Cup Head Square Neck Bolt/Carriage Bolt is used in both marine as well as treated wood applications. Jay Tee Fastners is the manufacturer of Cup Head Square Neck Bolt/Carriage Bolt. Jay Tee Fastners is an ISO 9001:2008 company. Jay Tee Fastners also manufactures wide ranges of bolts, nuts, studs, thread bars, washers, Circlips, foundation bolts, hex nuts, hex bolts, wing nuts, turned components etc. Cup Head Square Neck Bolt/Carriage Bolt consists of rounded head with four nubs or fins, which prevent the bolt from turning in the timber. This Cup Head Square Neck Bolt/Carriage Bolt comes in various grades, shapes, sizes and thickness.