براغي رأس أسطوانية M3-0.5 × 35 مم | محرك سداسي داخلي | ملولبة جزئياً | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراري (400 / عبوة)

The hex sockets on these M3 screws seat perfectly on my driver, and the black oxide finish looks sharp on my jig build. Counted them out to be sure, exactly 400 in the box, and the 35mm length is just right for the clearance I needed.

Exactly 400 in the pack, and the class 12.9 steel feels noticeably tougher than standard screws I've used before. The black oxide finish held up perfectly while I was torqueing them into a jig.

Installing these on a tooling fixture, the 12.9 alloy steel feels exceptionally sturdy, and the black oxide finish gives them a clean, professional look. Thread engagement is smooth across all 400 pieces.