The laboratory Jaw Crusher is designed for fast crushing of aggregates, ores, minerals, coal, coke, chemicals and other similar materials. It is compact and of rugged construction for general or small pilot plant operations. Two jaws of manganese steel are provided in this laboratory Jaw Crusher. The moveable jaw produces tow blows for every revolution, thus reducing over sizing to a minimum. A combination of forward and downward strokes with a rocking action exerts pressure on the coarser material, yet permits the finished the jaws. A hopper is provided at the top for feeding material. The smooth jaws ensure a uniform product and easy cleaning is possible.