316 SS Flat Washer
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316 SS Flat Washer

316 stainless steel 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. 316 stainless steel fasteners are commonly used in applications that require general atmospheric corrosion resistance, such as chemical and food processing equipment. 316 stainless steel has a higher corrosion resistance than 18-8 or 304 stainless steel.

Governing Standards316 Stainless Steel Flat 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 Specifications316 Stainless Steel Flat Washer

316 stainless steel flat washer dimensions
Per ASME B18.21.1-2009
Size Nominal A B C
Inside
Diameter
Outside
Diameter
Mean Section
Thickness
#4 0.1120 0.1150 0.3125 0.0310
#6 0.1380 0.1563 0.3750 0.0310
#8 0.1640 0.1719 0.3750 0.0310
#10 0.1900 0.2031 0.3750 0.0500
#12 0.2160 0.2500 0.5625 0.0500
1/4 0.2500 0.2810 0.6250 0.0500
5/16 0.3125 0.3430 0.7500 0.0500
3/8 0.3750 0.4060 0.8750 0.0500
7/16 0.4375 0.5000 1.1250 0.0620
1/2 0.5000 0.5310 1.2500 0.0620
9/16 0.5625 0.6250 1.3750 0.0780
5/8 0.6250 0.6870 1.5000 0.0780
3/4 0.7500 0.8120 1.8750 0.1090
7/8 0.8750 0.9370 2.0000 0.1090
1 1.0000 1.0620 2.0000 0.1250
1 1/8 1.1250 1.1870 2.5000 0.1250
1 1/4 1.2500 1.3120 2.7500 0.1250
1 3/8 1.3750 1.5000 3.2500 0.1400
1 1/2 1.5000 1.5620 3.2500 0.1400
1 3/4 1.7500 1.8120 3.5000 0.1400
2 2.0000 2.1250 4.0000 0.1870
  1. All dimensions are in inches.
316 SS Flat Washer
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
#10 0.2031 0.3750 0.05 WFS6 10 In Stock $0.11026/EA EA
1/4 0.2810 0.6250 0.05 WFS6025 In Stock $0.049/EA EA
5/16 0.3430 0.75 0.05 WFS6031 In Stock $0.06392/EA EA
3/8 0.4060 0.8750 0.05 WFS6037 In Stock $0.06807/EA EA
7/16 0.5 1.1250 0.0620 WFS6043 In Stock $0.22122/EA EA
1/2 0.5310 1.25 0.0620 WFS6050 In Stock $0.17779/EA EA
9/16 0.6250 1.3750 0.0780 WFS6056 In Stock $1.41044/EA EA
5/8 0.6870 1.5 0.0780 WFS6062 In Stock $0.30846/EA EA
3/4 0.8120 1.8750 0.1090 WFS6075 In Stock $0.66423/EA EA
7/8 0.9370 2.0 0.1090 WFS6087 In Stock $0.75331/EA EA
1 1.0620 2.0 0.1250 WFS6100 In Stock $0.85421/EA EA
1 1/8 1.1870 2.5 0.1250 WFS6112 In Stock $1.83819/EA EA
1 1/4 1.3120 2.75 0.1250 WFS6125 In Stock $1.8971/EA EA
1 1/2 1.5620 3.25 0.14 WFS6150 In Stock $3.08066/EA EA