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Uss Flat Washer, Galvanized

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 structural ASTM F436 flat washers, and can be utilized in nearly any application. ASTM F844 covers the standard specifications for unhardened steel flat washers for general use. Hot dip galvanizing provides a highly corrosion resistant finish, made of sacrificial zinc.

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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, Galvanized

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

1/4

0.3120

0.7340

0.0650

WFGA025

8269 In Stock

$0.04768/EA

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1/4 Low Carbon Steel Uss Flat Washer, Galvanized

$0.04768/EA

Qty

8269 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.04768/EA
1540	$0.04465/EA
6160	$0.03981/EA
27720	$0.02623/EA

5/16

0.3750

0.8750

0.0830

WFGA031

7393 In Stock

$0.06567/EA

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5/16 Low Carbon Steel Uss Flat Washer, Galvanized

$0.06567/EA

Qty

7393 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.06567/EA
840	$0.06152/EA
3330	$0.05479/EA
14950	$0.03631/EA

3/8

0.4380

1.0000

0.0830

WFGA037

7749 In Stock

$0.08205/EA

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3/8 Low Carbon Steel Uss Flat Washer, Galvanized

$0.08205/EA

Qty

7749 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.08205/EA
650	$0.07704/EA
2580	$0.06889/EA
11600	$0.04561/EA

7/16

0.5000

1.2500

0.0830

WFGA043

3-5 Working Days

$0.16926/EA

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7/16 Low Carbon Steel Uss Flat Washer, Galvanized

$0.16926/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.16926/EA
400	$0.15878/EA
1600	$0.14091/EA
7200	$0.09455/EA

1/2

0.5620

1.3750

0.1090

WFGA050

7402 In Stock

$0.16436/EA

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1/2 Low Carbon Steel Uss Flat Washer, Galvanized

$0.16436/EA

Qty

7402 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16436/EA
260	$0.15429/EA
1030	$0.13678/EA
4610	$0.09216/EA

9/16

0.6250

1.4690

0.1090

WFGA056

825 In Stock

$0.35162/EA

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9/16 Low Carbon Steel Uss Flat Washer, Galvanized

$0.35162/EA

Qty

825 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.35162/EA
50	$0.33034/EA
180	$0.29238/EA
790	$0.19863/EA

5/8

0.6880

1.7500

0.1340

WFGA062

5407 In Stock

$0.37449/EA

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5/8 Low Carbon Steel Uss Flat Washer, Galvanized

$0.37449/EA

Qty

5407 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.37449/EA
130	$0.35182/EA
520	$0.3114/EA
2310	$0.21155/EA

3/4

0.8120

2.0000

0.1480

WFGA075

659 In Stock

$0.52232/EA

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3/4 Low Carbon Steel Uss Flat Washer, Galvanized

$0.52232/EA

Qty

659 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.52232/EA
90	$0.49103/EA
360	$0.43424/EA
1610	$0.29671/EA

7/8

0.9380

2.2500

0.1650

WFGA087

8577 In Stock

$0.6373/EA

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7/8 Low Carbon Steel Uss Flat Washer, Galvanized

$0.6373/EA

Qty

8577 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.6373/EA
230	$0.5995/EA
920	$0.52961/EA
4110	$0.36456/EA

1.0625

2.5000

0.1650

WFGA100

656 In Stock

$0.89068/EA

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1 Low Carbon Steel Uss Flat Washer, Galvanized

$0.89068/EA

Qty

656 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.89068/EA
60	$0.83849/EA
220	$0.74013/EA
960	$0.51201/EA

1 1/8

1.2500

2.7500

0.1650

WFGA112

291 In Stock

$0.79768/EA

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1 1/8 Low Carbon Steel Uss Flat Washer, Galvanized

$0.79768/EA

Qty

291 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.79768/EA
50	$0.75171/EA
190	$0.66329/EA
820	$0.46293/EA

1 1/4

1.3750

3.0000

0.1650

WFGA125

376 In Stock

$1.46089/EA

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1 1/4 Low Carbon Steel Uss Flat Washer, Galvanized

$1.46089/EA

Qty

376 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.46089/EA
40	$1.37669/EA
160	$1.21475/EA
690	$0.84782/EA

1 3/8

1.5000

3.2500

0.1800

WFGA137

96 In Stock

$1.22988/EA

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1 3/8 Low Carbon Steel Uss Flat Washer, Galvanized

$1.22988/EA

Qty

96 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.22988/EA
30	$1.16025/EA
120	$1.02301/EA
530	$0.71976/EA

1 1/2

1.6250

3.5000

0.1800

WFGA150

105 In Stock

$3.32495/EA

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1 1/2 Low Carbon Steel Uss Flat Washer, Galvanized

$3.32495/EA

Qty

105 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.32495/EA
30	$3.13671/EA
100	$2.76568/EA
500	$1.94585/EA

1 5/8

1.7500

3.7500

0.1800

WFGA162

242 In Stock

$3.99706/EA

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1 5/8 Low Carbon Steel Uss Flat Washer, Galvanized

$3.99706/EA

Qty

242 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.99706/EA
25	$3.77077/EA
90	$3.32474/EA
500	$2.33919/EA

1 3/4

1.8750

4.0000

0.1800

WFGA175

38 In Stock

$6.81327/EA

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1 3/4 Low Carbon Steel Uss Flat Washer, Galvanized

$6.81327/EA

Qty

38 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.81327/EA
25	$6.42754/EA
80	$5.66725/EA
500	$3.98731/EA

1 7/8

2.0000

4.2500

0.1800

WFGA187

193 In Stock

$4.74612/EA

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1 7/8 Low Carbon Steel Uss Flat Washer, Galvanized

$4.74612/EA

Qty

193 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.74612/EA
25	$4.47742/EA
70	$3.9478/EA
500	$2.77755/EA

2.1250

4.5000

0.1800

WFGA200

51 In Stock

$3.51354/EA

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2 Low Carbon Steel Uss Flat Washer, Galvanized

$3.51354/EA

Qty

51 In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.51354/EA
25	$3.31462/EA
70	$2.92254/EA
500	$2.05621/EA

Uss Flat Washer, Galvanized

Technical Data

Governing Standards

Governing StandardsUSS Flat Washer

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

Grade

Diameter

Thickness

Outside Diameter

Inside Diameter

1/4 Low Carbon Steel Uss Flat Washer, Galvanized

5/16 Low Carbon Steel Uss Flat Washer, Galvanized

3/8 Low Carbon Steel Uss Flat Washer, Galvanized

7/16 Low Carbon Steel Uss Flat Washer, Galvanized

1/2 Low Carbon Steel Uss Flat Washer, Galvanized

9/16 Low Carbon Steel Uss Flat Washer, Galvanized

5/8 Low Carbon Steel Uss Flat Washer, Galvanized

3/4 Low Carbon Steel Uss Flat Washer, Galvanized

7/8 Low Carbon Steel Uss Flat Washer, Galvanized

1 Low Carbon Steel Uss Flat Washer, Galvanized

1 1/8 Low Carbon Steel Uss Flat Washer, Galvanized

1 1/4 Low Carbon Steel Uss Flat Washer, Galvanized

1 3/8 Low Carbon Steel Uss Flat Washer, Galvanized

1 1/2 Low Carbon Steel Uss Flat Washer, Galvanized

1 5/8 Low Carbon Steel Uss Flat Washer, Galvanized

1 3/4 Low Carbon Steel Uss Flat Washer, Galvanized

1 7/8 Low Carbon Steel Uss Flat Washer, Galvanized

2 Low Carbon Steel Uss Flat Washer, Galvanized

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).