مسامير عربة 5/16-18 × 5-1/2 بوصة | ملولبة بالكامل | فولاذ عادي A307 درجة A (250 / عبوة)

I needed carriage bolts for a trailer hitch build, and these fully threaded 5/16-18 x 5-1/2" ones were just long enough to get through the frame without being too short. The square neck locked into the metal perfectly, saving me from needing a wrench on the head.

The square neck under the head grabbed the wood immediately, so I didn't have to hold a wrench on the other side while tightening. They're fully threaded, which made cutting a few down to odd lengths for a custom shelf bracket pretty painless.

Used a dozen of these to rebuild a wooden gate and the fully threaded design made installation a breeze. The square neck really does pull the bolt tight without spinning.