براغي رأس كبس M14-2 × 55 مم | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 مع أكسيد أسود حراري (50 / عبوة)

Installed these on a jig that sees daily use, and the hex socket drive made tightening them down in tight spaces much easier. The 55mm length was exactly what I needed to secure a thick bracket, and so far the black oxide hasn't shown any wear.

These M14-2 x 55mm screws fit perfectly into my jig build, and the black oxide coating seems much tougher than standard black oxide. The hex socket drive engaged cleanly without any wobble.

I needed some high-strength fasteners for a jig I was building, and these 12.9 alloy steel screws fit the bill perfectly. The hex socket drive seated cleanly without any stripping, and the 55mm length was just right for my application.