The Emhart is a pin-tumbler lock that uses six pin stacks. The driver pins of the Emhart have a T shaped protrusion, with a matching gap on the top of the key pins. These two points interlock, requiring that pins move together until they are disconnected. When pin stacks are properly raised and rotated, movement of the plug causes the pin stacks to disconnect, trapping each driver pin above the shear line. Driver pins maintain their position by being trapped in grooves around the plug. These grooves double as protection against various forms of destructive entry, as well. The key contains cuts that mirror the grooves in the plug, allowing the plug to rotate completely while keeping the driver pins in the proper position.
The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide axial rotation which is necessary to properly rotate the pin stacks.
The Emhart uses a variable MACS based on the angle of rotation between pins. Adjacent pins with the same angles use a MACS of 4, adjacent pins with different angles use a MACS of 3.[2]
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