Hillman 5/16 in. x 3-1/2 in. Galvanized Hex Bolts (50-Pack)

Durable Grade 2 steel hex bolts with a hot-dipped galvanized finish for superior corrosion resistance in outdoor and general-purpose applications. Coarse-thread, partially threaded shank delivers strong clamping force for wood-to-wood, wood-to-metal, or metal-to-metal fastening.

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Key Features:

• Corrosion Resistant Galvanized Finish: Hot-dipped zinc coating stands up to outdoor and marine environments.
• General-Purpose Strength: Grade 2 steel suitable for most common fastening tasks.
• Coarse Thread Grip: Partially threaded shank reduces shear movement and improves hold between materials.
• Versatile Applications: Ideal for wood, metal, and mixed-material assemblies; pair with matching nuts and washers.
• Bulk Value Pack: 50 bolts per box for convenient stocking on the jobsite or in the shop.

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Specifications Table:

Specification	Details
Brand	Hillman
Finish	Hot Dipped Galvanized
Grade	Grade 2
Diameter	5/16 inch
Length	3-1/2 inch
Material	Steel
Thread Type	Coarse (UNC)
Shank	Partially threaded
Number in Package	50
Packaging Type	Boxed

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Frequently Asked Questions (FAQ):

Q: Are matching nuts and washers included?
A: No. Use nuts and washers of the same grade (Grade 2) and galvanized finish for best results.

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Q: Can these bolts be used outdoors?
A: Yes. The hot-dipped galvanized coating provides strong corrosion resistance for exterior use.

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Q: What thread type do these bolts have?
A: Coarse thread (UNC).

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Q: Do I need to pre-drill holes?
A: Pre-drilling is recommended to ensure proper fit and prevent splitting, especially in wood.

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Q: What are the exact dimensions?
A: Diameter: 5/16 inch; Length: 3-1/2 inch; partially threaded shank.

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Industrial polish with weatherproof poise

These galvanized hex bolts bring a clean, utilitarian rhythm to outdoor structures and custom furniture alike. I love the subtle sheen of hot-dipped zinc—it feels both rugged and refined. Try them as a deliberate design note on cedar planters or a steel-framed bench, letting the hardware punctuate the composition. They’re the quiet, steadfast detail that elevates everyday builds into enduring luxury.

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Outfit your next project with these galvanized hex bolts for reliable, weather-ready fastening that lasts.