GB/T 1228~1231 thread specifications M12~M30, performance grade 10.9S, matched with 1 bolt+1 nut+2 washers
High strength bolt connection pair, made of 20MnTiB/40Cr/35VB alloy steel, heat-treated. Divided into friction type and pressure type, it is the main connection method for steel structures such as buildings, bridges, and towers, which generates frictional force and transmits force between plates by applying pre tension. Blackening/hot-dip galvanizing/Dacromet surface treatment.
Guozhi Technology's cold heading machines deliver precision, reliability, and intelligent performance — the smart choice for modern fastener manufacturing.
Certified by China National Quality Supervision and Testing Center, ensuring every component meets precision-grade manufacturing standards.
Intelligent control system boosts production efficiency by over 30%, with failure rates well below the industry average.
14B and 41B models are listed in Hebei Province's "First Set of Major Technical Equipment" catalog — nationally recognized quality.
Comprehensive technical support from installation and commissioning to after-sales maintenance, ensuring long-term reliable operation.
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