Carriage bolts have a domed head with a square neck beneath it that bites into the timber or soft material as the nut is tightened, locking the bolt against rotation so it can be fitted from one side only. Used in timber framing, agricultural equipment, fencing and crating.
Supplied in bulk to distributors, importers and hardware brands worldwide, including private-label packaging in the customer's own branding. Non-standard sizes and made-to-drawing variants are produced to order, with a material test certificate on every consignment.
| Product Type | Cup head square neck bolt (carriage bolt) with hex nut |
| Standards | DIN 603, ISO 8678, ASME B18.5 |
| Material Grades | Mild steel Grade 4.6 / 4.8, Grade 8.8, SS 304 (A2), SS 316 (A4) |
| Size Range (Metric) | M5 to M20 |
| Size Range (Imperial) | #10 to 3/4" UNC |
| Length Range | 16 mm to 300 mm (1/2" to 12") |
| Head / Drive Type | Domed (mushroom) head with square neck — no drive, anti-rotation |
| Finish | Self colour, zinc plated (ISO 4042 / ASTM B633), hot dip galvanized, passivated stainless |
| Custom Options | Ribbed neck, large-head pattern, part or full thread, made to drawing |
| Certification | Material Test Certificate, EN 10204 3.1 |
| Packaging | Boxed in standard counts, bulk cartons, or private label to customer specification |
