Hillman Grade 8 Hex Head Cap Screws, 5/16 in. x 3-1/2 in., 50-Pack

Heavy-duty Grade 8 hex head cap screws engineered from heat-treated steel for high-strength fastening. Ideal for machinery, automotive, and structural applications where a durable, partially threaded bolt is required.

Key Features:

• Grade 8 Strength: Heat-treated steel provides superior tensile strength for demanding applications
• Washer Face Head: Built-in washer face under head helps improve load distribution and sealing
• Partially Threaded Shank: Offers better shear strength and alignment in assemblies
• Coarse Thread: USS coarse thread for quick starts and strong hold in tapped holes or with nuts
• Bulk 50-Pack: Convenient boxed quantity for shop, jobsite, or maintenance stock

Specifications Table:

Frequently Asked Questions (FAQ):

Q: Are these fully or partially threaded?
A: They are partially threaded along the shank for added shear strength.

Q: What finish do these have?
A: They feature a heat-treated yellow dichromate-style finish for extra wear resistance.

Q: What thread type are they?
A: USS coarse thread.

Q: What tools are needed for installation?
A: Tighten with a wrench or compatible socket; a drill/driver with socket adapter may also be used.

Q: What size are these bolts?
A: 5/16-inch diameter by 3-1/2-inch length.

Industrial Strength With a Sleek, Purposeful Edge

These hex cap screws bring a crisp, engineered precision to any utilitarian vignette—think open-shelf workshops and garage studios. The faceted head and clean shank create a subtle rhythm that feels both rugged and refined. Style them with exposed hardware on custom shelving or welded frames to celebrate honest materials. Their performance pedigree makes them a quiet luxury in hardworking spaces.

Upgrade your hardware bin with Grade 8 strength—add this 50-pack to your cart for reliable, long-lasting fastening.