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Key and keyway dimensions

The key and keyway dimensions for servomotors vary depending on the motor manufacturer and specific model. However, most motors have standardised dimensions for their keys and keyways. For example, the standard keyway size for a 3/8″ shaft is typically 3/32″ x 3/64″, while for a 1/2″ shaft, it is usually 1/8″ x 1/16″. The key dimensions typically match the keyway size and can range from 1/8″ x 3/32″ to 1/4″ x 1/8″.

It is important to ensure that the key and keyway dimensions match the motor and shaft sizes to ensure proper installation and operation. Additionally, it is recommended to use high-quality materials for the keys and keyways to prevent wear and ensure long-term durability.

Below is a reference on shaft diameters and the corresponding keys / keyways according to the prevailing standards.

The table, to the best of our knowledge, complies with:

DIN6885 Pt.1
ISO R 773 and
BS4235 Pt.1

Motor Technology will not accept any liability for the accuracy of the data supplied. This information is meant as a guideline only.