The Machine Key M20 x 12 x 40 Form B from G L Huyett is a precision-engineered component designed for secure shaft and hub connections. Made from durable carbon steel, this undersized key measures 20mm in width, 12mm in height, and 40mm in length, ensuring a perfect fit for various machinery applications. Its Form B design allows for easy installation and reliable performance under load. This machine key is essential for maintaining the integrity of rotating equipment, meeting industry standards for quality and durability.