9/16-18 x 4" 六角ボルト | グレード5鋼イエロー亜鉛 | 部分ねじ (25個/パッケージ)

I needed a bolt for a heavy-duty farm jack repair, and these 4-inch Grade 5 screws handled the load without any flex. The yellow zinc coating looks decent and should resist rust better than plain steel.

The hex heads sat perfectly flush in my socket wrench during a trailer hitch install, and the partial threading gave just the right grip without bottoming out. Much sturdier than the cheap bolts at the big box store.

I used these to repair a heavy-duty tractor hitch, and the partial threading made it much easier to align the bolts into the frame. The grade 5 steel held up perfectly under the torque.