GB/T 5782 thread specifications M1.6~M64, nominal length 12~500mm, performance level 5.6/8.8/10.9, tolerance level A (d ≤ 24mm and l ≤ 10d or l ≤ 150mm)/B
Refined hexagonal head bolts with high surface smoothness and dimensional accuracy. A-level accuracy is the highest, used for important connections; B-class is used for larger connections. Surface treatment can include galvanizing, blackening, etc. Widely used in mechanical equipment, precision structures, and other applications that require high connection accuracy.
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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