1/2-13 x 3-1/4" 六角頭螺絲 | 5級鋼 黃鋅 | 部分螺紋 (25 / 包)

The partial threading on these 1/2-13 screws is perfect for when you need a solid clamp without the threads chewing into the work surface. The yellow zinc coating looks clean and the hex head grabbed a socket wrench without any slipping. I used most of the box on a shelving rack rebuild and they’re

These hex head screws are holding up well on a heavy-duty jig I built. The partial threading makes them ideal for applications where you need a smooth shank.

Finally, a bolt that threads smoothly right out of the pack—the hex head held a socket perfectly without any slippage. Used them to rebuild a press, and the Grade 5 steel feels solid enough for the job.