GB/T 898 (bm=1.25d)/GB/T 899 (bm=1.5d) Thread specifications M5~M48, performance level 4.8/8.8
BM=1.25d is used for cast iron bodies, BM=1.5d is used for softer materials such as aluminum alloys, and the connection strength is ensured by increasing the screw in length. Widely used in engine cylinder heads, pump body connections, steel structure medium thick plate connections, and other parts that require high-strength bolt connections.
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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