M12 Carriage Bolts

M12 12mm cup square carriage bolts offer reliable fastening for a variety of applications. Available in lengths from 25mm to 300mm, these zinc-coated bolts provide corrosion resistance and durability. The square neck design ensures a secure grip in wood or metal, preventing rotation during installation. Ideal for professional use, they deliver consistent performance in construction, machinery, and assembly tasks.

Available in various pack quantities with hex nuts, with hex nuts and washers and with hex nuts and penny washers of various sizes.

Browse our selection below. If you need more sizes please browse the full range of carriage bolts here or contact us.