براغي رأس أسطواني M42-4.5 × 180 مم | محرك سداسي داخلي | ملولبة جزئياً | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراري

Installed these in a custom jig I’m building, and the 180mm length gave me just the right amount of thread engagement. The hex socket drive felt solid with my torque wrench, no stripping. Class 12.9 strength gives me peace of mind for the load.

The black oxide finish on these is really uniform and gives them a professional look for my jigs. They threaded smoothly into my fixture plate with no binding.

The 12.9 grade and black oxide finish make these feel seriously industrial, and the partial threading is perfect for clamping thick plates in my press setup. They torqued down smooth without any galling, which is more than I can say for cheaper cap screws I’ve used.