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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

In Stock

$0.06015/EA

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1/4 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.06015/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.06015/EA
1540	$0.05633/EA
6160	$0.05023/EA
27720	$0.03309/EA

5/16

0.3750

0.8750

0.0830

WFGA031

In Stock

$0.06706/EA

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5/16 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.06706/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.06706/EA
840	$0.06283/EA
3330	$0.05595/EA
14950	$0.03708/EA

3/8

0.4380

1.0000

0.0830

WFGA037

In Stock

$0.08053/EA

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3/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.08053/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.08053/EA
650	$0.07562/EA
2580	$0.06762/EA
11600	$0.04477/EA

7/16

0.5000

1.2500

0.0830

WFGA043

In Stock

$0.20625/EA

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7/16 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.20625/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.20625/EA
400	$0.19348/EA
1600	$0.17171/EA
7200	$0.11521/EA

1/2

0.5620

1.3750

0.1090

WFGA050

In Stock

$0.16686/EA

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1/2 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.16686/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.16686/EA
260	$0.15663/EA
1030	$0.13886/EA
4610	$0.09356/EA

9/16

0.6250

1.4690

0.1090

WFGA056

In Stock

$0.35162/EA

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9/16 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.35162/EA

Qty

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

In Stock

$0.31326/EA

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5/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.31326/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.31326/EA
130	$0.2943/EA
520	$0.26048/EA
2310	$0.17696/EA

3/4

0.8120

2.0000

0.1480

WFGA075

In Stock

$0.41031/EA

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3/4 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.41031/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.41031/EA
90	$0.38572/EA
360	$0.34111/EA
1610	$0.23308/EA

7/8

0.9380

2.2500

0.1650

WFGA087

In Stock

$0.6373/EA

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7/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.6373/EA

Qty

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

In Stock

$0.93654/EA

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1 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.93654/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.93654/EA
60	$0.88167/EA
220	$0.77824/EA
960	$0.53838/EA

1 1/8

1.2500

2.7500

0.1650

WFGA112

In Stock

$0.79355/EA

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1 1/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$0.79355/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.79355/EA
50	$0.74782/EA
190	$0.65985/EA
820	$0.46053/EA

1 1/4

1.3750

3.0000

0.1650

WFGA125

In Stock

$1.04462/EA

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1 1/4 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$1.04462/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.04462/EA
40	$0.98442/EA
160	$0.86862/EA
690	$0.60624/EA

1 3/8

1.5000

3.2500

0.1800

WFGA137

In Stock

$1.22988/EA

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1 3/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$1.22988/EA

Qty

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

In Stock

$1.71213/EA

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1 1/2 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$1.71213/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.71213/EA
30	$1.6152/EA
100	$1.42415/EA
500	$1.00199/EA

1 5/8

1.7500

3.7500

0.1800

WFGA162

In Stock

$3.99706/EA

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1 5/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$3.99706/EA

Qty

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

In Stock

$6.01168/EA

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1 3/4 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$6.01168/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.01168/EA
25	$5.67132/EA
80	$5.00049/EA
500	$3.51819/EA

1 7/8

2.0000

4.2500

0.1800

WFGA187

In Stock

$5.53382/EA

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1 7/8 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$5.53382/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.53382/EA
25	$5.22052/EA
70	$4.60301/EA
500	$3.23854/EA

2.1250

4.5000

0.1800

WFGA200

In Stock

$3.51337/EA

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2 LOW CARBON STEEL USS FLAT WASHER, GALVANIZED

$3.51337/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.51337/EA
25	$3.31446/EA
70	$2.92241/EA
500	$2.05612/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).