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

Durable stainless steel carriage bolts for fastening wood-to-wood or wood-to-metal. The round head with square neck locks into place for a clean, semi-flush finish and resists corrosion for outdoor use.

Key Features:

• Corrosion-Resistant Stainless Steel: Ideal for exterior and high-moisture applications
• Secure Square-Neck Design: Prevents spinning for easier installation in wood
• Clean, Semi-Flush Finish: Rounded head eliminates the need for a washer in many uses
• Sized for Versatility: 5/16 in. diameter x 3 in. length; pack of 25 for projects and spares
• Right-Hand Threads: Consistent fastening performance with standard nuts

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What materials can these carriage bolts be used with?
A: They’re designed primarily for wood connections, fastening wood to wood or wood to metal.

Q: Do I need a washer under the head?
A: Often no— the rounded head is designed to provide a semi-flush finish without a washer, though washers may still be used as needed on the nut side.

Q: Are these suitable for outdoor projects?
A: Yes. The stainless steel construction offers superior rust resistance for outdoor and marine-adjacent environments.

Q: What is included in the pack?
A: A total of 25 carriage bolts sized 5/16 in. diameter by 3 in. length. Nuts and washers are not included.

Q: What thread direction and style are these?
A: Right-hand UN threads.

Sleek Hardware, Polished Finish

These stainless carriage bolts bring a refined, utilitarian elegance to decks, benches, and exposed joinery. The smooth domed head creates a clean, hardware-forward punctuation that feels thoughtfully intentional. Try aligning them in rhythmic rows on outdoor seating or gates for an understated, architectural accent. Their corrosion-resistant sheen makes them a smart, stylish essential for elevated, lasting builds.

AI Review Summary:

Overall sentiment is positive for quality and value, with many buyers praising the corrosion resistance and performance in outdoor woodworking (e.g., decks, treated lumber). Several note smooth installation and the square neck holding firmly in wood. A minority report thread issues where some standard nuts didn’t start easily or felt rough, and a few mention occasional bolt defects or breakage under high torque. Representative quotes: “Great quality stainless for outdoor projects,” “Square neck bites perfectly—no spinning,” and on the downside, “Threads on a few bolts were inconsistent and hard to nut.”

Upgrade your project with corrosion‑resistant fastening—add these stainless carriage bolts to your cart today.