Mutual Screw & Supply

#4 Internal Tooth Lock Washers | 18-8 Stainless Steel (400 / Pkg.)

#4 Internal Tooth Lock Washers | 18-8 Stainless Steel (400 / Pkg.) - Main image
$6.6 $10 In stock

These #4 lock washers are manufactured from 18-8 Stainless Steel. They are well suited to preventing fastener loosening under vibration.

  • Material and finish: 18-8 Stainless Steel
  • Thread size: #4
  • Applications: Preventing fastener loosening under vibration

Specifications

  • Product type: Lock Washers
  • Material: 18-8 Stainless Steel
  • Finish: Plain
  • Grade: 18/8
  • Thread size: #4
  • Measurement type: Imperial
  • Pack quantity: 100 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 (4.8 / 5 · 5 reviews)

Joseph Y. ★★★★★

The box of 400 lasted through all the small fasteners on my project, and the stainless finish hasn’t shown a single spot of rust after a humid week. They bite into the surface just right, holding tight even when I ran the drill in reverse to test them.

Sofia H. ★★★★★

Used these #4 lock washers on a vibration-prone machine mount and they held tight even after hours of run time. The 18-8 stainless feels durable and corrosion-resistant, which is exactly what I needed.

George ★★★★★

Had to redo a small electronics project after the original hardware rusted, and these stainless steel washers are perfect—the internal teeth really grip well under vibration. Four hundred washers in one pack means I won't run out anytime soon.