براغي ذات رأس أسطواني M24-3 × 200 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 من سبائك الفولاذ المؤكسد بالأسود الحراري (10 / عبوة)

Installed these on a jig build and the class 12.9 alloy steel feels incredibly solid under torque. The thermal black oxide finish looks professional and hasn't shown any wear after a week of heavy use.

Put these into a jig for a precision assembly job and the black oxide finish looks great against the steel. The partially threaded design held torque perfectly without any stripping.

The black oxide finish is holding up well after a week of use in our assembly fixtures, no visible wear or rust. Threads engage smoothly and the 12.9 grade gives me solid confidence in the clamping force. Only gripe is the packaging could be sturdier, one screw had a slight scuff on the head.