SKU: 9402542888

Hillman 1/2 in. x 3-1/2 in. Zinc-Plated Steel Carriage Bolt, 25-Pack

Sale price$33.29 Regular price$36.99
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Description

Hillman 1/2 in. x 3-1/2 in. Zinc-Plated Steel Carriage Bolt, 25-PackHillman 1 2" x 3 1 2" Zinc Plated Carriage Bolts (25 Pack) Heavy duty Grade 2 steel carriage bolts with a corrosion resistant zinc plated finish for secure wood to wood or wood to metal fastening. The rounded, low profile head with square neck locks into wood to prevent spinning and allows a semi flush finish. Ideal for decks, fences, and general construction projects. Key Features: Secure Wood Fastening: Square neck locks into wood to prevent bolt

Hillman 1/2" x 3-1/2" Zinc-Plated Carriage Bolts (25-Pack)

Heavy-duty Grade 2 steel carriage bolts with a corrosion-resistant zinc-plated finish for secure wood-to-wood or wood-to-metal fastening. The rounded, low-profile head with square neck locks into wood to prevent spinning and allows a semi-flush finish. Ideal for decks, fences, and general construction projects.


Key Features:

  • Secure Wood Fastening: Square neck locks into wood to prevent bolt spin during tightening
  • Rust-Resistant Finish: Zinc plating provides durable, consistent corrosion protection
  • Low-Profile Head: Rounded carriage head delivers a clean, semi-flush look without a washer
  • Heavy-Duty Steel: Grade 2 steel construction for reliable strength in structural applications
  • Bulk Value Pack: 25 bolts per box for project efficiency

Specifications Table:

Specification Details
Brand Hillman
Finish Zinc Plated
Grade 2
Length 3-1/2 inch
Material Steel
Number in Package 25
Packaging Type Boxed
Thread Type Coarse
Unit of Measurement SAE
Diameter 1/2 inch

Frequently Asked Questions (FAQ):

Q: What materials can these carriage bolts fasten?
A: They are designed for fastening a wooden face to either a wood or metal frame, commonly used in decks, fences, and framing.


Q: Do I need a washer under the head?
A: Typically no—the flat, rounded carriage head is designed to provide a semi-flush finish without a washer.


Q: Are these suitable for outdoor use?
A: The zinc plating offers rust resistance for many applications, but may not be ideal for harsh exterior environments; consider hot-dip galvanized for extreme exposure.


Q: What thread type do these bolts use?
A: They feature coarse SAE threads.


Q: What size and length are included in this pack?
A: Each bolt is 1/2 inch diameter by 3-1/2 inches in length; 25 bolts per retail package.


A Clean, Polished Fastener for Timeless Woodwork

The rounded carriage head brings a refined, minimalist touch to exposed joinery, elevating everyday builds with a sleek, polished sheen. I love the square-neck detail—it locks into place, keeping lines crisp and surfaces uninterrupted. Use these on a painted garden gate or a natural wood bench to let the hardware quietly shine. Essential for luxe, lasting craftsmanship that feels both sturdy and sophisticated.


Choose this 25-pack of zinc-plated Hillman carriage bolts for clean, secure wood-to-metal connections that last.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 9402542888

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St. Paul Girl
New York, US
★★★★★ 5
what a difference !
Note: there are no English instructions. I wanted this cleaning agent to disperse throughout the nooks and crannies of the engine, so about ten minutes before arriving at the mechanic's shop for my oil change appointment, I pulled the car over and poured this into the engine, then drove it the rest of the way there. The mechanic reported lots of sludge drained out with the oil. The engine seems to perform and sound better, as if it's not working as hard.
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Reviewed in the United States on February 15, 2026
A
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Andres Moreno
Belleville, US
★★★★★ 4
Buen producto
Buen producto, limpia perfectamente el motor interno y se libera la suciedad en el cambio de aceite. no use todo el contenido, creo que es bueno usarlo en 2 cambios de aceite para una mayor eficiencia.
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Reviewed in the United States on March 29, 2026
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Lee Nunn
Dallas, US
★★★★★ 5
Great will use it over and over again
I will use this in every car I own from now. Cleaned it real well did exactly what it said so and my truck runs a lot better definitely can tell the difference.. it was work the extra oil and work. The bottle I bought came with instructions in English, which made it easy for me. The quality of it is light brake cleaner, but meant for engines and it ran great very easy to use this pour in.
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Reviewed in the United States on October 19, 2025
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Beni
Draper, US
★★★★★ 5
Does its job.
Always a go to before oil changes. Helps remove some extra sludge/deposits. DO NOT DRIVE OR REV THE VEHICLE WHEN USNG THE PRODUCT, only idle for 10-15 min. Ive seen reviews where people drove with it potentially ruining the engine.
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Reviewed in the United States on March 26, 2026
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Adan Ichich
Houston, US
★★★★★ 5
Calidad de limpieza al motor
Excelente producto, lo llevo usándolo un buen tiempo, en cada cambio de aceite, limpia bien por dentro del motor. Es fácil usarlo, hecharlo donde se llena el aceite del motor, y enciende el motor espere 10 minutos, y apague el motor, y vuelve a esperar 25 o 30 minutos para que se enfríe el motor, ya cumplido lo 25 o 30 minutos sacar el aceite viejo del motor. Listo, producto muy recomendable. Excelente funcionamiento, chevy silverado 2004
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Reviewed in the United States on March 15, 2026

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