براغي رأس أسطوانية مقاس M5-0.8 × 18 مم | محرك سداسي | خيط كامل | فولاذ سبائكي فئة 12.9 معالجة حرارياً بأكسيد أسود (600/عبوة)

All 600 screws came in one neat box, and the hex socket drive seats perfectly every time so far. Used them to rebuild a small jig at my shop and the 12.9 alloy steel feels seriously solid for the price. Definitely stocked up for future machine work.

Bought these for a precision fixture assembly, and the Class 12.9 alloy steel feels noticeably tougher than the standard hardware I've used before. The black oxide finish took a bit of oil to look consistent out of the package, but once installed they hold torque perfectly without stripping.

Used these to rebuild a jig for my CNC machine and every single screw threaded in smooth without binding. The black oxide finish looks great and hasn't shown any wear after a week of use. Exactly what I needed for precision assembly work.