Hillman 5/16 in. x 3 in. Stainless Steel Carriage Bolt, 25-Pack5 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

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.

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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

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Specifications Table:

Specification	Details
Material	Stainless Steel
Finish	Stainless Steel
Diameter	5/16 in.
Length	3 in.
Head Style	Round (carriage head)
Head Type	Flat/semi-flush under head
Neck	Square, self-locking
Thread Type	UN, Right Hand
Fastener Type	Carriage Bolt
Measurement System	Inch
Pack Quantity	25
Intended Use	Wood-to-wood or wood-to-metal fastening
Manufacturer Grade	Grade 2
Part Number	0832578 / 832578
UPC (web source)	008236144925
Product Dimensions (package)	3.25 x 3.37 x 2 in.

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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.

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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.

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

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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.

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

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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.

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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.”

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