These are 3 inch by 3 inch aluminum square tubing boat trailer crossmembers. typically you can mount on these crossmembers using bolts or u bolts.. This square tube v-bend aluminum cross-member is common on aluminum i beam boat trailers. the tube measures 3 inches tall x 3 inches wide x 80 inches long. while this is considered an industry standard 80 inch cross member, it measures 79 1/2" tip to tip.. Boat trailer aluminum cross member 79-1/2" long 3x3 square tube v-curve see more like this 12 items found from ebay international sellers 80 x 40mm crossmember to suit inside width of 1620mm boat trailer.
Aluminum cross member 3/16"x3x3x60" v - xb5192 $ 102.00 aluminum cross member 1/4"x3x3x48" v -xb5190 $ 95.00 aluminum cross member 3/16"x3x3x48" v - xb5185. This is a solid aluminum 80 inch cross member that is used to mount between the main frame of boat trailers. while this is considered an 80 inch cross member, its end to end measurement is 79 1/2 inches.. Trailer parts superstore offers several sizes of galvanized steel trailer tongues designed to be used for boat trailers or any other 'straight tongue' trailer application. we also offer a wide selection of galvanized trailer crossmembers and frame mounting brackets..