Carriage bolts have a domed head and square neck that locks into timber or a square hole so the nut can be tightened from the other side. We stock DIN 603 / ISO 8677 in Umm Al Quwain from M6 to M30 in grade 4.6, 8.8 and stainless A2 / A4, zinc plated and hot-dip galvanized, with nuts and washers.
A carriage bolt (cup square hex bolt, coach bolt) has a smooth, low-domed head with a square section directly beneath it. Pulled into a timber member or a square punched hole, the square neck prevents the bolt turning, leaving a tamper-resistant smooth head on the outside. It is the standard bolt for timber construction, playground equipment, guard rails and any place where the head must be smooth and inaccessible.
Applications
- Timber decking, pergolas and fencing
- Playground and outdoor furniture
- Guard rails, barriers and signage
- Truck bodies, trailers and tailgates
- Cable ladder and strut channel
- Precast handling and formwork
Standards, grades & finishes
Bolts to DIN 603 / ISO 8677 (round head square neck), property class 4.6 and 8.8 to ISO 898-1, stainless A2 / A4 to ISO 3506, threads ISO 965 6g. Imperial to ASME B18.5. Nuts DIN 934, washers DIN 9021 large series. Finishes zinc plated to ISO 4042, hot-dip galvanized to ISO 1461.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.