Carriage Bolts — Bulk Suppliers
47 vetted U.S. suppliers · 24 states
Carriage bolts in bulk — pallet-and-skid quantities, distributor pricing — are sourced from a specific set of fastener wholesalers serving deck-builders, pole-line contractors, and treated-lumber assemblers. Below is our live count of vetted U.S. suppliers, with one-click RFQs to multiple at once.
Geographic distribution
Where these suppliers are
Top 8 states by vetted-supplier density. 20 more across 16 additional states — listed below the chart.
Also covered
Hawaii (2) · Nevada (2) · Mississippi (2) · Texas (2) · Delaware (1) · Idaho (1) · Oregon (1) · Tennessee (1) · Pennsylvania (1) · Utah (1) · Florida (1) · Wisconsin (1) · Vermont (1) · Nebraska (1) · Arizona (1) · Alabama (1)
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What carriage bolts are
Carriage bolts (also called coach bolts) have a smooth, rounded head with a square neck below — when driven into wood, the square neck bites into the lumber and prevents the bolt from rotating, allowing one-person tightening from the nut side only. Spec'd per ASME B18.5 (inch) or DIN 603 (metric). Common materials: carbon steel (zinc-plated, hot-dip galvanized, or plain), 18-8 stainless. Bulk quantity = skid- or barrel-pack distributor volume, typically 250-1000+ pieces per box.
What to look for in a supplier
Match the finish to the application: hot-dip galvanized for outdoor/pressure-treated lumber work (the chemicals in modern pressure-treat lumber attack zinc-plated bolts fast); stainless for marine docks, saltwater exposure, and architectural; zinc-plated for indoor or protected. For bulk distributor volume, ask about pallet quantities, mixed-size pallet options (some suppliers ship pallets of mixed lengths in one size), and lead time on common sizes. Country-of-origin matters for some federal and Buy America work; confirm domestic vs. imported. Pressure-treated-lumber compatibility is the trap — modern ACQ-treated lumber requires either HDG or stainless, not standard plating.
FAQ
Common questions
Can I use zinc-plated carriage bolts with pressure-treated lumber?
No. Modern pressure-treated lumber (ACQ, copper azole) is significantly more corrosive to plated steel than older CCA-treated wood. Use hot-dip galvanized (HDG) or stainless for any contact with modern treated lumber — zinc-plated bolts will corrode through within months in outdoor service.
What's the difference between coach bolts and carriage bolts?
Same fastener, different name. "Carriage bolt" is the U.S. term; "coach bolt" is the UK / Australian term. ASME B18.5 (U.S.) and DIN 603 (European) are functionally equivalent for the standard sizes.
What sizes do carriage bolts come in?
Standard sizes run ¼" through ¾" diameter, in lengths from ¾" through 12". Distributors typically carry the common combinations in mill-pack volume; non-standard lengths or diameters above ¾" can be quoted but lead time extends.
Are carriage bolts as strong as hex bolts?
For typical wood-frame applications, yes — both are Grade 2 or Grade 5 equivalents depending on supplier spec. The geometry is different (carriage bolt's square neck is the engagement feature, not a torque-bearing detail) but tensile strength is comparable for similar diameter and grade.
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