18-8 SS Fender Washer
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18-8 SS Fender Washer

18-8 stainless fender washers are flat washers with a larger outer diameter in proportion to its center hole. Used where an extra wide bearing surface is required. 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. Fender washers were originally designed for auto body repair work, they are also used in sheet metal, plumbing, and electrical work. Also used to attach signs to posts, to install drywall and wood paneling. Stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. Stainless steel has a higher corrosion resistance than carbon steel.

Governing StandardsFender Washer

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).

Dimensional SpecificationsFender Washer

Fender washer dimensions
Per ASME B18.21.1-2009
Full Size A B C
Inside
Diameter
Outside
Diameter
Mean Section
Thickness
#6 X 5/8 0.1490 0.6250 0.0310
#8 X 3/4 0.1740 0.7500 0.0400
#10 X 11/16 0.2030 0.6875 0.0400
#10 X 3/4 0.2030 0.7500 0.0400
#10 X 1 0.2030 1.0000 0.0400
1/4 X 11/16 0.2810 0.6875 0.0500
1/4 X 1 0.2810 1.0000 0.0500
1/4 X 1 1/4 0.2810 1.2500 0.0500
1/4 X 1 1/2 0.2810 1.5000 0.0620
1/4 X 2 0.2810 2.0000 0.0620
5/16 X 1 0.3430 1.0000 0.0500
5/16 X 1 1/4 0.3430 1.2500 0.0500
5/16 X 1 1/2 0.3430 1.5000 0.0620
5/16 X 2 0.3430 2.0000 0.0620
3/8 X 1 0.4060 1.0000 0.0500
3/8 X 1 1/4 0.4060 1.2500 0.0500
3/8 X 1 1/2 0.4060 1.5000 0.0620
3/8 X 2 0.4060 2.0000 0.0620
1/2 X 1 1/2 0.5310 1.5000 0.0620
1/2 X 2 0.5310 2.0000 0.0620
  1. All dimensions are in inches.
18-8 SS Fender Washer
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#8 0.17 0.75 0.04 WFFS 80075 3-5 Working Days $0.21496/EA EA
#10 0.2030 1.0 0.04 WFFS 100100 In Stock $0.10286/EA EA
1/4 0.2810 1.0 0.05 WFFS0250100 In Stock $0.09301/EA EA
1/4 0.2810 1.25 0.05 WFFS0250125 In Stock $0.1452/EA EA
1/4 0.2810 1.5 0.0620 WFFS0250150 In Stock $0.28202/EA EA
5/16 0.34 1.25 0.05 WFFS0310125 3-5 Working Days $0.34642/EA EA
5/16 0.3430 1.5 0.0620 WFFS0310150 In Stock $0.37813/EA EA
3/8 0.4060 1.25 0.05 WFFS0370125 In Stock $0.12653/EA EA
3/8 0.4060 1.5 0.0620 WFFS0370150 In Stock $0.22641/EA EA
3/8 0.4060 2.0 0.0620 WFFS0370200 In Stock $0.50863/EA EA
1/2 0.5310 1.5 0.0620 WFFS0500150 In Stock $0.267/EA EA
1/2 0.5310 2.0 0.0620 WFFS0500200 In Stock $0.43396/EA EA