M6-1 x 28mm 內六角螺絲 | 六角驅動 | 全牙 | 12.9級合金鋼 熱處理黑氧化 (400顆/包)

I really appreciate the precise threading on these M6 screws — they seated perfectly in my jig fixture without any binding. The black oxide coating seems durable and gives them a clean, professional look. Definitely solid for precision assemblies.

The whole box arrived neatly packed, and the hex socket drive on these is machined so cleanly that my Allen key seats perfectly every time. I've used about a hundred of them in my jigs so far, and the 12.9 alloy definitely feels tougher than the cheaper screws I had before. Good value for a full 400

The black oxide finish on these screws is really consistent across all 400 pieces, which makes assembly look clean and professional. I used them for a jig I was building and the fully threaded length gave me plenty of grip in the material.