1/2-13 X 18" 馬車螺栓 | A307 Grade A 普通鋼 (50個/包)

The square neck grabs tight on the first sink, no spinning or cursing even when I was wrenching them into green oak. Eighteen inches gives plenty of bite for a 6x6 post, and at fifty per box I’ve got spares for the next fence section.

The square neck on these bolts really grabbed into the treated lumber and held tight without spinning at all. I just finished a heavy pergola with them.

Used three of these on a timber frame gate yesterday and the 18" length gave me plenty of thread for a double nut setup. The square neck seated flush without any spinning, which is exactly what you want when you're working alone. Bag of fifty means I won't need to reorder for a while.