Mutual Screw & Supply

MS21043-3 | Mil-Spec Self-Locking Nuts (25 / Pkg.)

MS21043-3 | Mil-Spec Self-Locking Nuts (25 / Pkg.) - Main image
$10.62 $14.75 In stock

These self-locking nuts are well suited to securing fasteners against vibration loosening.

  • Applications: Securing fasteners against vibration loosening

Specifications

  • Product type: Self-Locking Nuts
  • Measurement type: Imperial
  • Pack quantity: 25 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 (4.2 / 5 · 5 reviews)

Lily A. ★★★★★

The nylon insert grabbed the threads perfectly on the first pass, and after a week of heavy vibration from my air compressor, not one of these has backed off. Exactly what I needed for peace of mind on critical joints.

Julian F. ★★★★★

Finally found a reliable solution for my mower deck—these lock nuts haven't budged after a season of hard use. The self-locking mechanism is a game-changer for keeping bolts tight.

Leo ★★★★☆

Used a pack of these on a shaky lawn mower deck and they held tight through a whole season. The locking feature works well, though I wish there were a few more in the package for the price.