Hillman Grade 8 Hex Head Cap Screws, 5/16 in. x 1-1/4 in. (100-Pack)

Heavy-duty Grade 8 hex head cap screws built from heat-treated steel for high-strength fastening. Coarse thread with washer face under the head provides secure clamping and reliable torque in machinery, automotive, and construction applications.

Key Features:

• Grade 8 Strength: Heat-treated steel delivers high tensile strength for demanding applications
• Washer Face Under Head: Improves load distribution and sealing for a solid clamp
• Coarse Thread: Promotes quick starts and strong holding in tapped holes or with nuts
• Precise Sizing: 5/16 in. diameter x 1-1/4 in. length, partially threaded shank
• Bulk Value: Box of 100 screws for shop, jobsite, or inventory needs

Specifications Table:

Frequently Asked Questions (FAQ):

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

Q: What thread type do these use?
A: Coarse thread (USS).

Q: What grade are the screws?
A: Grade 8, heat-treated for high strength.

Q: What materials are they made from?
A: Steel, heat-treated; yellow dichromate finish noted on the packaging line.

Q: What tools do I need to install them?
A: Tighten with a wrench or compatible socket; can also be driven with a drill and socket adapter.

Industrial Strength, Clean Hardware Finish

These hex cap screws bring a quiet, engineered rigor to your projects—sleek, purposeful, and impeccably strong. The faceted head and washer face create a crisp, tailored look against metal or hardwood. Style them with blackened brackets or raw steel accents for a refined utilitarian statement. Consider them the discreet luxury essential that keeps bold design securely in place.

Secure your builds with Grade 8 confidence—add this 100-pack to your cart and finish the job right.