Best Carriage Bolts (2026 Guide)
We selected products by aggregated user rating and review volume, prioritizing corrosion-resistant finishes, included hardware, and common sizes for outdoor and structural use
The Verdict
- Best Overall: Zonon Stainless Steel Carriage Bolts Kit (50 pcs) with Nuts & Washers — Great stainless option: full kit with nuts and washers for corrosion-prone outdoor and indoor projects
- Best Value: 1/2 in. x 3-1/2 in. Carriage Bolt Kit, ceramic black ruspert coating — Best for exterior builds needing rust-resistant finishes thanks to ceramic black Ruspert coating and common structural length
This guide helps you compare top-rated carriage bolts selected by cumulative rating and review volume across common sizes, coatings and pack counts. Picks prioritize corrosion resistance, included hardware (nuts and washers), and real-world feedback for outdoor and structural use
Top Picks
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1
Best Overall Zonon Stainless Steel Carriage Bolts Kit (50 pcs) with Nuts & Washers
Great stainless option: full kit with nuts and washers for corrosion-prone outdoor and indoor projects
A versatile kit of stainless steel carriage bolts, hex nuts, and flat washers in 5/16-18 size. Includes 50 bolts, 50 nuts, and 50 washers for a complete fastener set. Customers note solid construction and good fit
- all-in-one fastener kit
- stainless steel for corrosion resistance
- precise 5/16-18 thread
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2
Best Value 1/2 in. x 3-1/2 in. Carriage Bolt Kit, ceramic black ruspert coating
Best for exterior builds needing rust-resistant finishes thanks to ceramic black Ruspert coating and common structural length
Carriage bolt kit includes 12 bolts, 12 washers, and 12 nuts with a 5-layer ceramic black ruspert coating for rust resistance. Suitable for exterior use and heavy-duty projects like decks and gazebos. Customer notes emphasize quality and value for money
- rust-resistant coating
- complete bolt-kit (bolts, washers, nuts)
- semiflush flat head design
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3
1/2 in x 4 in Carriage Bolt Kit (12 bolts, 12 washers, 12 nuts) ceramic black ruspert coated
Ideal for longer outdoor connections where a 4 in length and rust-resistant coating are required with matching hardware
Carriage bolt kit with ceramic black ruspert coating for exterior use. Includes 12 bolts, 12 washers, and 12 hex nuts; designed for rust resistance and durability. Customers note good build quality and value for money
- rust-resistant coating
- complete kit with nuts and washers
- suitable for exterior lumber
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4
3/8 x 2 in galvanized carriage bolt kit (50 pcs) by Makers Bolt
Solid galvanized choice for deck-building that balances corrosion resistance with a larger 50-piece kit size
Galvanized carriage bolts kit includes bolts, washers, and nuts for exterior projects. Semi-flush flat head aids decking and pergola work; corrosion-resistant coating enhances durability. Customers note good quality and value for money, with mixed feedback on washers
- complete hardware kit
- corrosion-resistant coating
- flat head for semi-flush finish
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5
1/2 in x 5 in black carriage bolt kit (12 bolts, 12 washers, 12 nuts)
Good for long exterior fastenings that need a durable black finish and included washers and nuts
Carriage bolt kit with ceramic black ruspert coating for exterior use. Includes 12 bolts, 12 washers, and 12 hex nuts; rust resistance is noted as 2X that of galvanized. Customers cite solid build and good value, with usefulness for pergolas and decks
- ruspert-coated rust resistance
- includes complete hardware set
- semi-flush flat head design
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6
Galvanized carriage bolt kit 1/4" x 1" (100 pk) with washers and nuts
Practical small-diameter galvanized kit offering lots of pieces for repetitive outdoor fastening tasks
Galvanized 1/4" carriage bolt kit includes 100 bolts, 100 USS washers, and 100 hex nuts. Hot dip galvanized for exterior use; provides semi-flush flat head for decks and outdoor projects. Customer note: high quality and good value
- galvanized exterior-grade
- includes bolts, washers, nuts
- flat head delivers semi-flush finish
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7
1/2 in x 6 in Carriage Bolt Kit with 12 bolts, washers & nuts
Suited to heavy-duty exterior projects needing 6 in length and complete fastening hardware in each kit
Ceramic black ruspert coated carriage bolts kit for exterior use. Includes 12 bolts, 12 washers, and 12 nuts; provides rust resistance and semi-flush flat head for decks and pergolas. Customer note: good quality and value for money
- rust-resistant coating
- includes full hardware kit
- semi-flush head for finished look
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8
1/4 in x 1-1/2 in galvanized carriage bolt kit (100 pcs)
Convenient 1/4 in galvanized option in a 100-piece pack for high-volume wood-to-wood or wood-to-metal work
Galvanized carriage bolt kit includes 100 bolts, 100 washers, and 100 hex nuts. Hot-dip galvanized for exterior use and corrosion resistance; suitable for decks and outdoor structures. Customer: great quality and value for money
- 100 pcs bolts, washers, nuts
- hot-dip galvanized for exterior durability
- meets ASME/ASTM standards
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9
Hillman galvanized carriage bolts 1/4 x 6, 100 ct
Budget-friendly galvanized supply in bulk for longer 6 in applications and frequent use
Carriage bolts for fastening wood to wood or wood to metal with a semi-flush flat head. Self-locking square underside reduces need for a driving tool; galvanized finish resists rust. Customer insight notes good quality and value, with mixed views on thread quality
- rust-resistant galvanized finish
- self-locking square underside
- no washer needed
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10
1/4 in x 2-1/2 in galvanized carriage bolt kit (100 pcs) with nuts & washers
Top galvanized pick for consistent exterior performance and a large 100-piece kit that includes washers and nuts
Galvanized carriage bolt kit includes 100 bolts, 100 washers, and 100 hex nuts. Provides corrosion resistance for exterior use; flat head for semi-flush finish. One customer note highlights quality and value for money
- complete hardware kit
- hot-dip galvanized coating
- meets industry standards