Grade 10.9 hex flange bolts made from alloy steel with quenching and tempering. The integrated flange under the head replaces separate washers and provides a larger contact area to spread clamping force evenly. Serrated flange options are available to increase friction and help resist loosening under continuous vibration.

Available sizes range M5 to M24, with full-thread or partial-thread lengths made to order. Common anti-rust finishes include black oxide, electro-galvanized and hot-dip galvanized; confirm finish and length when ordering. Typical applications include auto chassis, construction machinery, solar brackets and heavy industrial equipment assembly.