Hillman Grade 8 Hex Head Cap Screws, 7/16 in. x 3-1/2 in., 25-Pack

Heavy-duty Hillman hex head cap screws engineered from heat-treated steel for high-strength fastening. The 7/16 in. diameter by 3-1/2 in. length bolts feature a washer face under the head and coarse threads, ideal for securing machinery, automotive, and structural assemblies.

Key Features:

• Grade 8 Strength: Heat-treated steel provides superior tensile strength for demanding applications
• Washer Face Head: Integrated bearing surface improves load distribution and sealing
• Coarse Thread Design: Reliable grip and easier starts in tapped holes or with a nut
• Partially Threaded Shank: Adds shear strength where clamping force is needed
• Convenient Value Pack: 25 screws per box for project efficiency

Specifications Table:

Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are partially threaded along the shank for added shear strength.

Q: What thread type do these bolts use?
A: They use coarse threads (USS).

Q: Can I use these outdoors?
A: They are heat-treated steel with a yellow dichromate finish for wear resistance; for long-term outdoor corrosion resistance, consider additional protection or stainless/galvanized alternatives depending on exposure.

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

Q: What size are these bolts?
A: Each bolt is 7/16 in. diameter and 3-1/2 in. length.

Industrial Poise, Engineered to Endure

These hex cap screws bring a disciplined, architectural clarity to utility—sleek, purposeful, and unapologetically strong. The washer-faced head feels refined, giving a tailored finish to exposed joinery. Use them to punctuate a workshop bench or custom metal frame where the hardware becomes part of the story. Their confident presence and grade-8 grit make reliability feel luxurious.

Choose Hillman Grade 8 hex cap screws for dependable, high-strength fastening that finishes your project right the first time.