What Equipment Is Required to Produce 13 Stone (16–31.5 mm Aggregate)?

　　In the construction and infrastructure sectors, "13 stone" is a standard term for crushed aggregate with a particle size range of 16 to 31.5 millimeters. This size fraction is widely used in concrete batching plants, highway base layers, and railway ballast applications. Producing this specific grade of material requires a well-designed crushing and screening line.

　　The essential equipment falls into two main categories: size reduction machinery and classification systems. Crushers break down raw quarry boulders, while vibrating screens separate the crushed output into precise fractions to ensure the final product stays within the 16–31.5 mm specification.

For processing 13 stone, the recommended crusher lineup typically includes:

　　Jaw Crusher – Handles primary crushing of large feed material (up to 600 mm or more), reducing it to a manageable size for downstream processing.

　　Impact Crusher – Performs secondary and tertiary crushing, delivering excellent cubical particle shape, which is critical for concrete aggregate quality.

　　Cone Crusher – An alternative for fine crushing, particularly when processing hard or abrasive rocks like granite or basalt.

A proven configuration for 16–31.5 mm aggregate production is:

　　1.Jaw crusher for coarse reduction,

　　2.Impact crusher (or cone crusher, depending on rock hardness) for medium and fine crushing,

　　3.Multi-deck vibrating screen to accurately separate the 16–31.5 mm fraction from oversize and undersize materials.

　　This combination not only ensures the target 16–31.5 mm particle size but also maximizes production efficiency and minimizes recirculating loads; however, it is important to note that equipment performance varies significantly across manufacturers in terms of build quality, wear part longevity, and after-sales support, so when selecting your crushers and screens, you should carefully evaluate factors such as feed material hardness, required throughput (tons per hour), moisture content, and site layout—ultimately, a solution tailored to your specific operating conditions will always deliver better results than a generic, one-size-fits-all configuration.