5/16-18 X 5-1/2" 六角頭螺栓 | 5級鋼鍍黃鋅 | 部分螺紋（50顆/包）

The half-inch thread length on these is spot on for when I need to bolt through thick brackets and still grab a lock washer. The yellow zinc finish looks uniform across all fifty pieces, and the hex heads haven't stripped once under my impact driver. Very solid box of hardware for the shop.

The yellow zinc finish on these looks clean and uniform, and the partial threading grabbed perfectly when I bolted a bracket to a steel frame. All fifty came out of the package straight with no burs, so I didn’t have to chase any threads.

I needed some longer 5/16 bolts for a custom bracket and these partially threaded ones gave me just the right amount of grip without needing extra washers. The hex head sat deep in my socket and didn't strip out at all.