... strictly from API specification and SY/5146 standard.1.Size:,3 1/2", 4",4 1/2", 5", 5 1/2",6 5/8"2 ... bar, fully heat treated, all physical properties conform to API Spec 7 latest edition.The integral HWDP can easily solve ... hardbanding is completely flush on both tool joints and 1/8" oversize on the central upset (fully flush on request ... and extend using time. heavy weight drill pipe(integral,6-5/8")