08/31/2026: Due to a warehouse outage, some orders will not ship today. If it is critical that your parts ship today, please call to confirm: 866-688-2500

4-40 NM Nylon Insert Locknuts / Light Hex Standard / 18-8 Stainless Steel / Black Oxide

Product Details

Part Number: 438337 Carton Quantity: 3,000 pcs Carton Weight: 4.72 lbs
4-40 NM Nylon Insert Locknuts / Light Hex Standard / 18-8 Stainless Steel / Black Oxide Please Note: Item in picture may not reflect size and finish of actual part

Technical Specs

Pricing Information

1-2 Carton Price: $285.48 / Carton of 3,000 pcs ($ 0.09516 Each)
3-4 Carton Price: $268.68 / Carton of 3,000 pcs ($ 0.08956 Each)
5+ Carton Price: $253.74 / Carton of 3,000 pcs ($ 0.08458 Each)

Product Specs

  • Part Number: 438337
  • Product Category: Nylon Insert Locknuts
  • Type / Style: Light Hex Standard
  • Size: 4-40
  • Width Across Flats: 1/4"
  • Thickness: 0.133-0.153
  • Material: 18-8 Stainless Steel
  • Finish: Black Oxide
  • RoHS: Compliant
  • width_across_flats: 1/4"

Part # Cross-Reference

  • 04NS188B

More About Part Number 438337

These 4-40 Nylon Insert Locknuts are made from 18-8 Stainless Steel, an austenitic alloy that offers reliable corrosion resistance in mild environments, making it suitable for indoor and outdoor use where moderate exposure is expected. Light Hex Standard Nylon Insert Locknuts, commonly designated as NM locknuts, feature a reduced hex size while maintaining a nylon locking element, making them useful in applications where space is limited but vibration resistance is still required. They feature a Black Oxide Finish, which provides mild corrosion resistance and a dark matte appearance and is commonly used in indoor or lightly protected applications.

⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer.
For more information, go to www.P65Warnings.ca.gov.