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carriage bolt-0

Bolt

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Carriage Bolt

Carriage Bolt

Parameter Category Description
Thread Standard Metric (ISO): M6–M24; Imperial (UNC): 1/4"–1"
Material & Grade Carbon steel: Grade 4.8/8.8 ; Stainless steel: 304/316  ; Hot-dip galvanized steel 
Surface Treatment Zinc-plated; Hot-dip galvanizing ; Passivation; Black oxide coating 
Size & Dimensions Shank length: 25mm–300mm; Head diameter: 1.5× thread diameter  ; Square neck size: matches thread diameter for secure locking
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Structural Features

Smooth domed head, square neck, and partially threaded shank (metric/imperial 60° threads). Chamfered end for easy alignment. Used with flat washers and hex nuts; square neck prevents spinning and allows one-handed installation.

Performance Advantages

Rotation-proof square neck for tool-free installation; safe, clean domed head; high tensile strength; corrosion-resistant finishes; compatible with wood, steel and aluminum.

Applications

Wood decks, fences, trailers, highway guardrails, outdoor furniture and agricultural machinery.

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