Mutual Screw & Supply

MS21044C04 | Mil-Spec Self-Locking Nuts (250 / Pkg.)

MS21044C04 | Mil-Spec Self-Locking Nuts (250 / Pkg.) - Main image
$112 $175 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 (4.6 / 5 · 5 reviews)

Amelia ★★★★★

Used these on a few engine mounts and they held tight even after hours of vibration. The nylon insert really does its job locking the threads.

Mia ★★★★★

Installed a dozen of these on the tractor deck and they held tight through a full afternoon of rough mowing. The nylon insert really locks the nut in place without galling the threads. Good deal for the quantity.

Scarlett U. ★★★★★

Picked up a pack for securing some brackets on my off-road rig, and the self-locking mechanism is a lifesaver—no more worrying about nuts backing off mid-drive. The mil-spec feel gives me confidence they’ll hold under constant vibration.