Swordfish 30330 - 210pcs Nylon Insert Lock Nut Assortment - #4-40 to 5/8"-11 - Zinc Plated Steel


  • Hex Nut with a nylon-filled collar at its back end. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the screw when it is subjected to vibration.
  • Designed to be used with like-material machine screws and bolts. It is able to be reused more times than a two-way reversible nut
  • Steel nylon insert stop nuts are less expensive than grade C automation lock nuts.
  • AISI 1008-1010 or equivalent steel material used.
  • Hardness: Rockwell C28 maximum and Proof Load: 90,000 PSI minimum

Swordfish 30330 - 210pcs Nylon Insert Lock Nut Assortment - #4-40 to 5/8"-11 - Zinc Plated Steel Contents:

#4-40 (25pc)

#5-40 (25pc)

#6-32 (25pc)

#8-32 (25pc)

#10-24 (25pc)

#10-32 (25pc)

1/4"-20 (15pc)

5/16"-18 (15pc)

3/8"-16 (10pc)

7/16"-14 (10pc)

1/2"-13 (5pc)

5/8"-11 (5pc)

We are Swordfish Tools, Inc. We have been in the business of manufacturing and distributing our various products since 2005. Our products cover many applications in the automotive, motorcycle, engineering, agricultural, and HVAC industries. We pretty much make it all. We take great pride in offering to you every product we make being that we are the maker and we appreciate your support and input into making our products great. All of our products are made of the highest quality materials available and manufactured with the highest standards in quality control. Being a member of the Auto Care Association we always put our best foot forward in customer service and by offering our customer the best of us in all our products.

Payment Policy:
We only accept payment through PayPal and immediate payment is required for purchase of all of our products.

Shipping / Order Processing Policy:
All orders received before our 11:00am PST cut off time will be processed, picked, packed, and shipped during our normal business hours of M-F 9:00am-5:30pm. We ship all our order expedited at no additional cost to you because we know how important it is to have the right tool and hardware to get the job done.

Return / Exchange Policy:

  • All returns accepted in as new and shipped condition with all assortment pieces intact.
  • Please contact us within 14 Days after receiving your item.
  • Refund given as Money back or replacement (your choice).
  • Return shipping will be paid by yourself unless return/exchange is due to our error.
  • No restocking fee will be charged.