0.0300 0.0070 2.7500 0.0300 0.0070 0.1650 0.1920 0.1360
1 1/2 1.5000 1.6250 0.0300 0.0070 3.0000 0.0300 0.0070 0.1650 0.1920 0.1360
  1. All dimensions are in inches.
SAE Flat Washer, Plated
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
1/4 0.2810 0.6250 0.0650 WFPL025SAE In Stock $0.01632/EA EA
5/16 0.3440 0.6880 0.0650 WFPL031SAE In Stock $0.02105/EA EA
3/8 0.4060 0.8120 0.0650 WFPL037SAE In Stock $0.02429/EA EA
7/16 0.4690 0.9220 0.0650 WFPL043SAE In Stock $0.02867/EA EA
1/2 0.5310 1.0620 0.0950 WFPL050SAE In Stock $0.06947/EA EA
9/16 0.5940 1.1560 0.0950 WFPL056SAE In Stock $0.06828/EA EA
5/8 0.6560 1.3120 0.0950 WFPL062SAE In Stock $0.08451/EA EA
3/4 0.8120 1.4690 0.1340 WFPL075SAE In Stock $0.18048/EA EA
7/8 0.9380 1.75 0.1340 WFPL087SAE In Stock $0.17233/EA EA
1 1.0620 2.0 0.1340 WFPL100SAE In Stock $0.2129/EA EA
1 1/8 1.25 2.25 0.1340 WFPL112SAE In Stock $0.48011/EA EA
1 1/4 1.3750 2.5 0.1650 WFPL125SAE In Stock $0.31613/EA EA
1 1/2 1.6250 3.0 0.1650 WFPL150SAE In Stock $0.82469/EA EA