براغي ذات رأس أسطواني M42-4.5 × 140mm | محرك سداسي | ملولبة جزئياً | فئة 12.9 فولاذ سبائكي أكسيد أسود حراري

The black oxide finish held up perfectly when I torqued these down on a press fixture—no galling at all. The hex socket drive was a lifesaver in a tight spot where a wrench wouldn't fit. These feel solid enough for any heavy-duty tooling job.

Had to torque these down to 180 ft-lbs on a press fixture and the hex socket held perfectly without any stripping. The black oxide finish cleaned up easily with a quick wipe, which was a nice surprise.

Installed these in a heavy jig fixture and the Class 12.9 alloy steel handles the torque without any flex. The hex socket drive seated perfectly with my wrench, and the 140mm length gave just enough thread engagement. Exactly what I needed for tooling work.