1"-8 x 8-1/2" 重型六角頭螺絲 | ASTM A193 B7 合金鋼無處理 | 部分螺紋（20個／包）

I’ve been using these fasteners on a heavy-duty conveyor frame and the threads cut cleanly without binding, which saved me time. The hex heads give a solid wrench grip even after torquing to spec.

These are hefty bolts. The 1"-8 thread pitch is exactly what I needed for a heavy equipment jig, and the partially threaded design left plenty of solid shank for alignment. Twenty in the package feels like a fair deal for B7 alloy steel.

The threads engaged cleanly with zero galling when I torqued these down on a flange joint, and the partial threading gave me the grip length I needed without bottoming out. For twenty pieces of B7 alloy at this size, the price felt fair.