Square section grips into the part being fixed (typically wood)
Carriage bolts are threaded all the way down to the square section beneath the head
Prevents the bolt from turning when the nut is tightened
18-8 Stainless steel is corrosion and rust resistant
18-8 Stainless steel is considered the fastener industry standard
1/4"-20 Carriage bolts have a domed or countersunk head, and the shank is topped by a short square section under the head.

All Carriage Bolts over 6" in length are Partially Threaded

Diameter x Thread Pitch x Length from Under Head
FT: Fully Threaded
PT: Partially Threaded

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