Hillman Grade 5 Zinc Hex Head Cap Screws, 5/16 in. x 1-1/4 in., 100-Pack

These Hillman hex head cap screws are Grade 5 steel with a heat-treated zinc finish for strength and wear resistance. Sized 5/16 in. diameter by 1-1/4 in. length, they feature coarse threads and a washer face under the head for secure fastening in wood or metal applications.

Key Features:

• Grade 5 Strength: Heat-treated steel provides higher tensile strength for demanding projects
• Corrosion-Resistant Finish: Zinc plating helps protect against rust and wear
• Washer Face Head: Built-in bearing surface under the hex head improves sealing and load distribution
• Coarse Thread Design: Reliable grip and easier starts in tapped holes or with nuts
• Contractor Pack: 100-piece boxed pack for efficient stocking and jobsite use

Specifications Table:

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: They are partially threaded along the shank, typical of Grade 5 hex cap screws.

Q: What tools are needed for installation?
A: Tighten with a wrench or a drill/driver using the appropriate socket or hex bit.

Q: What is the thread type?
A: Coarse thread (USS).

Q: Can these be used outdoors?
A: The zinc finish offers basic corrosion resistance; for harsh or marine environments, consider stainless or hot-dipped galvanized fasteners.

Q: What size are these screws?
A: 5/16 inch diameter by 1-1/4 inch length.

A Polished Workhorse for Clean, Confident Connections

Crisp zinc sheen meets industrial rigor—these hex cap screws bring a tailored, utilitarian elegance to built-ins and exposed hardware moments. The washer-faced head sits neatly, creating a refined junction that feels intentional, not improvised. Style them with matte-black brackets or raw oak for a modern, mixed-material narrative. An essential, high-strength staple for projects where performance and polish must coexist.

Secure your projects with Grade 5 strength—add this 100-pack of Hillman zinc hex cap screws to your cart today.