| Item | Specification |
| Material | Carbon Steel, Alloy Steel, Stainless Steel (SS304/SS316) |
| Diameter Range | M6 – M20 |
| Length Range | 20mm – 300mm |
| Thread Type | Full Thread / Partial Thread |
| Grade | 4.8, 8.8, 10.9, A2-70, A4-80 |
| Head Type | Round Head with Square Neck |
| Standard | DIN 603 / ISO 8677 / ANSI / BS 4933 |
| Surface Finish | Plain, Zinc Plated, Yellow Zinc, Black Oxide, Hot Dip Galvanized |
| Packing | Bulk, Small Box, Carton + Pallet, Customized |
Square Shoulder Bolts, also known as Carriage Bolts, are fasteners featuring a rounded head with a square shoulder beneath it. The square shoulder locks the bolt into place when inserted into wood or metal, preventing rotation during tightening. These bolts provide strong clamping force and a clean, finished appearance.
Made from high-quality carbon steel or stainless steel, and often available with corrosion-resistant coatings, they are suitable for indoor and outdoor applications in construction, furniture, decking, and timber framing.