Hillman 5/16 in. x 3-1/2 in. Stainless Steel Carriage Bolts (25-Pack)
SKU: 42396517231

Hillman 5/16 in. x 3-1/2 in. Stainless Steel Carriage Bolts (25-Pack)

Sale price$41.39 Regular price$45.99
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Description

Hillman 5/16 in. x 3-1/2 in. Stainless Steel Carriage Bolts (25-Pack)Stainless Steel Carriage Bolts, 5 16 in. x 3 1 2 in. (25 Pack) Durable Hillman stainless steel carriage bolts provide a smooth, domed head and square neck that locks into wood for secure fastening. Ideal for exterior projects, they resist rust and corrosion and deliver a clean, semi flush finish. Key Features: Corrosion Resistant: Stainless steel construction stands up to outdoor and marine environments Secure Hold: Square shoulder locks into wood to

Stainless Steel Carriage Bolts, 5/16 in. x 3-1/2 in. (25-Pack)

Durable Hillman stainless steel carriage bolts provide a smooth, domed head and square neck that locks into wood for secure fastening. Ideal for exterior projects, they resist rust and corrosion and deliver a clean, semi-flush finish.


Key Features:

  • Corrosion Resistant: Stainless steel construction stands up to outdoor and marine environments
  • Secure Hold: Square shoulder locks into wood to prevent spinning during tightening
  • Clean Finish: Smooth, domed head creates a semi-flush, snag-free surface
  • Coarse Thread: SAE coarse threading for strong, reliable assembly
  • Value Pack: Includes 25 bolts sized 5/16 in. diameter x 3-1/2 in. length

Specifications Table:

Specification Details
Diameter 5/16 inch
Length 3-1/2 inch
Material Stainless Steel
Finish Stainless steel
Thread Size 5/16-18 (coarse)
Thread Type Coarse
Unit of Measurement SAE
Head Style Domed carriage head
Neck Style Square shoulder
Number in Package 25
Packaging Type Boxed
Intended Use Fasten wood face to wood or metal frame
Pack UPC (on box) 008236144932

Frequently Asked Questions (FAQ):

Q: Do these bolts include nuts or washers?
A: No—this pack contains only the carriage bolts; nuts and washers are sold separately.


Q: Can I use these outdoors?
A: Yes, the stainless steel material offers excellent rust and corrosion resistance for exterior applications.


Q: What tools are needed for installation?
A: Tighten from the nut side; the square neck locks into the wood to prevent bolt rotation, so no driver is needed for the head.


Q: What thread size are these?
A: They are 5/16 in. diameter with coarse SAE threads (5/16-18).


Q: What materials are they best for?
A: Designed to fasten a wood face to wood or metal framing.


Sleek Strength for Thoughtful Builds

A polished dome of stainless steel lends a refined, unobtrusive accent to woodwork while delivering steadfast performance. The square-shoulder detail is the quiet hero—discreetly locking into timber for a flawless, flush look. Pair with cedar or painted millwork where hardware should disappear into the narrative. For elevated outdoor living, these bolts are the subtle signature of craftsmanship.


Upgrade your project with corrosion-proof, clean-finish carriage bolts—add this 25-pack to your cart today.

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: 42396517231

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Kindle Customer
Natrona Heights, US
★★★★★ 5
Game-Changer for Clean, Accurate Shelf Pin Holes!
This shelf pin jig absolutely delivered on everything I needed — the ease of use was fantastic right out of the box. Once I got the layout aligned, drilling was quick and precise. The accuracy is impressive, with clean, straight holes every time, and the included bits worked like a charm. The design is clever, compact, and durable — the aluminum plate feels premium and makes it easy to keep things straight. I love the versatility too; switching between 5mm and 1/4" bits was fast, and the guide holes are clearly labeled. The size is ideal for cabinets, bookcases, and even tighter spaces where a bulky jig wouldn’t fit. For anyone needing quick, repeatable shelf pin drilling, this jig speeds up the use and keeps your project moving fast without compromising quality. If you're doing any custom shelving or cabinet work, this is a must-have tool that saves time and eliminates guesswork.
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Reviewed in the United States on May 13, 2025
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Danielle Fassler
Draper, US
★★★★★ 4
Works well for DIY
Worked well for building bookshelf. Wish it maybe had som little pads on the back as some times it would slide a bit, but if I tightened it more it would dent the wood slightly. Overall very easy to use and worked well for its intended use.
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Reviewed in the United States on January 18, 2026
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James Clements
Waukegan, US
★★★★★ 5
Solid thick aluminum construction
Size: 9 Holes
Very well made, thick aluminum construction and fully customizable.
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Reviewed in the United States on March 13, 2026
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TIMOTHY RITTER
New York, US
★★★★★ 5
Good addition to my jig collection!!!
Size: 9 Holes
It works great! Would be better if it had a Brad style drill bit instead of the ones that came with it.
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Reviewed in the United States on April 9, 2026
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brian
Alexandria, US
★★★★★ 5
Easy to use
Size: 9 Holes
Very easy to use and setup.
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Reviewed in the United States on March 31, 2026

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