六角頭螺絲 M6-1 x 40mm | 等級8.8 鋼 無鍍層 | 部分螺紋 (400入/包)

The partial threading on these M6s is exactly what I needed for clamping two plates without bottoming out, and the 8.8 steel feels rock solid under a wrench. The hex heads seated cleanly in my socket driver and the whole 400-count box came organized. I've already used a dozen on a jig build and they

I was worried about stripping these M6 bolts during a frame assembly, but the partial threading made alignment straightforward. The hex head grabbed my socket firmly without any wobble.

The hex drive on these made tightening them in a crowded panel much easier than I anticipated. The 40mm length and partial threading gave just the right grip for securing a motor mount.