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USS Flat Washer

Low carbon USS 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. ASTM F844 covers the standard specifications for unhardened steel flat washers for general use.

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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

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

1/4

0.3120

0.7340

0.0650

WFBL025

3733 In Stock

$0.03981/EA

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1/4 Low Carbon Steel USS Flat Washer

$0.03981/EA

Qty

3733 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.03981/EA
1540	$0.03728/EA
6160	$0.03324/EA
27720	$0.0219/EA

5/16

0.3750

0.8750

0.0830

WFBL031

2015 In Stock

$0.04475/EA

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5/16 Low Carbon Steel USS Flat Washer

$0.04475/EA

Qty

2015 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04475/EA
840	$0.04192/EA
3330	$0.03733/EA
14950	$0.02474/EA

3/8

0.4380

1.0000

0.0830

WFBL037

3720 In Stock

$0.09789/EA

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3/8 Low Carbon Steel USS Flat Washer

$0.09789/EA

Qty

3720 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.09789/EA
650	$0.09191/EA
2580	$0.08218/EA
11600	$0.05441/EA

7/16

0.5000

1.2500

0.0830

WFBL043

1790 In Stock

$0.2523/EA

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7/16 Low Carbon Steel USS Flat Washer

$0.2523/EA

Qty

1790 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.2523/EA
400	$0.23668/EA
1600	$0.21005/EA
7200	$0.14093/EA

1/2

0.5620

1.3750

0.1090

WFBL050

978 In Stock

$0.13276/EA

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1/2 Low Carbon Steel USS Flat Washer

$0.13276/EA

Qty

978 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.13276/EA
260	$0.12462/EA
1030	$0.11048/EA
4610	$0.07444/EA

9/16

0.6250

1.4690

0.1090

WFBL056

5286 In Stock

$0.10741/EA

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9/16 Low Carbon Steel USS Flat Washer

$0.10741/EA

Qty

5286 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.10741/EA
230	$0.10083/EA
920	$0.08939/EA
4110	$0.06023/EA

5/8

0.6880

1.7500

0.1340

WFBL062

429 In Stock

$0.25151/EA

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5/8 Low Carbon Steel USS Flat Washer

$0.25151/EA

Qty

429 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.25151/EA
130	$0.23628/EA
520	$0.20914/EA
2310	$0.14208/EA

3/4

0.8120

2.0000

0.1480

WFBL075

977 In Stock

$0.51846/EA

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3/4 Low Carbon Steel USS Flat Washer

$0.51846/EA

Qty

977 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.51846/EA
90	$0.4874/EA
360	$0.43103/EA
1610	$0.29452/EA

7/8

0.9380

2.2500

0.1650

WFBL087

387 In Stock

$0.52816/EA

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7/8 Low Carbon Steel USS Flat Washer

$0.52816/EA

Qty

387 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.52816/EA
70	$0.49683/EA
270	$0.43892/EA
1180	$0.30213/EA

1.0625

2.5000

0.1650

WFBL100

364 In Stock

$0.61245/EA

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1 Low Carbon Steel USS Flat Washer

$0.61245/EA

Qty

364 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.61245/EA
60	$0.57656/EA
220	$0.50893/EA
960	$0.35207/EA

1 1/8

1.2500

2.7500

0.1650

WFBL112

192 In Stock

$0.68323/EA

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1 1/8 Low Carbon Steel USS Flat Washer

$0.68323/EA

Qty

192 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.68323/EA
50	$0.64386/EA
190	$0.56812/EA
820	$0.39651/EA

1 1/4

1.3750

3.0000

0.1650

WFBL125

204 In Stock

$0.99257/EA

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1 1/4 Low Carbon Steel USS Flat Washer

$0.99257/EA

Qty

204 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.99257/EA
40	$0.93537/EA
160	$0.82534/EA
690	$0.57603/EA

1 3/8

1.5000

3.2500

0.1800

WFBL137

227 In Stock

$1.0697/EA

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1 3/8 Low Carbon Steel USS Flat Washer

