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Carriage Bolts

Need a smooth, snag-free bolt that will not spin while you tighten from the back side? Carriage bolts do the job with a round head and square or rib neck to bite into wood, channel and sheet. Choose Grade 2 for general repairs, Grade 5 for higher clamp load, 18-8 stainless, aluminum or galvanized for corrosion resistance, metric 8.8 when the print calls for it.

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326 results
Grade 5 Zinc Plated Carriage Bolts
Grade 5 Zinc Plated Carriage Bolts
Grade 5 carriage bolts made from heat‑treated 1035 steel with round heads, square shoulders and coarse threads; zinc plated finish and marked with three radial lines for grade identification. Fully threaded to the shoulder in most lengths, provides high tensile strength for structural fastening.
Diameter: 1/4"

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3/4"
1/4"-20
100
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1"
1/4"-20
100
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1-1/4"
1/4"-20
100
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1-1/2"
1/4"-20
100
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1-3/4"
1/4"-20
100
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2"
1/4"-20
50
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2-1/2"
1/4"-20
50
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Diameter: 5/16"

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3/4"
5/16"-18
100
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1"
5/16"-18
100
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1-1/4"
5/16"-18
100
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1-1/2"
5/16"-18
100
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1-3/4"
5/16"-18
100
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Grade 5 Zinc Plated Rib Neck Carriage Bolts
Grade 5 Zinc Plated Rib Neck Carriage Bolts
Grade 5 rib neck carriage bolts made from 1035 steel with zinc plating. Dome head and flat under-head bearing surface provide even clamp load; ribbed neck locks into holes to prevent turning. Fully threaded coarse threads, high tensile strength for general fastening.
Diameter: 1/4"

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1"
1/4"-20
50
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1-1/4"
1/4"-20
50
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1-1/2"
1/4"-20
50
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2"
1/4"-20
50
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Diameter: 5/16"

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1"
5/16"-18
50
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1-1/2"
5/16"-18
25
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2"
5/16"-18
25
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Diameter: 3/8"

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1"
3/8"-16
25
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1-1/4"
3/8"-16
25
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1-1/2"
3/8"-16
25
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2"
3/8"-16
25
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2-1/2"
3/8"-16
25
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Grade 2 Zinc Plated Carriage Bolts
Grade 2 Zinc Plated Carriage Bolts
Grade 2 carriage bolts made from stress‑relieved 1020 steel with round heads, square shoulders and clean, coarse threads. Zinc‑plated finish resists corrosion and ASTM A307 60,000 psi tensile construction provides reliable strength, suitable for general fastening and wood or metal joinery.
Diameter: 3/16"

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1"
3/16"-24
100
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1-1/4"
3/16"-24
100
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1-1/2"
3/16"-24
100
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2"
3/16"-24
50
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2-1/2"
3/16"-24
50
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Diameter: 1/4"

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1/2"
1/4"-20
100
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3/4"
1/4"-20
100
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1"
1/4"-20
100
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1-1/4"
1/4"-20
100
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1-1/2"
1/4"-20
100
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1-3/4"
1/4"-20
100
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2"
1/4"-20
50
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Grade 2 Galvanized Carriage Bolts
Grade 2 Galvanized Carriage Bolts
Grade 2 galvanized carriage bolts manufactured from carbon steel with round heads, square shoulders and coarse USS threads. Hot-dip galvanized finish resists corrosion and ASTM A307 Grade 2 construction provides 60,000 psi tensile strength. Suitable for general structural and outdoor fastening.
Diameter: 1/4"

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1-1/2"
1/4"-20
100
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2"
1/4"-20
50
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2-1/2"
1/4"-20
50
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3"
1/4"-20
50
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3-1/2"
1/4"-20
50
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4"
1/4"-20
50
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5"
1/4"-20
50
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Diameter: 5/16"

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1"
5/16"-18
100
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1-1/2"
5/16"-18
100
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2"
5/16"-18
50
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2-1/2"
5/16"-18
50
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3"
5/16"-18
50
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18-8 Stainless Steel Carriage Bolts
18-8 Stainless Steel Carriage Bolts
18-8 stainless steel round-head carriage bolts with square shoulders and coarse threads, fully threaded to the shoulder. Corrosion-resistant stainless construction provides durability and the square shoulder helps prevent rotation for secure wood and metal fastening applications.
Diameter: 1/4"

Length Thread Size Package Qty Item #
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3/4"
1/4"-20
25
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1"
1/4"-20
25
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1-1/4"
1/4"-20
25
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1-1/2"
1/4"-20
25
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1-3/4"
1/4"-20
25
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2"
1/4"-20
25
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2-1/2"
1/4"-20
25
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3"
1/4"-20
25
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3-1/2"
1/4"-20
10
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4"
1/4"-20
10
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Diameter: 5/16"

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3/4"
5/16"-18
25
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1"
5/16"-18
25
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Metric 8.8 Zinc Plated Carriage Bolts
Metric 8.8 Zinc Plated Carriage Bolts
Metric 8.8 zinc plated carriage bolts made from carbon steel with round heads and square shoulders. Class 8.8 strength provides high tensile capacity while zinc plating helps resist corrosion. Coarse metric threads and varied lengths suit general fastening and wood-to-metal assembly.
Diameter: M6

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20 mm
M6 x 1.0
50
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25 mm
M6 x 1.0
50
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30 mm
M6 x 1.0
25
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35 mm
M6 x 1.0
25
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40 mm
M6 x 1.0
25
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50 mm
M6 x 1.0
25
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Diameter: M8

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16 mm
M8 x 1.25
25
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20 mm
M8 x 1.25
50
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25 mm
M8 x 1.25
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30 mm
M8 x 1.25
25
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35 mm
M8 x 1.25
25
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40 mm
M8 x 1.25
25
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Metric 8.8 Plain FInish Carriage Bolts
Metric 8.8 Plain FInish Carriage Bolts
Metric 8.8 carriage bolts made from carbon steel with plain finish. Round heads with square shoulders and coarse metric threads provide high tensile strength (class 8.8) for structural fastening and improved clamp-up. Suitable for general assembly and wood-to-metal connections.
Diameter: M6

Length Thread Size Package Qty Item #
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20 mm
M6 x 1.0
50
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25 mm
M6 x 1.0
50
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30 mm
M6 x 1.0
25
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35 mm
M6 x 1.0
25
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40 mm
M6 x 1.0
25
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50 mm
M6 x 1.0
25
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60 mm
M6 x 1.0
25
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Diameter: M8

Length Thread Size Package Qty Item #
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20 mm
M8 x 1.25
50
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25 mm
M8 x 1.25
50
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30 mm
M8 x 1.25
25
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35 mm
M8 x 1.25
25
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40 mm
M8 x 1.25
25
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Aluminum Carriage Bolts
Aluminum Carriage Bolts
Aluminum carriage bolts in 2024-T4 alloy with coarse USS threads. Smooth round heads and square necks secure parts while minimizing weight and galvanic corrosion when fastening aluminum. Corrosion-resistant construction provides a lightweight, durable fastening solution.
Diameter Length Thread Size Package Qty Item #
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5/16"
3/4"
5/16"-18
25
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5/16"
1"
5/16"-18
25
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5/16"
1-1/2"
5/16"-18
25
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5/16"
2"
5/16"-18
25
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5/16"
2-1/2"
5/16"-18
10
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5/16"
3"
5/16"-18
10
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