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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.

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Governing Standards
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

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
		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	1.0625	0.0300	0.0070	2.5000	0.0300	0.0070	0.1650	0.1920	0.1360
1 1/8	1.1250	1.2500	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

All dimensions are in inches.

USS Flat Washer, Plated

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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM

0.1560

0.3750

0.0490

WFPL 6

1657 In Stock

$0.01015/EA

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#6 Low Carbon Steel USS Flat Washer, Plated

$0.01015/EA

Qty

1657 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.01015/EA
3710	$0.00949/EA
14820	$0.00848/EA
59260	$0.00555/EA

0.1880

0.4380

0.0490

WFPL 8

4964 In Stock

$0.01606/EA

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#8 Low Carbon Steel USS Flat Washer, Plated

$0.01606/EA

Qty

4964 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.01606/EA
2770	$0.01502/EA
11050	$0.01343/EA
44200	$0.00878/EA

#10

0.2190

0.5000

0.0490

WFPL 10

3487 In Stock

$0.05246/EA

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#10 Low Carbon Steel USS Flat Washer, Plated

$0.05246/EA

Qty

3487 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05246/EA
1340	$0.04907/EA
5330	$0.04386/EA
21290	$0.02867/EA

#12

0.2500

0.5620

0.0650

WFPL 12

1066 In Stock

$0.03502/EA

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#12 Low Carbon Steel USS Flat Washer, Plated

$0.03502/EA

Qty

1066 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.03502/EA
1340	$0.03275/EA
5340	$0.02928/EA
21330	$0.01914/EA

1/4

0.3120

0.7340

0.0650

WFPL025

11132 In Stock

$0.0293/EA

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1/4 Low Carbon Steel USS Flat Washer, Plated

$0.0293/EA

Qty

11132 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.0293/EA
1540	$0.02744/EA
6160	$0.02447/EA
27720	$0.01612/EA

5/16

0.3750

0.8750

0.0830

WFPL031

7086 In Stock

$0.05554/EA

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5/16 Low Carbon Steel USS Flat Washer, Plated

$0.05554/EA

Qty

7086 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05554/EA
840	$0.05203/EA
3330	$0.04633/EA
14950	$0.0307/EA

3/8

0.4380

1.0000

0.0830

WFPL037

2629 In Stock

$0.05868/EA

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3/8 Low Carbon Steel USS Flat Washer, Plated

$0.05868/EA

Qty

2629 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05868/EA
650	$0.05509/EA
2580	$0.04926/EA
11600	$0.03262/EA

7/16

0.5000

1.2500

0.0830

WFPL043

2315 In Stock

$0.20719/EA

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7/16 Low Carbon Steel USS Flat Washer, Plated

$0.20719/EA

Qty

2315 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.20719/EA
400	$0.19436/EA
1600	$0.17249/EA
7200	$0.11573/EA

1/2

0.5620

1.3750

0.1090

WFPL050

3427 In Stock

$0.15595/EA

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1/2 Low Carbon Steel USS Flat Washer, Plated

$0.15595/EA

Qty

3427 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.15595/EA
270	$0.1464/EA
1050	$0.12979/EA
4720	$0.08745/EA

9/16

0.6250

1.4690

0.1090

WFPL056

661 In Stock

$0.22902/EA

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9/16 Low Carbon Steel USS Flat Washer, Plated

$0.22902/EA

Qty

661 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.22902/EA
230	$0.21498/EA
920	$0.19059/EA
4110	$0.12842/EA

5/8

0.6880

1.7500

0.1340

WFPL062

1597 In Stock

$0.28182/EA

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5/8 Low Carbon Steel USS Flat Washer, Plated

$0.28182/EA

Qty

1597 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.28182/EA
130	$0.26477/EA
520	$0.23434/EA
2310	$0.1592/EA

3/4

0.8120

2.0000

0.1480

WFPL075

2168 In Stock

$0.37476/EA

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3/4 Low Carbon Steel USS Flat Washer, Plated

$0.37476/EA

Qty

2168 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37476/EA
90	$0.35231/EA
360	$0.31157/EA
1610	$0.21289/EA

7/8

0.9380

2.2500

0.1650

WFPL087

212 In Stock

$0.54205/EA

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7/8 Low Carbon Steel USS Flat Washer, Plated

$0.54205/EA

Qty

212 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.54205/EA
70	$0.5099/EA
270	$0.45046/EA
1180	$0.31007/EA

1.0625

2.5000

0.1650

WFPL100

132 In Stock

$0.66168/EA

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1 Low Carbon Steel USS Flat Washer, Plated

