براغي رأس مقبس M5-0.8 X 100mm | رأس مسطح محرك سداسي | ملولبة جزئياً | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (100 / عبوة)

Needed some long, strong M5 bolts for a custom tooling fixture, and the 100mm length with 12.9 hardness handled the load perfectly. The black oxide finish gives them a nice, uniform look that resists minor scuffs during assembly. Very precise threads too, no binding issues at all.

Had to get longer bolts for a tooling project and these 100mm lengths fit the bill perfectly—the black oxide finish looks clean and seems durable. The hex drive seated firmly without stripping, which I always worry about with smaller sizes.

Used these on a jig for a machining fixture and the 12.9 alloy steel threads cut clean without any chips breaking off. The black oxide finish also held up well against the shop coolant, no rust after a week of use.