SFWS12 NB Stainless Steel Shaft:NB Linear Systems 6" Inch (152.4mm) Length 3/4" inch Diameter Shaft SFWS12 NB Stainless Steel Shaft, 3/4" Diameter x 6" inch Long Shaft, the shaft is made of stainless steel, the shaft is 440C Stainless Steel, it is Case hardness is Rockwell 52-C56,, the shaft is both end threaded.