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316 SS Flat Washer

Selected 316 Stainless Steel SAE Flat WasherWashers
316 Stainless Steel SAE Flat WasherWashers

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.

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Dimensional Specifications

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.

Governing Standards

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).