5/16 in. Zinc-Plated USS Whiz Lock Nut (100-Pack)

Secure assemblies with these Hillman USS Whiz lock nuts. Made from zinc-plated steel for corrosion resistance, they feature integrated serrations that bite into the mating surface to resist loosening from vibration. Ideal for general construction, automotive, and machinery applications using 5/16-18 threads.

Key Features:

• Vibration Resistance: Built-in serrations provide strong locking action without separate washers
• Durable Build: Zinc-plated steel resists rust and wear for indoor/outdoor use
• USS Threading: 5/16-18 coarse threads for common fastening applications
• Flange Design: Distributes load and helps protect mating surfaces
• Bulk Value: 100-pack for jobsites, shops, and replenishing inventory

Specifications Table:

Frequently Asked Questions (FAQ):

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

Q: Do I need a separate lock washer?
A: No. The serrated flange provides the locking action, eliminating the need for a lock washer in most applications.

Q: Are these suitable for outdoor use?
A: Yes. The zinc plating offers corrosion resistance; for harsh or marine environments, consider stainless or higher-grade coatings.

Q: Can these be used with slotted or oversized holes?
A: The flange helps distribute load, but for oversized holes ensure proper washer or hardware as needed.

Q: What tools are required?
A: Install with a standard wrench or socket sized for the hex across flats.

Industrial Grip with a Clean, Polished Finish

This serrated flange nut adds a sleek, utilitarian note to hardware details, catching the light with its zinc sheen. I love how the integrated flange creates a crisp, purposeful silhouette while delivering serious hold. Style it on exposed hardware moments—think garage shelving or workshop fixtures—for a refined, engineered look. It’s a small luxury in the language of precision.

Lock in reliable hold—add this 100-pack of 5/16-18 zinc-plated Whiz lock nuts to your toolkit today.