براغي غطاء مقبس M12-1.75 × 80mm | رأس مسطح سداسي محرك مقبس | ملولب جزئيًا | فئة 12.9 سبيكة فولاذ أكسيد أسود حراري (50/عبوة)

Machined a set of fixture plates over the weekend and these 12.9s torqued down clean without a single stripped head. The black oxide finish looks sharp and held up well against the cutting oil. Packaging was solid too, no rattling or damaged threads.

Pulled these out of the package for a jig I'm building—the black oxide finish feels smooth and even, and the partial threading grabbed just right in my tapped holes. No stripping or wobble when torqued down.

Needed some high-strength bolts for a custom tooling setup and these fit the bill perfectly. The partially threaded design made alignment much easier in a tight spot, and the black oxide finish survived a few drops without scratching.