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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.

Products
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

In Stock

$0.01023/EA

See Quantity Discounts

#6 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.01023/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.01023/ EA
3710	$0.00957/ EA
14820	$0.00856/ EA
59260	$0.00559/ EA

0.1880

0.4380

0.0490

WFPL 8

In Stock

$0.02085/EA

See Quantity Discounts

#8 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.02085/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.02085/ EA
2770	$0.01951/ EA
11050	$0.01744/ EA
44200	$0.0114/ EA

#10

0.2190

0.5000

0.0490

WFPL 10

In Stock

$0.05229/EA

See Quantity Discounts

#10 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.05229/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05229/ EA
1340	$0.04891/ EA
5330	$0.04372/ EA
21290	$0.02857/ EA

#12

0.2500

0.5620

0.0650

WFPL 12

In Stock

$0.03515/EA

See Quantity Discounts

#12 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.03515/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.03515/ EA
1340	$0.03288/ EA
5340	$0.02939/ EA
21330	$0.01921/ EA

1/4

0.3120

0.7340

0.0650

WFPL025

In Stock

$0.03487/EA

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1/4 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.03487/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.03487/ EA
1540	$0.03265/ EA
6160	$0.02912/ EA
27720	$0.01918/ EA

5/16

0.3750

0.8750

0.0830

WFPL031

In Stock

$0.05179/EA

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5/16 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.05179/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.05179/ EA
840	$0.04851/ EA
3330	$0.04321/ EA
14950	$0.02863/ EA

3/8

0.4380

1.0000

0.0830

WFPL037

3-5 Working Days

$0.07132/EA

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3/8 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.07132/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.07132/ EA
650	$0.06697/ EA
2580	$0.05988/ EA
11600	$0.03965/ EA

7/16

0.5000

1.2500

0.0830

WFPL043

In Stock

$0.15625/EA

See Quantity Discounts

7/16 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.15625/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.15625/ EA
400	$0.14657/ EA
1600	$0.13008/ EA
7200	$0.08728/ EA

1/2

0.5620

1.3750

0.1090

WFPL050

In Stock

$0.15204/EA

See Quantity Discounts

1/2 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.15204/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.15204/ EA
270	$0.14272/ EA
1050	$0.12653/ EA
4720	$0.08525/ EA

9/16

0.6250

1.4690

0.1090

WFPL056

In Stock

$0.46801/EA

See Quantity Discounts

9/16 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.46801/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.46801/ EA
230	$0.43933/ EA
920	$0.38948/ EA
4110	$0.26242/ EA

5/8

0.6880

1.7500

0.1340

WFPL062

In Stock

$0.29546/EA

See Quantity Discounts

5/8 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.29546/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.29546/ EA
130	$0.27757/ EA
520	$0.24568/ EA
2310	$0.16691/ EA

3/4

0.8120

2.0000

0.1480

WFPL075

In Stock

$0.47436/EA

See Quantity Discounts

3/4 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.47436/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.47436/ EA
90	$0.44594/ EA
360	$0.39437/ EA
1610	$0.26947/ EA

7/8

0.9380

2.2500

0.1650

WFPL087

3-5 Working Days

$0.64035/EA

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7/8 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.64035/EA

Qty

3-5 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$0.64035/ EA
70	$0.60237/ EA
270	$0.53215/ EA
1180	$0.3663/ EA

1.0625

2.5000

0.1650

WFPL100

In Stock

$0.72006/EA

See Quantity Discounts

1 LOW CARBON STEEL USS FLAT WASHER, PLATED

$0.72006/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.72006/ EA
60	$0.67787/ EA
220	$0.59835/ EA
960	$0.41393/ EA

1 1/8

1.2500

2.7500

0.1650

WFPL112

In Stock

$0.9336/EA

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

$0.9336/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.9336/ EA
50	$0.8798/ EA
190	$0.77631/ EA
820	$0.54181/ EA

1 1/4

1.3750

3.0000

0.1650

WFPL125

In Stock

$1.29556/EA

See Quantity Discounts

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

$1.29556/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.29556/ EA
40	$1.2209/ EA
160	$1.07728/ EA
690	$0.75187/ EA

1 3/8

1.5000

3.2500

0.1800

WFPL137

In Stock

$6.1167/EA

See Quantity Discounts

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

$6.1167/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.1167/ EA
30	$5.7704/ EA
120	$5.08785/ EA
530	$3.57965/ EA

1 1/2

1.6250

3.5000

0.1800

WFPL150

In Stock

$1.60323/EA

See Quantity Discounts

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

$1.60323/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.60323/ EA
30	$1.51246/ EA
100	$1.33356/ EA
500	$0.93825/ EA

1 3/4

1.8750

4.0000

0.1800

WFPL175

In Stock

$1.69677/EA

See Quantity Discounts

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

$1.69677/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.69677/ EA
25	$1.60071/ EA
80	$1.41137/ EA
500	$0.99299/ EA

1 7/8

2.0000

4.2500

0.1800

WFPL187

In Stock

$1.35104/EA

See Quantity Discounts

1 7/8 LOW CARBON USS FLAT WASHER, PLATED

$1.35104/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.35104/ EA
25	$1.27455/ EA
70	$1.12379/ EA
500	$0.79067/ EA

2.1250

4.5000

0.1800

WFPL200

In Stock

$2.78079/EA

See Quantity Discounts

2 LOW CARBON STEEL USS FLAT WASHER, PLATED

$2.78079/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.78079/ EA
25	$2.62335/ EA
70	$2.31305/ EA
500	$1.62739/ EA

2 1/4

2.3750

4.7500

0.2200

WFPL225

In Stock

$1.89172/EA

See Quantity Discounts

2 1/4 LOW CARBON USS FLAT WASHER, PLATED

$1.89172/EA

Qty

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

In Stock

$3.07593/EA

See Quantity Discounts

3 LOW CARBON USS FLAT WASHER, PLATED

$3.07593/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.07593/ EA
40	$2.90178/ EA
70	$2.55855/ EA
140	$1.80011/ EA

USS Flat Washer, Plated

Technical Data

Governing Standards

Governing StandardsUSS Flat Washer

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

Grade

Diameter

Thickness

Outside Diameter

Inside Diameter

#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).