$0.66168/EA

Qty

132 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.66168/EA
60	$0.62291/EA
220	$0.54984/EA
960	$0.38037/EA

1 1/8

1.2500

2.7500

0.1650

WFPL112

297 In Stock

$0.80827/EA

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1 1/8 Low Carbon Steel USS Flat Washer, Plated

$0.80827/EA

Qty

297 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.80827/EA
50	$0.76168/EA
190	$0.67209/EA
820	$0.46907/EA

1 1/4

1.3750

3.0000

0.1650

WFPL125

187 In Stock

$1.03968/EA

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1 1/4 Low Carbon Steel USS Flat Washer, Plated

$1.03968/EA

Qty

187 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.03968/EA
40	$0.97977/EA
160	$0.86452/EA
690	$0.60337/EA

1 3/8

1.5000

3.2500

0.1800

WFPL137

151 In Stock

$1.78392/EA

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1 3/8 Low Carbon Steel USS Flat Washer, Plated

$1.78392/EA

Qty

151 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.78392/EA
30	$1.68292/EA
120	$1.48386/EA
530	$1.044/EA

1 1/2

1.6250

3.5000

0.1800

WFPL150

86 In Stock

$1.89172/EA

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1 1/2 Low Carbon Steel USS Flat Washer, Plated

$1.89172/EA

Qty

86 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.89172/EA
30	$1.78462/EA
100	$1.57352/EA
500	$1.10708/EA

1 3/4

1.8750

4.0000

0.1800

WFPL175

120 In Stock

$1.69168/EA

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1 3/4 Low Carbon Steel USS Flat Washer, Plated

$1.69168/EA

Qty

120 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.69168/EA
25	$1.59591/EA
80	$1.40714/EA
500	$0.99002/EA

1 7/8

2.0000

4.2500

0.1800

WFPL187

40 In Stock

$3.83072/EA

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1 7/8 Low Carbon USS Flat Washer, Plated

$3.83072/EA

Qty

40 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.83072/EA
25	$3.61385/EA
70	$3.18638/EA
500	$2.24184/EA

2.1250

4.5000

0.1800

WFPL200

131 In Stock

$3.62733/EA

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2 Low Carbon Steel USS Flat Washer, Plated

$3.62733/EA

Qty

131 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.62733/EA
25	$3.42197/EA
70	$3.0172/EA
500	$2.12281/EA

2 1/4

2.3750

4.7500

0.2200

WFPL225

2 In Stock

$1.89172/EA

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2 1/4 Low Carbon USS Flat Washer, Plated

$1.89172/EA

Qty

2 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.89172/EA
25	$1.78462/EA
50	$1.57352/EA
500	$1.10708/EA

3.1250

5.5000

0.2840

WFPL300

7 In Stock

$3.07521/EA

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3 Low Carbon USS Flat Washer, Plated

$3.07521/EA

Qty

7 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.07521/EA
40	$2.90111/EA
70	$2.55795/EA
140	$1.79969/EA

USS Flat Washer, Plated

Technical Data

Governing Standards

Governing StandardsUSS Flat Washer

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

Category

Outside Diameter

Diameter

Grade

Inside Diameter

Thickness

#6 Low Carbon Steel USS Flat Washer, Plated

#8 Low Carbon Steel USS Flat Washer, Plated

#10 Low Carbon Steel USS Flat Washer, Plated

#12 Low Carbon Steel USS Flat Washer, Plated

1/4 Low Carbon Steel USS Flat Washer, Plated

5/16 Low Carbon Steel USS Flat Washer, Plated

3/8 Low Carbon Steel USS Flat Washer, Plated

7/16 Low Carbon Steel USS Flat Washer, Plated

1/2 Low Carbon Steel USS Flat Washer, Plated

9/16 Low Carbon Steel USS Flat Washer, Plated

5/8 Low Carbon Steel USS Flat Washer, Plated

3/4 Low Carbon Steel USS Flat Washer, Plated

7/8 Low Carbon Steel USS Flat Washer, Plated

1 Low Carbon Steel USS Flat Washer, Plated

1 1/8 Low Carbon Steel USS Flat Washer, Plated

1 1/4 Low Carbon Steel USS Flat Washer, Plated

1 3/8 Low Carbon Steel USS Flat Washer, Plated

1 1/2 Low Carbon Steel USS Flat Washer, Plated

1 3/4 Low Carbon Steel USS Flat Washer, Plated

1 7/8 Low Carbon USS Flat Washer, Plated

2 Low Carbon Steel USS Flat Washer, Plated

2 1/4 Low Carbon USS Flat Washer, Plated

3 Low Carbon USS Flat Washer, Plated

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).