made of alloy steel with quenching & tempering heat treatment for high mechanical performance. The integrated flange under the head replaces separate washers, offering larger contact area to spread clamping force evenly. Serrated flange options increase friction to prevent loosening under continuous vibration.

Multiple anti-rust finishes including black oxide, electro-galvanized and hot-dip galvanized are available. Sizes range from M5 to M24, custom full-thread or partial-thread lengths are supported. It is widely used in auto chassis, construction machinery, solar brackets and heavy industrial equipment assembly.