7/8-9 x 5-1/4 英吋重型六角頭螺絲 | ASTM A193 B7 合金鋼 原色 | 部分螺紋 (40 個/包)

The threads are clean and the grip on the shank feels solid, so these B7s are holding my press frame together without a hint of play. For a 40-pack of this size, the heat-treated alloy is exactly what I needed for the heavy load.

The partially threaded length is exactly what I needed for a heavy machinery jig, and the alloy steel feels rock-solid under torque. Pack of 40 means I’ve got spares for the next job, too.

Pulled them out of the package and the black oxide finish is consistent across all forty bolts, no flaws or bare spots. They threaded into the tapped holes on my press with minimal effort and held tight under full torque.