1-1/4-7 x 4-1/2" 重型六角頭螺絲 | 美國製造 | A307B 等級鋼鋅 plating | 部分螺紋 (15 顆/包)

The zinc plating on these is even and smooth, and the threads caught perfectly on the first try. I used them to secure a heavy-duty bench to concrete anchors, and they haven't budged.

Used a few of these to bolt down a piece of equipment at the shop, and the partially threaded length grabbed perfectly without any wobble. The zinc coating is holding up fine so far, no rust after a couple of rainy days outside. Exactly what I needed for a solid, no-nonsense connection.

The partial threading made these grab perfectly when I was assembling a heavy-duty press frame. They threaded in smoothly without any binding, and the zinc coating looks clean and consistent.