M6-1 X 25mm 六角頭螺栓 | 10.9級鋼 本色 | 部分螺紋（400入）

The threading is clean and consistent on every screw, and the hex heads hold a socket wrench perfectly without slipping. I needed a batch this size for a trailer frame repair, and they've been rock solid so far.

I used about 60 of these M6-1 x 25mm cap screws for a jig assembly, and the partial threading made alignment much easier. The 10.9 steel feels solid and the hex head sits perfectly in my socket driver.

The hex head on these M6 screws grabs my socket perfectly without slipping, which makes assembly on my shop jig much smoother. Class 10.9 steel feels reassuringly tough, and having 400 in one package means I won't run out mid-project. A solid, no-fuss fastener for general industrial work.