براغي ذات رأس أسطواني M16-2 × 300 مم | محرك سداسي داخلي | ملولبة جزئيًا | فئة 12.9 سبائك فولاذ أكسيد أسود حراري (10/عبوة)

Used a set for a jig build on a custom machine table and the threading cut cleanly, no binding issues at all. The black oxide finish held up great against minor oil exposure during assembly.

I was a bit skeptical about the black oxide finish holding up under heavy jig use, but these M16-2 screws have shown no wear after repeated assembly cycles. The 300mm length fits perfectly in my precision setup.

These threads seated cleanly into my jig fixture without any binding, which is exactly what I needed for this precision assembly. The hex socket drive grips well with a standard Allen key, and the partially threaded length gives good clamping range. Class 12.9 feels reassuringly solid for heavy mach