Hillman Zinc-Plated 3/8 in. x 4-1/2 in. Carriage Bolts (50-Pack)

Durable zinc-plated steel carriage bolts for fastening wood-to-wood or wood-to-metal projects. The round head with square neck locks into wood for a clean, semi-flush finish and resists spinning during installation. Ideal for decks, fences, and general construction.

---

Key Features:

• Reliable Wood-to-Metal Fastening: Square neck locks into wood to prevent spinning and provide secure connections
• Clean, Semi-Flush Finish: Rounded head eliminates the need for a washer in many applications
• Corrosion-Resistant Zinc Plating: Provides moderate rust resistance and a consistent silver finish
• Standard Threading: 3/8"-16 coarse right-hand threads fit common nuts and hardware
• Bulk Value Pack: 50 bolts per pack for larger builds and repeat projects

---

Specifications Table:

Specification	Details
Material	Steel, zinc-plated (Alloy Steel listed by manufacturer)
Finish	Zinc-plated
Color	Silver/Zinc
Diameter	3/8 inch (0.38 in)
Length	4-1/2 inch
Thread Size	3/8"-16
Thread Type	UNC (coarse)
Thread Style	Right-hand
Head Type	Round
Neck	Square, self-locking
Manufacturer Grade	Grade 2
Item Weight	6.45 lb (pack)
Number of Pieces	50
Usage	Wood-to-wood or wood-to-metal fastening
Style	50-Pack
Part Number	240183
UPC	008236087031
Item Package Quantity	1 pack
Measurement System	Inch

---

Frequently Asked Questions (FAQ):

Q: What materials can these carriage bolts be used with?
A: Designed for wood-to-wood and wood-to-metal fastening applications.

---

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

---

Q: Are these suitable for outdoor use?
A: The zinc plating offers moderate corrosion resistance; for harsh coastal or long-term outdoor exposure, consider galvanized or stainless options.

---

Q: What nuts should I use with these bolts?
A: Use 3/8"-16 coarse-thread nuts and compatible washers if needed.

---

Q: What is the length and diameter?
A: Each bolt is 3/8 inch diameter and 4-1/2 inches long.

---

A Polished, Workhorse Fastener for Timeless Wood Builds

These zinc-plated carriage bolts bring a refined, purposeful gleam to carpentry, anchoring boards with a tidy, rounded head that sits beautifully flush. The square neck detail is the hero—subtle yet decisive, keeping lines clean and hardware discreet. Style them across deck balusters or cabinetry jigs for a unified, tailored look. Essential hardware that quietly elevates craftsmanship and durability in every space.

---

AI Review Summary:

Across verified reviews, customers praise the consistent quality and value of the 50-pack, noting clean threads and reliable fit with 3/8"-16 nuts. Many highlight the square neck’s effective bite into wood, making installation straightforward and preventing bolt spin. The zinc finish is appreciated for its neat appearance and moderate corrosion resistance, though a minority recommend galvanized or stainless options for harsh outdoor conditions. Occasional feedback mentions minor variations in head stamping or finish, but performance remains solid. Representative quotes: “Perfect for deck and fence projects—threads were clean and every bolt usable.” “Square shoulder locks in great; no need to hold the head.” “Zinc is fine for most jobs, but I’d go galvanized near the ocean.”

---

Secure your next build with these dependable Hillman carriage bolts—add the 50-pack to your cart today.