Bolts
Carriage Bolts (Coach Bolts) Manufacturer, Wholesaler, Supplier & Exporter
Carriage bolts feature a smooth round head and a square neck that self-locks into timber or a matching square hole, preventing rotation during tightening. We manufacture and export these to DIN 603 / ISO 8677 in steel and stainless steel.
The square neck under a carriage bolt's head is the whole point of the design: as the nut is tightened, the neck pulls itself into a matching square hole or embeds into timber, stopping the bolt from spinning even though there's nothing to hold a wrench against on top. That self-locking behavior is why carriage bolts remain the standard choice for one-person installation on decks, fences, and playground equipment, where a second wrench simply isn't practical.
Buyers occasionally spec a carriage bolt for a metal-to-metal joint expecting the same anti-rotation behavior they'd get in timber — but without a matching square (or round) punched hole, the neck just spins freely against a round hole in sheet metal, defeating the design entirely.
Minimum Order — Container Quantity (Approx.)
A standard 20ft container (~20 tons) holds approximately 350,000-500,000 pieces of carriage bolts in common sizes (M8-M10). Exact quantity depends on size and length and is confirmed at quote time.
You don't need a full container to order. Hurain Engitech & Trade — the group Global Fasteners Exports operates under — regularly ships smaller, partial-container (LCL) orders of just a few pallets or boxes for buyers who don't yet need FCL volume, consolidated with other cargo to keep freight cost reasonable.
Specifications
Standards
DIN 603, ISO 8677, ANSI/ASME B18.5.
Size range
M6 to M20 metric; 1/4" to 3/4" imperial.
Head
Round head with square neck for anti-rotation.
Finish
Hot-dip galvanized, zinc plated, or plain.
Applications
Timber & deck construction
Structural timber connections requiring a flush, tamper-resistant head.
Playground & outdoor structures
Public structures where a smooth exposed head reduces injury risk.
Fencing & gates
Metal fencing and gate hardware.
Agricultural equipment
Trailer decking and equipment guards.
Materials Available
Steel
Corrosion-resistant
Galvanizing thickness and dimensional tolerance are verified against DIN 603 / ISO 8677 before shipment.
How We Manufacture & Export This Product
- 1
Spec confirmation
Confirm size, length, and finish requirement.
- 2
Cold heading
Square-neck forming and round-head cold heading.
- 3
Galvanizing/plating
Hot-dip galvanizing or zinc electroplating for corrosion protection.
- 4
Export packing
Bulk boxes or bins suited to hardware distribution and container loading.
Export Track Record
Regularly supplied to timber construction and outdoor structure fabricators.
Real-World Use Cases
Timber decking and structures
The neck embeds into the wood grain as the nut is tightened, holding the bolt still without a second wrench.
Playground and public structures
A smooth, tamper-resistant exposed head reduces snag and injury risk on public equipment.
Fencing and gate hardware
Metal fencing panels and gate frames where a flush, non-rotating head is preferred.
Common Mistakes Buyers Make
Using carriage bolts in round metal holes
Without a square hole for the neck to key into, the bolt spins freely and can't be tightened one-handed.
Skipping galvanization on outdoor timber structures
Plain-finish carriage bolts rust and stain timber long before the structure's service life ends.
Under-sizing the washer under the nut
A standard washer can pull through softer timber under load — a fender washer spreads the clamping force more safely.
Glossary of Terms
- Square neck
- The square-section shoulder under a carriage bolt's head that keys into a matching hole or embeds into timber to prevent rotation.
- Coach bolt
- The common UK/European name for a carriage bolt.
- Fender washer
- An oversized, thin washer that spreads clamping load across a wider area — often paired with carriage bolts in timber.
Quality Inspection We Perform
Dimensional inspection
Thread gauge, length, diameter, and head/drive geometry checked against the specified standard.
Material verification
Grade and material composition confirmed against the order specification, with mill test certificates on request.
Mechanical testing
Tensile strength, hardness, and proof-load testing on sample batches, particularly for structural and high-tensile grades.
Finish & coating check
Plating thickness, galvanizing coverage, or passivation quality inspected before packing.
HS Code & Customs Classification
Most fasteners fall under HS Chapter 73 (articles of iron or steel) or Chapter 74/76 for brass and aluminum items — the exact 8-10 digit subheading depends on the specific product and material. We include the HS code on the commercial invoice; confirm the applicable import duty with your customs broker, since rates vary by country and trade agreement.
Packaging & Export Labeling
Export packing is chosen to survive ocean freight and container loading without corrosion or damage: corrosion-protected paper or oil coating where needed, then cartons, drums, or bulk bags, palletized or crated for the container. We can match specific labeling, barcoding, or carton-marking requirements for OEM and repeat buyers.
Countries We Export Carriage Bolts To
View all markets →Buying guide
How to Choose a Reliable Carriage Bolts (Coach Bolts) Manufacturer, Wholesaler, Supplier & ExporterWhat to check before ordering carriage bolts for timber, deck, or public-structure projects, from square-neck fit to galvanizing quality.
Frequently Asked Questions
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