مسامير عربة 1/4-20 × 3-1/2" | ملولبة بالكامل | فولاذ عادي A307 درجة A (625/عبوة)

The square neck under that smooth head locked into the wood perfectly, so I didn't need a wrench to hold them still while tightening. At 3-1/2 inches fully threaded, they grabbed deep into the beam and haven't budged since.

The square neck on these bolts grabbed the wood perfectly, so I didn't need a second wrench to keep them from spinning while tightening. I used about half the box on a deck repair, and every one threaded smoothly without any binding.

Picked up a 625-pack of these 1/4-20 carriage bolts for a deck rebuild, and the fully threaded length made driving them into the wood much easier than partial-thread alternatives. The A307 Grade A steel feels sturdy and cost-effective for outdoor projects.