M6-1 X 6mm 內六角螺絲 | 圓頭內六角驅動 | 全牙 | 12.9級合金鋼 熱處理黑色氧化 (400 / 包)

Had to replace some worn-out bolts on a jig and these M6 button heads fit perfectly. The black oxide finish seems durable and the hex socket engaged cleanly without stripping. Exactly what I needed for the shop.

These little black oxide screws were perfect for securing a jig I built in my shop; the hex socket drive made installation much easier than with a standard hex bolt. They're threaded all the way, which let me get a solid hold even in thinner materials.

The hex socket drive on these M6 screws grips perfectly without stripping, and the 12.9 grade alloy steel feels incredibly tough. I used them for a jig build and they seated flush every time.