These stainless steel carriage bolts have a square neck to help keep the bolt in place during installation. The standard type 18-8 stainless bolts have a completely smooth head (no markings) to give it that nice, finished appearance while the marine grade type 316 option does have 316 stamped on the head. PLEASE NOTE: The 316 stainless carriage bolts are not completely smooth because of the 316 stamp. Length is measured from underneath the head and includes the square neck. 
Please select the size category type below.