M36-4 X 150mm 外六角螺絲 | 10.9級鋼本色 | 半牙 (2入/包)

Installed these on a grain auger gearbox flange and the 10.9 grade steel held torque perfectly without any stretch. The partially threaded shaft gave just enough grip for the heavy load without bottoming out in the blind hole.

Perfect size for the heavy machinery I’m working on; the hex head gave my socket wrench a solid grip without slipping. These bolts feel tough and durable, exactly what you’d expect from class 10.9 steel.

The threads are cut clean and the hex head takes a socket without any play, so these seated perfectly when I bolted down the press frame. Class 10.9 rating gives me confidence they'll hold up under the load, and getting two in the pack is a nice bonus for the price.