... 11B:CLASST AND CLASS SM TYPE T SUCKER ROD COUPLING BLANKS,OF COLD DRAWN SEAMLESS MECHANICAL STEEL TUBING,ARE FORMED TO ... MATERIAL HARDNESS OF 56 TO 62 HRA AND MAGNETICALLY INSPECTED.BLANKS ARE MACHINED TO COUPLING SIZE AND TOLERANCES,THREADEDE BY COLD ... PROCEDURE.SPRAYLOY COUPLINGS ARE MANUFACTURED IN THEIR OWN DEDICATED LINE.BLANKS ARE CLEANED, PREPARED, LOADED ON MANDRELS, SHOT BLASTED, FLAME SPRAYED ...