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Thru Hardened USS Flat Washer, Plated

Thru-hardened 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. 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 SpecificationsThru Hardened USS 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	1.250	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.

Thru Hardened USS Flat Washer, Plated

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

1/4

0.3120

0.7340

0.0650

WF8P025

In Stock

$0.07807/EA

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1/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.07807/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.07807/ EA
1560	$0.07311/ EA
6240	$0.06519/ EA
28040	$0.04294/ EA

5/16

0.3750

0.8750

0.0830

WF8P031

In Stock

$0.11054/EA

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5/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.11054/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.11054/ EA
1000	$0.10356/ EA
4000	$0.09223/ EA
17970	$0.06112/ EA

3/8

0.4380

1.0000

0.0830

WF8P037

In Stock

$0.10606/EA

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3/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.10606/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.10606/ EA
770	$0.09959/ EA
3080	$0.08905/ EA
13830	$0.05896/ EA

7/16

0.5000

1.2500

0.0830

WF8P043

In Stock

$0.24613/EA

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7/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.24613/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.24613/ EA
480	$0.23089/ EA
1910	$0.20491/ EA
8570	$0.13749/ EA

1/2

0.5620

1.3750

0.1090

WF8P050

In Stock

$0.26705/EA

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1/2 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.26705/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.26705/ EA
260	$0.25068/ EA
1040	$0.22224/ EA
4650	$0.14974/ EA

9/16

0.6250

1.4690

0.1090

WF8P056

In Stock

$0.6682/EA

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9/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.6682/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.6682/ EA
230	$0.62725/ EA
890	$0.55609/ EA
4000	$0.37468/ EA

5/8

0.6880

1.7500

0.1340

WF8P062

In Stock

$0.52436/EA

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5/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.52436/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.52436/ EA
130	$0.49262/ EA
520	$0.43602/ EA
2310	$0.29621/ EA

3/4

0.8120

2.0000

0.1480

WF8P075

In Stock

$0.77447/EA

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3/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$0.77447/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.77447/ EA
100	$0.72807/ EA
400	$0.64387/ EA
1800	$0.43995/ EA

7/8

0.9380

2.2500

0.1650

WF8P087

In Stock

$1.26235/EA

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7/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$1.26235/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.26235/ EA
80	$1.18747/ EA
290	$1.04904/ EA
1310	$0.72211/ EA

1.0625

2.5000

0.1650

WF8P100

In Stock

$1.43672/EA

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1 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$1.43672/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.43672/ EA
60	$1.35254/ EA
240	$1.19387/ EA
1070	$0.8259/ EA

1 1/8

1.2500

2.7500

0.1650

WF8P112

In Stock

$2.07886/EA

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1 1/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$2.07886/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.07886/ EA
60	$1.95906/ EA
210	$1.72861/ EA
910	$1.20645/ EA

1 1/4

1.3750

3.0000

0.1650

WF8P125

In Stock

$2.28901/EA

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1 1/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$2.28901/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.28901/ EA
50	$2.15709/ EA
180	$1.90335/ EA
770	$1.32841/ EA

1 1/2

1.6250

3.5000

0.1800

WF8P150

In Stock

$4.4529/EA

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1 1/2 THRU HARDENED STEEL USS FLAT WASHER, PLATED

$4.4529/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.4529/ EA
40	$4.2008/ EA
130	$3.70391/ EA
570	$2.60596/ EA

Thru Hardened USS Flat Washer, Plated

Technical Data

Governing Standards

Governing StandardsThru Hardened USS Flat Washer

Dimensional Specifications

Dimensional SpecificationsThru Hardened USS Flat Washer

Grade

Diameter

Thickness

Outside Diameter

Inside Diameter

1/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

5/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

3/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

7/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

1/2 THRU HARDENED STEEL USS FLAT WASHER, PLATED

9/16 THRU HARDENED STEEL USS FLAT WASHER, PLATED

5/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

3/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

7/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

1 THRU HARDENED STEEL USS FLAT WASHER, PLATED

1 1/8 THRU HARDENED STEEL USS FLAT WASHER, PLATED

1 1/4 THRU HARDENED STEEL USS FLAT WASHER, PLATED

1 1/2 THRU HARDENED STEEL USS FLAT WASHER, PLATED