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

These Grade 5 hex head cap screws from Hillman deliver reliable fastening strength for automotive, machinery, and general construction projects. Made of steel with a heat-treated zinc finish, they resist wear while the washer-faced head provides a better seal.

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Key Features:

• Grade 5 Strength: Heat-treated steel provides higher tensile strength for demanding applications
• Corrosion-Resistant Finish: Zinc plating helps protect against rust and wear
• Washer-Faced Hex Head: Flat bearing surface under head improves sealing and load distribution
• Partially Threaded Shank: Adds shear strength while allowing precise clamping
• Coarse Thread Compatibility: Ideal for quick assembly and strong hold with standard nuts

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Specifications Table:

Specification	Details
Brand	Hillman
Diameter	5/16 inch
Length	3-1/2 inch
Material	Steel
Finish	Heat-treated zinc
Grade	Grade 5
Head Type	Hex head with washer face
Thread Type	Coarse
Threading	Partially threaded along shank
Units	Imperial
Pieces per Pack	50
Packaging Type	Boxed

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Frequently Asked Questions (FAQ):

Q: Are these fully threaded?
A: No. They are Grade 5 hex cap screws with a partially threaded shank.

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

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Q: What material and finish?
A: Steel with a heat-treated zinc finish for added strength and wear resistance.

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Q: What thread type do they use?
A: Coarse thread.

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Q: How many are in the box?
A: 50 pieces per pack.

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Industrial polish with purposeful strength

I love how these zinc-kissed hex cap screws bring a refined industrial note to projects—sleek, resilient, and unapologetically functional. The washer-faced head is a subtle design detail that reads clean while working hard behind the scenes. Style them with raw woods and matte black hardware for a balanced, tailored contrast. They’re the quiet essential that elevates craftsmanship to a luxe finish.

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Choose these Hillman Grade 5 hex cap screws for dependable strength and a clean, corrosion-resistant finish on your next build.