M6-1 x 16mm 內六角螺絲 | 內六角驅動 | 全螺紋 | 8.8級合金鋼 熱處理黑色氧化 (600個/包)

Installing these into some jig tooling and the 16mm length was exactly what I needed for a snug fit through a bracket. The black oxide finish seems durable enough to resist minor scratching during assembly, which is a plus.

The hex socket drive made tightening these into tight spots on my jig build much easier than using a hex key on a standard bolt. They threaded smoothly into pre-tapped holes without any binding. A solid choice for precision assembly work.

Just finished a tooling fixture and these M6-1 x 16mm screws held everything rock solid—the black oxide finish feels grippy in the hex socket, and the fully threaded shaft made alignment a breeze. Six hundred in the box means I won't be reordering for a while.