Form B Machine Keys

Form B Machine Keys

Form B machine keys, also known as straight keys, have two square ends and feature straight, 90° parallel sides. These keys provide the most surface contact with both the key seat and the hub of a sprocket, gear, pulley, or cog. Machine keys are removable machine elements installed between shaft key seats and hub key ways to transmit torque in power transmission assemblies. Form B keys can be machined; finished in a variety of shapes, sizes, and materials; and tumbled for automated assembly lines or just about any application.