A primary jaw crusher is a type of heavy-duty machinery used in the mining, construction, and aggregate industries to break down large rocks, stones, or ores into smaller, more manageable pieces. It is typically the first stage in the crushing process and is designed to handle the largest and hardest materials. The crusher consists of two jaws—one fixed and one movable—that create a V-shaped cavity. The material is fed into the top of the crusher and is crushed as the movable jaw exerts force against the fixed jaw, breaking the material into smaller pieces. Primary jaw crushers are essential for reducing the size of raw materials for further processing in secondary crushers or for direct use in construction projects.