Mutual Screw & Supply

MS21044C3 | Mil-Spec Self-Locking Nuts (250 / Pkg.)

MS21044C3 | Mil-Spec Self-Locking Nuts (250 / Pkg.) - Main image
$231 $330 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: 250 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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If you need a refund

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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 (4.4 / 5 · 5 reviews)

Jacob ★★★★★

The lock ring inside grips the bolt threads the moment it touches, and I didn’t have to retighten a single one after a week of heavy rattling around. Opened the pack and counted 250 exactly, which is more than fair for the price.

Brian E. ★★★★★

Used these on a trailer hitch rebuild where vibration is a constant issue, and they held tight through a 500-mile test run. The nylon insert locks securely but still lets you thread them by hand for the first few turns. Exactly what I needed for peace of mind on rough roads.

Henry A. ★★★★★

Used a full pack on the suspension brackets of my trailer hitch and they held tight through a 300-mile shake test. The self-locking action is exactly what the description promises, no vibration loosening at all. These are now my go-to for anything that rattles.