براغي رأس كبس M36-4 × 80 مم | محرك سداسي | ملولبة بالكامل | فئة 12.9 من سبائك الصلب مع أكسيد أسود حراري (2 / عبوة)

Threading is clean and smooth right out of the pack, no burs or rough spots. The black oxide finish has held up well during installation, and the hex socket drive grabbed perfectly with no stripping. These feel like real quality for precision assembly work.

I needed some heavy-duty fasteners for a jig I was building, and these M36-4 x 80mm screws fit perfectly. The hex socket drive made installation easy, and the black oxide finish looks clean and professional.

The black oxide finish on these M36 screws handled my shop's humidity without a speck of rust, and the hex socket drive seated perfectly with my torque wrench. Class 12.9 strength gives me total confidence in the heavy machinery fixture they're holding together now.