براغي رأس أسطواني M20-2.5 X 140mm | رأس مسطح مع محرك سداسي داخلي | ملولبة جزئياً | فئة 12.9 من الفولاذ السبائكي مع أكسيد أسود حراري (10 / عبوة)

Needed something robust for a precision fixture setup, and these M20-2.5s threaded perfectly with their class 12.9 alloy steel. The black oxide finish held up well during the initial test fit, no galling at all.

Used these for a jig I was building on a heavy-duty press and the 12.9 alloy steel held perfectly under load—no stripping or flexing at all. The flat head seated flush without any need to countersink, which saved me time.

The threads are clean and the black oxide coating looks properly applied, not just a cheap paint job. I've torqued these into a jig plate and the hex socket drives without stripping, which is exactly what I need for repeated tooling adjustments.