Profile: R. Smith and Son, Inc. specializes in providing thread protectors. Our light weight plastic thread protectors offer protection for all casing, tubing and tool joint sizes of pipe. Our entire line of plastic protectors are manufactured to meet or exceed all A.P.I safety standards. Our cast steel protectors provide heavy duty protection as well as use for lifting drill collars and bits. We stock most standard regular, IF, FH, H-90 and left hand cast protectors, as well as blank castings.