Here is a table for the grades of steel used in the motor shafts of Parker Servo Motors.
Motor series | Shaft alloy grade |
N, J | 1144 carbon steel |
SM, BE | 303 stainless steel |
SMN, M | 39NiCrMo3 |
MPM | 416 stainless steel |
MPP | 416 stainless steel |
MPW | 316 stainless steel |