The Square Keystock (3/8") is a precision-machined steel bar designed to lock gears, pulleys, sprockets, and couplings to rotating shafts in mechanical power transmission systems. Installed in matching keyways on both the shaft and the hub, the keystock prevents rotational slippage and ensures torque is transferred efficiently between components. With a 3/8" square profile, it fits standard keyway dimensions used in many industrial, agricultural, and mechanical assemblies. It’s a simple piece of steel doing a very important job—because when shafts start spinning, everything attached to them needs to spin right along with them.
Country of Origin
Varies by production batch
Key Features / Specifications
Ideal For