M6-1 x 40mm 內六角圓頭螺絲 | 鈕扣頭六角驅動 | 全牙 | 12.9級合金鋼鍍鋅 (200顆/包)

Put a set of these into a new press brake jig I'm building and the hex drive seated perfectly without stripping. The zinc coating is nice and even, no flaking in the threaded areas. Exactly what I needed for precision work.

The hex socket drive is nice and deep, so the Allen key bites perfectly without stripping. I used them to rebuild a tooling fixture and all 200 pieces were cleanly threaded, no duds in the batch.

The 12.9 alloy steel is noticeably tougher than the 8.8 grade hardware I used before, and the zinc plating on these M6-1 x 40mm screws looks clean and even. The hex socket drive seated perfectly in my jig without any wobble.