Mutual Screw & Supply

LKS-440-2 | #4-40 PEM Self-Locking Nuts | Steel (50 / Pkg.)

LKS-440-2 | #4-40 PEM Self-Locking Nuts | Steel (50 / Pkg.) - Main image
$9.49 $15.3 In stock

These #4-40 self-locking nuts are manufactured from Steel. They are well suited to threaded fastening with bolts and studs.

  • Material and finish: Steel
  • Thread size: #4-40
  • Applications: Threaded fastening with bolts and studs

Specifications

  • Product type: Self-Locking Nuts
  • Material: Steel
  • Finish: Plain
  • Thread size: #4-40
  • Threads per inch: 40
  • Measurement type: Imperial
  • Pack quantity: 50 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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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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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)

Michael P. ★★★★★

Used a few of these on a tight bracket assembly and they locked up perfectly on the #4-40 studs. The steel feels robust and the self-locking feature held fast even after some vibration during testing.

Harper I. ★★★★★

Steel's definitely the right choice here—the threads held up perfectly when I cinched them down on a #4-40 stud, and the locking action kept things snug without needing a ton of torque. The 50-count pack is a solid deal for the price, too.

Matthew ★★★★★

The little nylon insert grabs the threads right away, so I don't have to worry about these backing out on a vibrating assembly. The steel body feels solid, and the 50-pack is plenty for the small batch of #4-40 fasteners I needed to secure.