Mutual Screw & Supply

5/16" x 1/2" OD Flat Washers | .050" Thick | Steel Black Oxide (5000 / Pkg.)

5/16" x 1/2" OD Flat Washers | .050" Thick | Steel Black Oxide (5000 / Pkg.) - Main image
$107.28 $149 In stock

These flat washers are manufactured from Steel with a black oxide finish. They are well suited to distributing load and protecting surfaces under fasteners.

  • Material and finish: Steel, Black Oxide finish
  • Applications: Distributing load and protecting surfaces under fasteners

Specifications

  • Product type: Flat Washers
  • Material: Steel
  • Finish: Black Oxide
  • Measurement type: Imperial
  • Dimensions: .343" ID x .500" OD x .050" Thick
  • Pack quantity: 5000 per package

Please note: This item is excess stock and is sold non-cancelable, non-refundable, and non-returnable. Please call us with any questions about this item before ordering.

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When it ships

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Mia ★★★★★

These washers are exactly the right size for my 5/16" bolts and the black oxide coating makes them look uniformly dark. For a bulk pack this large, every single one I've used so far has been cleanly punched with no burrs.

Emily R. ★★★★★

The black oxide finish on these washers is holding up perfectly in my outdoor project, no rust after a week of rain. The consistent thickness makes them stack evenly under bolts, which is great for load distribution. I'm glad I got the bulk pack of 5,000 for the price.

Ryan D. ★★★★★

The 0.050-inch thickness on these washers is exactly what I needed for my bike rack bolts, and the black oxide finish gives them a nice, consistent look. They distribute pressure evenly without warping, even under heavy torque. Pack of 5,000 means I won’t be running out anytime soon for future proje