1-1/4-7 X 5-1/2" 重型六角頭螺栓 | 美國製造 | A307 B級鋼鍍鋅 | 部分螺紋（每包15件）

The heads are machined clean, so my 1-1/8" socket seats perfectly on every one. Zinc plating looks uniform and these heavy hex screws torqued down without any galling on the threads—solid purchase for the price.

The zinc plating looks clean and even on every screw, and the threads started smoothly without any binding. I used them to fasten a heavy bracket to a steel beam, and the grip feels solid under load.

These things are beefy as hell, and the partial threading makes them perfect for clamping down thick steel brackets without the threads chewing up the holes. The zinc coating looks clean and even, so they should hold up fine in my shop's humid air.