All pictures represent actual product. 3/8-16 Nylock hex nut, Grade 8 hardened nut. Nylock hex nuts have a nylon insert in the nut that allows the nut to grab the fastener. This keeps the nut from backing off due to vibratio...

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All pictures represent actual product. 3/8-16 Nylock hex nut, Grade 8 hardened nut. Nylock hex nuts have a nylon insert in the nut that allows the nut to grab the fastener. This keeps the nut from backing off due to vibration. Pack of 50. USS Coarse thread. Very good strength. Great for heavy machinery and automotive applications. Where high strength is a must!

  • GRADE 8 ALLOY STEEL CONSTRUCTION – Manufactured from quenched and tempered alloy steel to deliver high strength for demanding fastening applications where standard nuts are not sufficient.
  • ENGINEERED HIGH-STRENGTH PERFORMANCE – Rated with a minimum tensile strength of 150,000 PSI, supporting secure clamping in heavy machinery, automotive, and industrial assemblies.
  • NYLON INSERT LOCKING DESIGN – Integrated nylon insert grips the mating fastener threads to help prevent loosening caused by vibration and movement during operation.
  • 3/8-16 USS COARSE THREAD – Standard 3/8-16 USS coarse thread provides compatibility with common bolts and machine screws used in mechanical and equipment applications.
  • YELLOW CHROMATE ZINC COATING WITH BULK PACK – Yellow chromate zinc finish supports corrosion resistance and easy Grade 8 identification; bulk pack supports shop inventory, maintenance work, and repair operations.

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