براغي رأس سداسية ثقيلة 7/8-9 × 4" | صناعة أمريكية | فولاذ A307 درجة B مطلي بالزنك | سنون جزئية (45 / عبوة)

Used these for a heavy equipment repair last week—the zinc plating held up well even with some rain exposure. The threads engaged cleanly on the first pass, and the partial threading gave me just the right grip depth for the joint.

Finally, a bolt that threads smooth right out of the box without fighting the plating. The zinc finish on these looks uniform and hasn't flaked during tightening, which is a nice change. Perfect for my shop jig builds.

I needed some heavy-duty bolts for a machinery repair and the partial threading on these A307 Grade B steel ones made alignment much easier. The zinc coating looks consistent and should hold up fine in my shop.