7/8-9 × 4" 六角頭螺絲 | 8級鋼鍍鋅 | 部分螺紋 (45/包)

Finally a bolt that doesn't strip under high torque—the hex head grabbed my socket perfectly. These grade 8s are way tougher than the grade 5s I was using before, and the zinc plating looks clean out of the package.

The partial threading on these 7/8-9 screws made a big difference for my assembly work—easier to start by hand before torquing them down. The zinc plating looks clean and the Grade 8 steel gives me confidence they'll hold up under heavy loads. Exactly what I needed for the price.

I needed some heavy-duty hex heads for a steel frame jig I’m building, and these Grade 8 zinc-plated screws fit the 7/8-9 size perfectly without slipping. The partially threaded section held tight in the tapped holes while the smooth shank let me adjust alignment easily. For the price per 45, these