M6-1 x 45mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼鋅鍍 (200/包)

Used these to replace old bolts on a milling fixture and the 12.9 grade holds torque perfectly without stripping. Threads were clean and the zinc coating is even, no burrs. Exactly what I needed for heavy-duty tooling work.

Installed these in a jig I'm making and the partially threaded design grabbed perfectly without bottoming out. The hex socket drive made tightening them down in tight spaces a breeze.

For the price and the class 12.9 hardness, these bolts are a steal for my jig builds—tight tolerances, and the zinc plating looks clean out of the package.