5/16-24 X 2-1/4" 六角頭螺絲 | 5 級鋼黃鋅 | 部分螺紋 (100 個/包)

These are exactly what I needed for a heavy equipment repair—the Grade 5 steel feels tough and the yellow zinc coating looks like it'll resist rust well. The partially threaded design made them easy to start by hand before tightening with a wrench.

The hex heads are cut clean, so my socket grips them without any slip, and the partial threading makes aligning the bolt in tight spots much easier. Tossed a dozen into my equipment frame and every one seated flush with no binding through the zinc.

These came in a sturdy box and the threads are cut clean, no burrs. The yellow zinc finish looks uniform across the whole batch, so they'll be easy to spot in my spare parts bin.