SFWS20 NB Stainless Steel Shaft:NB Linear Systems 13 1/2" Inch (342.9mm) Length 1 1/4" inch Diameter Shaft SFWS20 NB Stainless Steel Shaft, 1 1/4" Diameter x 13 1/2" 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.