SFWS8 NB Stainless Steel Shaft:NB Linear Systems 12 5/8" Inch (320.7mm) Length 1/2" inch Diameter Shaft SFWS8 NB Stainless Steel Shaft, 1/2" Diameter x 12 5/8" 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.