Flat Washers Black Oxide 18-8 Stainless Steel

Black Oxide Stainless Steel Flat Washers

Chemically Treated Black Oxide Stainless Steel Round Flat Washers


  • Black Oxide flat washers are used mostly on black tools
  • Commonly picked for their sleek black look
  • Used on gun and knife builds, and by car and motorcycle enthusiasts alike
  • Black Oxide Flat Washers are 18-8 stainless steel that are chemically treated to create their black oxide finish

Call our toll-free number for more options and information on Black Oxide Stainless Steel fasteners and custom orders: 866-573-0445


Flat Washer Sizes Inner Diameter (ID) Outer Diameter (OD) Washer Thickness
#2 0.099" 0.250" 0.031"
#4 0.125" 0.312" 0.031"
#6 0.150" 0.312" 0.031"
#8 0.174" 0.375" 0.031"
#10 0.203" 0.437" 0.031"
1/4" 0.281" 5/8" 0.050"
5/16" 0.343" 3/4" 0.050"
3/8" 0.406" 7/8" 0.050"
1/2" 0.531" 1-1/4" 0.062"
5/8" 0.687" 1-1/2" 0.078"
3/4" 0.812" 1-7/8" 0.109"

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