a partial-thread fastener equivalent to ISO4014 and DIN931. It features an integrated smooth unthreaded shank, which delivers strong shear resistance and stable positioning under heavy load and vibration.

It is available in carbon steel grades 4.8 to 12.9 and A2-70/A4-80 stainless steel. Multiple anti-rust finishes including electro-galvanized, hot-dip galvanized and black oxide are optional. Custom non-standard lengths from M6 to M64 are supported. Widely applied in steel construction, engineering machinery, wind towers, heavy flanges and bridge projects.