5/16" Machine Screw Flat Washers / Low Carbon Steel / Black Oxide
- Steel
- Black Oxide
- ASME B18.22.1
$299.34
$0.299 / pc
Package of 1000
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Product Description
5/16" Machine Screw Flat Washers / Low Carbon Steel / Black Oxide
Frequently Asked Questions
What is the difference between USS and SAE flat washers?
USS (Type B) flat washers have larger outside diameters and are thicker than SAE (Type A) washers of the same bolt size. USS is designed for softer materials and larger load distribution. SAE is used for harder materials and standard fastener installation.
Does Black Oxide finish provide corrosion protection?
Black Oxide provides mild corrosion resistance through a controlled oxidation process. It is dimensionally stable (no plating buildup), will not chip or flake, and is suitable for indoor use. For outdoor or wet environments, additional oil coating or a different finish (zinc, stainless) is recommended.
$299.34
$0.299/pc
Machine Screw Flat Washers / Steel / Black Oxide
Family: WMB
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Technical Specifications
Thread Size
5/16"
Thread Type
Coarse
Material
Steel
Finish
Black Oxide
Thread Direction
Unthreaded
Standard
ASME B18.22.1
Country of Origin
Import
Point Type
Machine (Blunt)
Washer Type
Machine Screw Style
Inside Diameter
.325" - .335"
Outer Diameter
.620" - .630"
Thickness
.046" - .054"
Measurement System
Inch
SKU
31WMB-1000