六角頭螺絲 M20-2.5 x 200mm | 等級10.9 鋼 無鍍層 | 部分螺紋 (10入/包)

Threading is nicely clean and the hex head fits a standard socket wrench perfectly. Needed these for a heavy-duty jig I'm building, and the 10.9 steel feels solid under torque.

These bolts threaded smoothly into my lathe stand without any binding, and the hex head gave my socket wrench a solid grip. The partially threaded shank let me get a tight hold on the frame without bottoming out.

Used these to bolt down a heavy press in the shop—the 10.9 grade held torque perfectly without any stretch. The partial threading made alignment easier than I expected on the thicker flanges.