براغي رأس أسطوانية M12-1.25 X 30mm | محرك سداسي داخلي | كاملة الخيوط | درجة 12.9 من سبائك الصلب مع أكسيد أسود حراري (100/عبوة)

Used a handful on a tooling fixture I'm building, and the hex socket drive fit perfectly with no slipping. The black oxide coating looks clean and professional once installed, which is a nice bonus.

Pulled these out of the package for a jig assembly, and the black oxide finish looks really consistent across all 100 screws—no bare spots. Threads cut cleanly into the nut without binding, which is exactly what I needed for tooling.

The hex socket drive grips the Allen key perfectly, no wobble. These bolts threaded smoothly into my tooling fixture and the black oxide finish looks clean. Exactly the Class 12.9 strength I needed for a precision assembly.