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Help Needed to identifi this key from elec motor 8mm to 5mm

Help Needed to identifi this key from elec motor 8mm to 5mm

Help Needed to identifi this key from elec motor 8mm to 5mm

(OP)
Hello hope someone can help, I need to replace a key in a electric motor. the key has two different sizes. it is 8mm at the bottom then steps down too 5mm at the top. it connects the motor to a drive gearbox that turns a wheel.

RE: Help Needed to identifi this key from elec motor 8mm to 5mm

the key seat (keyway) widths in the shaft and driven hub should be within ~ 0.001" ( .025 um ) of key.
Is there a setscrew or some other feature that locks the hub to the shaft?

the tapered/rounded flanks of the narrow portion of the key are 'interesting."

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