Industrial pulley 120 mm, 4 grooves, section B

EMMAR POLEA 120 4B is a reference of pulleys, within Power transmission. Request a quote for POLEA 120 4B via WhatsApp or email with the quantity you need; we respond promptly with the quote 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. As it is in-house manufactured, you can inquire about machining variants and sizes within the same section.

This item is a pulley with a 120 mm diameter, 4 grooves and section B. The designation POLEA 120 4B summarizes those three variables: the outside diameter, the number of grooves and the belt profile it accepts. Section B corresponds to classic V-belts with profile B, widely used in industrial drives. Multiple grooves allow the load to be distributed across several belts, which gives more transmission capacity and some 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.

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 transmission 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 fixed 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 transmission ratio.

To correctly select a pulley of this type, take into account the pitch or outside diameter the equipment needs, the number of grooves, the belt section and the shaft diameter. Also check the type of fixing: 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 should be the one recommended by the belt manufacturer, neither loose nor excessive. If the pulley runs at high revolutions, it is advisable to check the balance before putting it into service.

If you need an equivalent pulley, the most practical thing is to send us the full part number via WhatsApp, along with a photo of the old pulley or a sketch with the shaft and keyway measurements. 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 if there is an in-house manufactured pulley that fits or if it is better to machine one to measure. You don't need to have the original part number: the main measurements are enough to guide the search.

If this 120 4B pulley looks like the one you need, send the part number POLEA 120 4B via WhatsApp to MR Accesorios Industriales and we'll 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.