Double sprocket with hub, pitch 1/2", 21 teeth

MR Piñón doble 1/2" Z21 is a sprockets and gears reference, within Power transmission. Request a quote for Piñón doble 1/2" Z21 via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

The double sprocket 1/2" Z21 is a chain drive chain wheel, with two chain rings and a central hub, supplied by MR in SAE 1045 steel. It is used to drive two chain lines from a single shaft, with a 1/2" pitch and 21 teeth per chain ring. It is a part designed for equipment where space is limited and motion must be transmitted to two mechanisms in parallel, such as conveyors, elevators or agricultural machinery.

This item is a double sprocket with hub, 1/2" pitch and 21 teeth (z=21), machined in SAE 1045 steel. The designation Double sprocket 1/2" Z21 indicates that it is a part with two chain rings integral to a central hub, which mounts on a shaft and allows driving two chains of the same pitch. SAE 1045 steel is a medium-carbon material, suitable for machining and subsequent heat treatment according to the equipment's requirements. The hub makes mounting and securing on the shaft easier, with keyway or set screw options depending on the case.

Typical applications of a double sprocket of this type appear in chain drives where motion must be synchronized or distributed between two branches. It is found in belt or roller conveyors, bucket elevators, agricultural machinery, packaging equipment and production lines with two parallel chains. It is also used as an idler or drive wheel in compact mechanisms, where a single part handles two transmissions and simplifies the shaft design.

To select and mount this sprocket, take into account the chain pitch, the number of teeth, the shaft diameter and the mounting system. The 1/2" pitch must match the chain to be used; the 21 teeth define the transmission ratio together with the driven sprocket. Verify the alignment of both chain rings with their respective chains and the parallelism between shafts. The hub must seat correctly on the shaft and be secured without axial play. If the equipment works with variable loads, check the lubrication and tension of each branch separately.

If you need a sprocket with a different number of teeth, another pitch or a modification to the hub, a nearby size or a custom development can be evaluated. To request an equivalent, send us the part number MR-PINON-DOBLE-1-2-Z21 or the data of the original sprocket: pitch, number of teeth, shaft diameter, mounting type and number of chain rings. With that information it is compared against the alternatives supplied by MR and the most suitable option is determined.

MR Accesorios Industriales supplies this double sprocket in SAE 1045 steel and provides it together with chains, pulleys and other power transmission components. If you want to request a quote or ask about a variant, write to us on WhatsApp with the product part number and we will reply with the technical information and the corresponding quote.