5/16-18 x 12" 馬車螺栓 | A307 A級鍍鋅鋼 (25 / 包)

The full 12-inch length is exactly what I needed for a thick timber frame project, and the square neck under the head dug right into the wood—no spinning or fussing once the wrench was on. The zinc plating looks clean and hasn’t shown a single speck of rust after a week of rain on the deck.

The square neck under the head locked perfectly into my wooden posts, so the bolt didn’t spin at all while I tightened the nut. These 12-inch lengths were just right for my deck repair, and the zinc coating looks clean without being flashy.

I needed some long carriage bolts for a heavy wooden gate repair, and these 12-inchers went through the beam nicely without spinning. The zinc plating feels durable enough to resist the weather, too.