M18-2.5×30mm براغي ذات رأس أسطواني بمقبس سداسي | كامل الخيط | فئة 12.9 سبيكة فولاذ أكسيد أسود حراري (25/عبوة)

I was working on a jig for a precision assembly and these threaded perfectly into some tight spots without stripping. The hex socket drive made installation easy, and the black oxide finish seems like it'll hold up well.

These black oxide screws fit perfectly in my jig fixture—the hex socket drive made installation a breeze with my Allen key. The class 12.9 alloy steel feels incredibly sturdy for the load I'm putting on them.

The black oxide finish on these screws is holding up well in a machining fixture I use daily, and the hex socket drive makes installation easy with no stripping issues. They thread smoothly into tapped holes, which saves time during setup. Only wish the package included a few extras for the price.