Example MSST, and DET. (1)The material of the shaft is AISI 1040 CD steel. F=900 N Determine if OC Shaft is safe (2) If the material is changed to ASTM 30, determine if the shaft remains safe. 50 mm 38 mm 300 mm 38 D mm 5 mm R. 50 25 b. 380 mm 38 D.