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USS Flat Washer, Plated
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USS Flat Washer, Plated

USS Flat Washer, Plated

Low carbon USS flat washers, typically used with Grade 8 or hardened steel bolting, 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. ASTM F844 covers the standard specifications for unhardened steel flat washers for general use. Available in zinc plated finish. Zinc plating sacrifices itself, corroding before the base material, offering added corrosion resistance.

Governing StandardsUSS Flat Washer

ASTM F844 Covers standard, unhardened steel washers for general use.
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).

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Dimensional SpecificationsUSS Flat Washer

USS Flat Washer dimensions
Per ASME B18.21.1-2009
Size Nominal A B C
Inside Diameter Outside Diameter Mean Section Thickness
Basic Tolerance
Plus		 Tolerance
Minus		 Basic Tolerance
Plus		 Tolerance
Minus		 Basic Max Min
#6 0.1380 0.1560 0.0080 0.0050 0.3750 0.0150 0.0050 0.0490 0.0650 0.0360
#8 0.1640 0.1880 0.0080 0.0050 0.4380 0.0150 0.0050 0.0490 0.0650 0.0360
#10 0.1900 0.2190 0.0080 0.0050 0.5000 0.0150 0.0050 0.0490 0.0650 0.0360
#12 0.2160 0.2500 0.0150 0.0050 0.5620 0.0150 0.0050 0.0650 0.0800 0.0510
1/4 0.2500 0.3120 0.0150 0.0050 0.7340 0.0150 0.0070 0.0650 0.0800 0.0510
5/16 0.3125 0.3750 0.0150 0.0050 0.8750 0.0300 0.0070 0.0830 0.1040 0.0640
3/8 0.3750 0.4380 0.0150 0.0050 1.0000 0.0300 0.0070 0.0830 0.1040 0.0640
7/16 0.4375 0.5000 0.0150 0.0050 1.2500 0.0300 0.0070 0.0830 0.1040 0.0640
1/2 0.5000 0.5620 0.0150 0.0050 1.3750 0.0300 0.0070 0.1090 0.1320 0.0860
9/16 0.5625 0.6250 0.0150 0.0050 1.4690 0.0300 0.0070 0.1090 0.1320 0.0860
5/8 0.6250 0.6880 0.0300 0.0070 1.7500 0.0300 0.0070 0.1340 0.1600 0.1080
3/4 0.7500 0.8120 0.0300 0.0070 2.0000 0.0300 0.0070 0.1480 0.1770 0.1220
7/8 0.8750 0.9380 0.0300 0.0070 2.2500 0.0300 0.0070 0.1650 0.1920 0.1360
1 1.0000 1.2500 0.0300 0.0070 2.5000 0.0300 0.0070 0.1650 0.1920 0.1360
1 1/8 1.1250 1.3750 0.0300 0.0070 2.7500 0.0300 0.0070 0.1650 0.1920 0.1360
1 1/4 1.2500 1.3750 0.0300 0.0070 3.0000 0.0300 0.0070 0.1650 0.1920 0.1360
1 3/8 1.3750 1.5000 0.0450 0.0100 3.2500 0.0450 0.1000 0.1800 0.2130 0.1530
1 1/2 1.5000 1.6250 0.0450 0.0100 3.5000 0.0450 0.0100 0.1800 0.2130 0.1530
1 5/8 1.6250 1.7500 0.0450 0.0100 3.7500 0.0450 0.0100 0.1800 0.2130 0.1530
1 3/4 1.7500 1.8750 0.0450 0.0100 4.0000 0.0450 0.0100 0.1800 0.2130 0.1530
1 7/8 1.8750 2.0000 0.0450 0.0100 4.2500 0.0450 0.0100 0.1800 0.2130 0.1530
2 2.0000 2.1250 0.0450 0.0100 4.5000 0.0450 0.0100 0.1800 0.2130 0.1530
2 1/4 2.2500 2.3750 0.0450 0.0100 4.7500 0.0450 0.0100 0.2200 0.2480 0.1930
2 1/2 2.5000 2.6250 0.0450 0.0100 5.0000 0.0450 0.0100 0.2380 0.2800 0.2100
2 3/4 2.7500 2.8750 0.0650 0.0100 5.2500 0.0650 0.0100 0.2590 0.3100 0.2280
3 3.0000 3.1250 0.0650 0.0100 5.5000 0.0650 0.0100 0.2840 0.3270 0.2490
  1. All dimensions are in inches.
USS Flat Washer, Plated
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#6 0.1560 0.3750 0.0490 WFPL 6 In Stock $0.01023/EA EA
#8 0.1880 0.4380 0.0490 WFPL 8 In Stock $0.01252/EA EA
#10 0.2190 0.5 0.0490 WFPL 10 In Stock $0.05466/EA EA
#12 0.25 0.5620 0.0650 WFPL 12 In Stock $0.03519/EA EA
1/4 0.3120 0.7340 0.0650 WFPL025 In Stock $0.03148/EA EA
5/16 0.3750 0.8750 0.0830 WFPL031 In Stock $0.05541/EA EA
3/8 0.4380 1.0 0.0830 WFPL037 In Stock $0.05556/EA EA
7/16 0.5 1.25 0.0830 WFPL043 In Stock $0.11148/EA EA
1/2 0.5620 1.3750 0.1090 WFPL050 In Stock $0.13998/EA EA
9/16 0.6250 1.4690 0.1090 WFPL056 In Stock $0.14213/EA EA
5/8 0.6880 1.75 0.1340 WFPL062 In Stock $0.37091/EA EA
3/4 0.8120 2.0 0.1480 WFPL075 In Stock $0.41792/EA EA
7/8 0.9380 2.25 0.1650 WFPL087 In Stock $0.48254/EA EA
1 1.25 2.5 0.1650 WFPL100 In Stock $0.67497/EA EA
1 1/8 1.3750 2.75 0.1650 WFPL112 In Stock $0.82056/EA EA
1 1/4 1.3750 3.0 0.1650 WFPL125 In Stock $0.86341/EA EA
1 3/8 1.5 3.25 0.18 WFPL137 In Stock $1.05662/EA EA
1 1/2 1.6250 3.5 0.18 WFPL150 In Stock $0.93731/EA EA
1 5/8 2.0 4.25 0.18 WFPL187 In Stock $1.35104/EA EA
1 3/4 1.8750 4.0 0.18 WFPL175 In Stock $1.71298/EA EA
2 2.1250 4.5 0.18 WFPL200 In Stock $3.47648/EA EA
2 1/4 2.3750 4.75 0.22 WFPL225 In Stock $1.89172/EA EA
3 3.1250 5.5 0.2840 WFPL300 In Stock $3.07642/EA EA