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  • Inch
    Availability
    Brand
    Cat
    • Washer Type
      Lock Washers External Tooth
    • Fits Bolt Sizes (in)
      No. 10
    • Outside Diameter (OD) - 2 (in)
      0.40
    • Inside Diameter (ID) - 1 (in)
      0.20
    • Finish
      Zinc Plated
    • Thickness - 3 (in)
      0.02
    • Washer Type
      Lock Washers External Tooth
    • Fits Bolt Sizes (in)
      No. 10
    Compare
  • Metric
    Availability
    Brand
    Cat
    • Fits Bolt Sizes (mm)
      M20
    • Washer Type
      Flat Washer
    • Outside Diameter (OD) - 2 (mm)
      40
    • Finish Notes
      Caterpillar is changing from Zinc Plating to a Zinc Flake finish for many washers. The new coating improves corrosion protection to 720 hours. Until stock of the current finish is depleted, you may receive either finish due to the exhaust process.
    • Finish
      Zinc Flake
    • Thickness - 3 (mm)
      10
    • Fits Bolt Sizes (mm)
      M20
    • Washer Type
      Flat Washer
    Compare
  • Inch/Metric
    Availability
    Brand
    Cat
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    • Finish
      Zinc Flake
    • Thickness - 3 (mm)
      5
    • Finish Notes
      Caterpillar is changing from Zinc Plating to a Zinc Flake finish for many washers. The new coating improves corrosion protection to 720 hours. Until stock of the current finish is depleted, you may receive either finish due to the exhaust process.
    • Inside Diameter (ID) - 1 (mm)
      13.5
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    Compare
  • Availability
    Brand
    Cat
    • Fits Bolt Sizes (mm)
      M12
    • Washer Type
      Nord Lock Washers
    • Fits Bolt Sizes (in)
      1/2
    • Outside Diameter (OD) - 2 (mm)
      20
    • Finish
      Zinc Flake
    • Inside Diameter (ID) - 1 (mm)
      14
    • Fits Bolt Sizes (mm)
      M12
    • Washer Type
      Nord Lock Washers
    Compare
  • Inch/Metric
    Availability
    Brand
    Cat
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    • Thickness - 3 (mm)
      6
    • Hardened
      Yes
    • Inside Diameter (ID) - 1 (mm)
      13.5
    • Outside Diameter (OD) - 2 (mm)
      32
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    Compare
  • Metric
    Availability
    Brand
    Cat
    • Fits Bolt Sizes (mm)
      M24
    • Washer Type
      Flat Washer
    • Thickness - 3 (mm)
      8
    • Outside Diameter (OD) - 2 (mm)
      40
    • Inside Diameter (ID) - 1 (mm)
      26
    • Finish
      Zinc Flake
    • Fits Bolt Sizes (mm)
      M24
    • Washer Type
      Flat Washer
    Compare
  • Availability
    Brand
    Cat
    • Fits Bolt Sizes (mm)
      M24
    • Washer Type
      Nord Lock Washers
    • Fits Bolt Sizes (in)
      15/16
    • Finish
      Zinc Flake
    • Thickness - 3 (mm)
      3.4
    • Outside Diameter (OD) - 2 (mm)
      39
    • Fits Bolt Sizes (mm)
      M24
    • Washer Type
      Nord Lock Washers
    Compare
  • Inch/Metric
    Availability
    Brand
    Cat
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    • Finish Notes
      Caterpillar is changing from Zinc Plating to a Zinc Flake finish for many washers. The new coating improves corrosion protection to 720 hours. Until stock of the current finish is depleted, you may receive either finish due to the exhaust process.
    • Hardened
      Yes
    • Thickness - 3 (mm)
      5
    • Finish
      Zinc Flake
    • Washer Type
      Flat Washer
    • Fits Bolt Sizes (in)
      1/2
    Compare
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Hardware Washers and Washer Sets

Cat® Washers and accordant hardened Bolts and Nuts form a matched system that always delivers reliable fasteners.

Types of Washers:

  • Inch / Metric
  • Lock Washers Non-Hardened
  • Screws Zinc Plating
  • Pan Head / Machine
  • Round Head / Machine
  • Coarse Thread (Flat Head Machine Screws, Cup Point, Square Head, Taper Lock Studs)