SFWS16 NB Stainless Steel Shaft:NB Linear Systems 9 1/4" Inch (235mm) Length 1" inch Diameter Shaft SFWS16 NB Stainless Steel Shaft, 1" Diameter x 9 1/4" 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.