SFWS12 NB Stainless Steel Shaft:NB Linear Systems 25" Inch (635mm) Length 3/4" inch Diameter Shaft SFWS12 NB Stainless Steel Shaft, 3/4" Diameter x 25" 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 single end threaded.