7/8-9 X 3-1/4" 重型六角頭螺絲 | ASTM A193 B7 合金鋼原色 | 部分螺紋 (55 / 包)

Threads cut clean and the partially threaded length made alignment a lot easier on our press frame. These B7s torqued down smoothly without any galling, and the 55-count box will last us a good while.

Installing these on a heavy pump base, the hex head gave my socket a solid grip without any rounding. The partial threads started clean and the 3-1/4" length was just right for the flange thickness.

Threads were clean and the partial threading made seating them in existing tapped holes a breeze. The 7/8-9 pitch grabbed perfectly on our pump base, and all 55 in the pack measured true. These are solid workhorse bolts for the price.