$1.0697/EA

Qty

227 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.0697/EA
30	$1.00914/EA
120	$0.88977/EA
530	$0.62602/EA

1 1/2

1.6250

3.5000

0.1800

WFBL150

80 In Stock

$2.21748/EA

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1 1/2 Low Carbon Steel USS Flat Washer

$2.21748/EA

Qty

80 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.21748/EA
30	$2.09194/EA
100	$1.84449/EA
500	$1.29773/EA

1 5/8

1.7500

3.7500

0.1800

WFBL162

97 In Stock

$1.56624/EA

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1 5/8 Low Carbon Steel USS Flat Washer

$1.56624/EA

Qty

97 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.56624/EA
25	$1.47757/EA
90	$1.30279/EA
500	$0.91661/EA

1 3/4

1.8750

4.0000

0.1800

WFBL175

47 In Stock

$3.10822/EA

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1 3/4 Low Carbon Steel USS Flat Washer

$3.10822/EA

Qty

47 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.10822/EA
25	$2.93225/EA
80	$2.5854/EA
500	$1.81901/EA

1 7/8

2.0000

4.2500

0.1800

WFBL187

66 In Stock

$2.83855/EA

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1 7/8 Low Carbon Steel USS Flat Washer

$2.83855/EA

Qty

66 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.83855/EA
25	$2.67785/EA
70	$2.3611/EA
500	$1.66119/EA

2.1250

4.5000

0.1800

WFBL200

73 In Stock

$3.88933/EA

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2 Low Carbon Steel USS Flat Washer

$3.88933/EA

Qty

73 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.88933/EA
25	$3.66914/EA
70	$3.23513/EA
500	$2.27614/EA

2 1/4

2.3750

4.7500

0.2200

WFBL225

5 In Stock

$2.68102/EA

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2 1/4 Low Carbon Steel USS Flat Washer

$2.68102/EA

Qty

5 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.68102/EA
25	$2.52923/EA
50	$2.23006/EA
500	$1.569/EA

2 1/2

2.6250

5.0000

0.2380

WFBL250

51 In Stock

$5.47818/EA

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2 1/2 Low Carbon Steel USS Flat Washer

$5.47818/EA

Qty

51 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.47818/EA
40	$5.16803/EA
80	$4.55673/EA
180	$3.20597/EA

3.1250

5.5000

0.2840

WFBL300

20 In Stock

$5.18591/EA

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3 Low Carbon Steel USS Flat Washer

$5.18591/EA

Qty

20 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.18591/EA
40	$4.89231/EA
70	$4.31362/EA
140	$3.03493/EA

USS Flat Washer

Technical Data

Governing Standards

Governing StandardsUSS Flat Washer

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

Category

Outside Diameter

Diameter

Grade

Inside Diameter

Thickness

1/4 Low Carbon Steel USS Flat Washer

5/16 Low Carbon Steel USS Flat Washer

3/8 Low Carbon Steel USS Flat Washer

7/16 Low Carbon Steel USS Flat Washer

1/2 Low Carbon Steel USS Flat Washer

9/16 Low Carbon Steel USS Flat Washer

5/8 Low Carbon Steel USS Flat Washer

3/4 Low Carbon Steel USS Flat Washer

7/8 Low Carbon Steel USS Flat Washer

1 Low Carbon Steel USS Flat Washer

1 1/8 Low Carbon Steel USS Flat Washer

1 1/4 Low Carbon Steel USS Flat Washer

1 3/8 Low Carbon Steel USS Flat Washer

1 1/2 Low Carbon Steel USS Flat Washer

1 5/8 Low Carbon Steel USS Flat Washer

1 3/4 Low Carbon Steel USS Flat Washer

1 7/8 Low Carbon Steel USS Flat Washer

2 Low Carbon Steel USS Flat Washer

2 1/4 Low Carbon Steel USS Flat Washer

2 1/2 Low Carbon Steel USS Flat Washer

3 Low Carbon Steel USS 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).