Our Part# SM4433 OEM# SM21654 or 21654
Key for 1st reduction shaft
This part can be used on the following model(s):
Nautilus - SC916_Stepper
Stairmaster - 4200PT
Stairmaster - 4400CL
Stairmaster - 4400PT
Stairmaster - 4600CL
Stairmaster - 4600PT
Stairmaster - SC916_Stepper
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