Hillman 5/16 in. x 1-1/4 in. Zinc-Plated Steel Carriage Bolt, 100-Pack5 16" x 1 1 4" Zinc Plated Carriage Bolts (100 Pack) Durable Hillman carriage bolts made of zinc plated steel for reliable fastening in wood to wood or wood to metal applications. The square neck locks into wood to prevent spinning, while the rounded head offers a clean, semi flush finish. Key Features: Reliable Wood Fastening: Square neck locks into wood to prevent bolt spin during tightening Clean Finish: Rounded head provides a semi flush, washer

5/16" x 1-1/4" Zinc-Plated Carriage Bolts (100-Pack)

Durable Hillman carriage bolts made of zinc-plated steel for reliable fastening in wood-to-wood or wood-to-metal applications. The square neck locks into wood to prevent spinning, while the rounded head offers a clean, semi-flush finish.

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Key Features:

• Reliable Wood Fastening: Square neck locks into wood to prevent bolt spin during tightening
• Clean Finish: Rounded head provides a semi-flush, washer-less appearance
• Corrosion Protection: Zinc-plated steel offers moderate rust resistance for indoor/outdoor projects
• Standard Thread: 5/16"-18 fully threaded shank for common hardware compatibility
• Bulk Value: Convenient 100-pack for jobsites and repeat projects

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Specifications Table:

Specification	Details
Size	5/16 x 1-1/4-Inch
Thread Size	5/16"-18
Thread Type	UN
Thread Class	2A
Thread Style	Fully Threaded
Fastener Type	Carriage Bolt
Material	Steel (Alloy Steel listed by manufacturer)
Exterior Finish	Zinc-Plated
Finish	Glossy
Head Style	Rounded/Dome with square neck; flat head appearance noted by manufacturer
Head Type	Flat (manufacturer listing); rounded dome head common to carriage bolts
Item Diameter	0.31 inches (5/16")
Item Hardness / Grade	Grade 2
Number of Pieces	100
Color	Silver / No Color
Shape	Cylindrical
Usage	Wood
Measurement System	Inch
Included Components	Carriage bolts only
Item Weight	3.4 lb
Part Number	240081
Item Model Number	240081
UPC	008236086676
Global Trade Identification Number	00008236086676
Manufacturer	The Hillman Group

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Frequently Asked Questions (FAQ):

Q: Are nuts included with these carriage bolts?
A: No; this listing is for bolts only. Pair with compatible 5/16"-18 nuts and washers as needed.

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Q: Can these be used outdoors?
A: The zinc plating provides moderate corrosion resistance; for harsh coastal or long-term exterior exposure, consider hot-dip galvanized or stainless options.

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Q: What materials can I fasten with these?
A: Designed primarily for wood; commonly used for wood-to-wood or wood-to-metal connections when the square neck can seat into the wood.

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Q: Do I need a special tool to hold the head?
A: No; the square underside locks into the wood to prevent turning, allowing tightening from the nut side.

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Q: What is the thread specification?
A: 5/16"-18 UNC, fully threaded, Class 2A.

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A Sleek, Functional Fastener for Clean Wood Joinery

These zinc-plated carriage bolts bring a polished, minimal look to wood assemblies, letting the rounded heads sit with a subtle, refined presence. The square neck detail is the hero—anchoring into the timber to keep lines crisp and hardware unobtrusive. Use them on bench frames or garden structures where you want strength without visual clutter. A smart staple for elevated, durable craftsmanship.

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AI Review Summary:

Across verified reviews, customers praise consistent sizing, clean zinc finish, and strong performance in wood projects. Many note the square neck seats well and prevents spinning, making installation straightforward. Satisfaction with bulk value is common. Minor caveats include that zinc plating is best for indoor or mild outdoor use, and nuts/washers are not included. Representative quotes: “Perfect fit—threads were clean and consistent.” “Great value for large woodworking projects.” “Worked flawlessly; the square neck bit into the lumber and stayed put.”

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Secure your projects with these dependable, zinc-plated carriage bolts—add the 100-pack to your cart and build with confidence.