M16-2×100mm 內六角螺絲 | 內六角驅動 | 半牙 | 強度等級12.9 合金鋼 鍍鋅 (25顆/包)

The zinc plating looks uniform and clean, no rough edges on the threads either. I used these to hold a jig together on a mill and the M16 hex socket seated perfectly without any wobble. These are exactly what I needed for the price.

Class 12.9 strength is the real story here—these M16s torqued down into my fixture without any worries about stripping. The 100mm length gave just enough reach for the threaded portion to bite cleanly through my jig plate.

The partial threading on these M16-2 screws made aligning them in my jig much easier than fully threaded ones. The hex socket drive gave a solid grip with no stripping. They feel tough and well-made for heavy tooling work.