1/4-28 X 2-1/4" 六角頭螺絲 | 5級鋼黃鋅 | 部分螺紋 (200個/包)

I needed stronger bolts for a piece of heavy equipment and these grade 5 hex heads handled the torque without stripping. The yellow zinc finish seems like it will resist rust well.

The partial threading on these is perfect for when you need a solid grip without bottoming out, and the yellow zinc finish looks clean right out of the box. I’ve used a dozen so far on a jig build and every single one seated without any binding.

The thread ran clean and the hex head seated perfectly with my socket wrench. Used these to fasten a jig base on a drill press table and they held tight without stripping. Good solid fasteners for the price.