M42-4.5 X 130mm 內六角螺絲 | 六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑色氧化

Installed a set of these on a custom tooling fixture and they seated perfectly with the hex drive. The black oxide finish looks durable and the 12.9 grade gives me confidence in high-torque applications.

The black oxide finish on these M42 screws really resists oil and grime in my press tooling. They thread smoothly into tight spots thanks to the hex socket drive. Exactly the strength I needed for a heavy jig assembly.

These are the strongest M42 socket cap screws I've worked with in a while. The thermal black oxide finish gives them a nice uniform look and the threads are cut perfectly clean on all ten I ordered.