Industrial pulley 120 mm, 4 grooves, section B

EMMAR POLEA 120 4B is a pulleys reference, within Power transmission. Request a quote for POLEA 120 4B via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

The 120 4B pulley is a V-belt drive pulley, manufactured by EMMAR Accesorios Industriales. It has a 120 mm diameter, 4 grooves and section B, which makes it suitable for transmitting power in equipment that runs with profile B belts. It is used in agricultural machinery, production lines, exhaust fans and drive systems where a compact, multi-groove pulley is needed. Being in-house manufactured, you can inquire about machining and size variants within the same section.

This item is a pulley with a 120 mm diameter, 4 grooves and section B. The POLEA 120 4B designation summarizes those three variables: the outside diameter, the number of grooves and the belt profile it accepts. Section B corresponds to classic profile B V-belts, widely used in industrial drives. Multiple grooves allow the load to be distributed among several belts, which gives more transmission capacity and a certain redundancy if one belt fails. It is a cast iron or machined steel part, depending on the batch, and is balanced to rotate at the usual speeds of these systems.

The typical applications of a 4-groove section B pulley appear in power drives of agricultural machinery, seeders, exhaust fans, compressors, centrifugal pumps and conveyor lines. It is also used in factory equipment and machine tools where the drive ratio between an electric motor and a driven shaft needs to be varied. In all those cases, the pulley is mounted on a shaft with a keyway and fastened with a set screw or with a taper bushing, depending on the equipment design. If the original equipment comes with a 4-groove pulley, replacing it with another of the same diameter and section maintains the drive ratio.

To correctly select a pulley of this type, take into account the pitch or outside diameter that the equipment needs, the number of grooves, the belt section and the shaft diameter. Also verify the type of fastening: keyway, taper bushing or set screw. Alignment between pulleys is key for belts to last: a misalignment of a few degrees accelerates flank wear and can make the belt jump. Tension must be the one recommended by the belt manufacturer, neither loose nor excessive. If the pulley runs at high revolutions, balancing should be checked before putting it into service.

If you need an equivalent pulley or a nearby size, the most practical thing is to send us the complete part number by WhatsApp, along with a photo of the old pulley or a sketch with the shaft and keyway dimensions. It also helps to indicate the belt section and the number of grooves the equipment uses. With that data, at MR Accesorios Industriales we can confirm whether there is an in-house manufactured pulley that fits or whether it is better to machine one to measure. You do not need to have the original part number: the main dimensions are enough to guide the search.

If this 120 4B pulley looks like the one you need, send the POLEA 120 4B part number by WhatsApp to MR Accesorios Industriales and we will quote you. You can also inquire about other sizes in the same section B or about pulleys with 2, 3 or more grooves. We handle technical inquiries Monday through Friday and ship throughout the country. Remember that the quote is put together according to the quantity and the machining you request, so the more detail you give us, the better we can respond.