M30-3.5×210mm 六角ボルト | クラス10.9 鋼 無処理 | 半ねじ (2本/袋)

Installed these on a heavy steel jig I’m building, and the 10.9 grade gives real peace of mind for high-torque tightening. The partial threading let me get a solid grip without bottoming out. Came well packed and clean out of the package.

The threads were clean and the hex head fit my socket perfectly for tightening a large piece of shop equipment. It's a heavy-duty bolt and feels solid, no doubt it will hold up under stress.

I used these for mounting a heavy jib crane arm, and the 210mm length worked perfectly to get through the structural steel without needing a coupling. The partially threaded shank made alignment easy, and the Class 10.9 steel feels rock solid under torque.