Stainless Steel Carriage Bolts, 5/16 in. x 3-1/2 in. (25-Pack)

Durable Hillman stainless steel carriage bolts provide a smooth, domed head and square neck that locks into wood for secure fastening. Ideal for exterior projects, they resist rust and corrosion and deliver a clean, semi-flush finish.

Key Features:

• Corrosion Resistant: Stainless steel construction stands up to outdoor and marine environments
• Secure Hold: Square shoulder locks into wood to prevent spinning during tightening
• Clean Finish: Smooth, domed head creates a semi-flush, snag-free surface
• Coarse Thread: SAE coarse threading for strong, reliable assembly
• Value Pack: Includes 25 bolts sized 5/16 in. diameter x 3-1/2 in. length

Specifications Table:

Frequently Asked Questions (FAQ):

Q: Do these bolts include nuts or washers?
A: No—this pack contains only the carriage bolts; nuts and washers are sold separately.

Q: Can I use these outdoors?
A: Yes, the stainless steel material offers excellent rust and corrosion resistance for exterior applications.

Q: What tools are needed for installation?
A: Tighten from the nut side; the square neck locks into the wood to prevent bolt rotation, so no driver is needed for the head.

Q: What thread size are these?
A: They are 5/16 in. diameter with coarse SAE threads (5/16-18).

Q: What materials are they best for?
A: Designed to fasten a wood face to wood or metal framing.

Sleek Strength for Thoughtful Builds

A polished dome of stainless steel lends a refined, unobtrusive accent to woodwork while delivering steadfast performance. The square-shoulder detail is the quiet hero—discreetly locking into timber for a flawless, flush look. Pair with cedar or painted millwork where hardware should disappear into the narrative. For elevated outdoor living, these bolts are the subtle signature of craftsmanship.

Upgrade your project with corrosion-proof, clean-finish carriage bolts—add this 25-pack to your cart today.