5/16-18 X 3/4" 馬車螺栓 | 全螺紋 | A307 Grade A 鍍鋅鋼 (375 個/包)

The square neck under the head grabbed the wood immediately, so I didn't have to wrestle a wrench to keep them from spinning. For 375 pieces at this price, the zinc coating looks even and clean across the whole batch.

Used these to secure some pergola brackets to a treated lumber beam; the square neck grabbed perfectly and kept them from spinning while I tightened everything down. The zinc plating gives them a nice, clean finish that should hold up well outdoors.

Installed a bunch of these on a wooden gate yesterday and that square neck under the head really locks them in place—no spinning while tightening. The zinc coating is consistent and smooth, and the whole pack had clean threads.