5/16 in. USS Nylon Lock Nuts, Zinc-Plated Steel (100-Pack)

These Hillman nylon insert lock nuts provide reliable, vibration-resistant fastening for general construction and repair. Made of steel with a zinc-plated finish and a nylon insert, they resist corrosion and stay tight without separate lock washers.

Key Features:

• Vibration-Resistant Hold: Nylon insert locks the nut to prevent loosening without lock washers
• Durable Construction: Steel body with zinc-plated finish for corrosion resistance
• Standard Sizing: 5/16-18 coarse (USS) thread fits common bolts and studs
• Bulk Convenience: 100-piece pack for jobsites, workshops, and restocking
• Versatile Use: Ideal for machinery, automotive, and general fastening applications

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What thread size are these lock nuts?
A: They are 5/16-18 coarse thread (USS).

Q: Do I still need a lock washer with these?
A: No. The nylon insert provides the locking action, eliminating the need for a separate lock washer.

Q: What materials are these made from?
A: They have a steel body with a zinc-plated finish and a nylon insert.

Q: How many nuts come in the box?
A: 100 pieces.

Q: Are these suitable for outdoor use?
A: The zinc plating offers basic corrosion resistance; for harsh environments, consider stainless or additional protection.

Quiet Strength in a Polished Finish

These nylon lock nuts bring a tailored precision to any build—small details that make the whole composition feel intentional. I love the subtle sheen of zinc-plated steel against raw timber or matte black hardware. Use them to secure custom shelving brackets or a sculptural light fixture where reliability matters as much as aesthetics. A chic, hardworking essential for elevated, enduring spaces.

Secure your next project with dependable, corrosion‑resistant hold—add this 100‑pack of Hillman nylon lock nuts to your cart now.