GB/T 9125.1-2020
Fasteners for steel pipe flange joints-Hexagon head bolts
GB/T 9125.1-2020
Fasteners for steel pipe flange joints-Hexagon head bolts with fine pitch thread
GB/T 5782-2025
Hexagon head bolts
GB/T 5783-2025
Hexagon head bolts-Full thread
GB/T 31.2-2025
Hexagon bolts with split pin hole on shank-reduced shank
GB/T 32.2-2025
Hexagon head bolts with reduced shank
GB/T 1231-2024
High strength bolts with large hexagon head for steel structures