About Carriage Bolts
Carriage bolts are fastening components identified by their smooth, rounded heads and integrated anti-rotation neck design. This neck embeds into the mating material during installation, preventing unwanted movement while tightening or loosening the nut. Such construction makes these bolts especially reliable for load-bearing joints involving wood or metal.
Depending on application demands, carriage bolts are produced with different neck formations such as square, ribbed, finned, oval, and elliptical profiles, each offering varying resistance against pull-through and rotation. Installation is typically completed using hexagonal nuts, though certain applications allow direct fastening into prepared and pre-machined holes.
Also marketed under names like timber bolts, track bolts, and mushroom head bolts, carriage bolts are supplied in a broad selection of metric and imperial dimensions. Available thread systems include UNC, UNF, UN, and ISO metric standards. With manufacturing options spanning numerous materials, mechanical grades, and ASTM-compliant specifications, carriage bolts are widely selected for use in infrastructure projects, industrial machinery, furniture fabrication, and general construction work.
Carriage Bolts Properties
| Property | Details |
|---|---|
| Manufacturing | Hot Forged / Cold Forged |
| Metric Size | M3 to M72 |
| Imperial Size | 1/4” to 3” |
| Threads | Metric, UNC, UNF, BSW |
| Form | Fully Threaded / Partially Threaded |
| Standards | ASTM, ASME, DIN, ISO, BS, IS |
| Sub Types | As per product category |
Carriage Bolts Standards
| Standard | Size Range |
|---|---|
| ASME B18.2.1 / B18.2.2 | 1/4” to 3” |
| ASTM A194 / A193 | M6 to M72 |
| DIN 934 / DIN 6914 | M6 to M72 |
| ISO 4032 / ISO 7412 | M6 to M72 |
| BS 1769 | 1/4” to 2” |
| IS 1363 | M6 to M72 |
Carriage Bolts Specification
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Check Nuts Weight Chart and Bolts Weight Chart to estimate quantities accurately for your project.
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