براغي رأس مقبس M6-1 × 200 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 فولاذ سبائكي أكسيد أسود حراري (50/عبوة)

The black oxide finish on these M6 screws has that nice matte, slightly oily feel that lets them grip the hex key without any slipping. I torqued them down to spec on a fixture, and the 12.9 grade held firm—no deformation, no stripped heads.

I needed 200mm bolts for a custom jig build, and these fit perfectly with no slop in the hex socket drive. The black oxide coating looks clean and professional, and the partial threading made aligning the fixture easy.

The 12.9 grade is no joke—these bolts held up perfectly in a tight assembly where I couldn't risk any give. The black oxide finish looks clean and didn't flake during install with a hex key. Threads were consistent down the full 200mm, which I've had issues with on cheaper sets before.