Industrial pulley 120 mm, 4 grooves, section B

EMMAR POLEA 120 4B belongs to pulleys, part of our Power transmission range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for POLEA 120 4B and any equivalents.

The EMMAR 120 4B is a V-belt pulley built for drives that use profile B belts. It measures 120 mm in diameter and carries four grooves, so several belts can share the load. This makes it a common choice for agricultural equipment, production lines, exhaust fans and similar drive systems where a compact multi-groove pulley is required. Because EMMAR manufactures these pulleys, machining variants within the same section can be discussed.

Reading the code is straightforward. The number 120 gives the diameter in millimeters, the 4 tells you how many grooves the pulley has, and the B identifies the belt profile it takes. Section B is a classic V-belt profile found in many industrial drives. With four grooves, the drive can use multiple belts, which spreads the load and provides some backup if one belt fails. The pulley is made of cast iron or machined steel depending on the batch, and it is balanced for the speeds typical of these systems.

You will find this type of pulley in the power drives of agricultural machinery, seeders, exhaust fans, compressors, centrifugal pumps and conveyor lines. It also appears in factory equipment and machine tools where the ratio between a motor and a driven shaft must be set. In those installations, the pulley mounts on a shaft with a keyway and is secured with a set screw or a taper bushing, depending on the design. When the original equipment uses a 4-groove pulley, a replacement with the same diameter and section keeps the transmission ratio unchanged.

When selecting a pulley like this, confirm the pitch or outside diameter required, the number of grooves, the belt section and the shaft diameter. Also check how it fixes to the shaft: keyway, taper bushing or set screw. Pulley alignment matters for belt life; even a small angular misalignment increases flank wear and can cause the belt to jump. Tension should follow the belt manufacturer's recommendation, neither too loose nor too tight. For high-speed operation, it is wise to verify balance before putting the pulley into service.

If you are looking for an equivalent, the quickest route is to send the complete part number by WhatsApp, together with a photo of the old pulley or a sketch showing shaft and keyway dimensions. It also helps to note the belt section and the number of grooves the equipment uses. With those details, the team can confirm whether an EMMAR-manufactured pulley fits or whether machining one to size is the better option. You do not need the original part number; the main measurements are enough to start the search.

If this 120 4B pulley matches your needs, send the part number POLEA 120 4B via WhatsApp or email to request a quote. You can also ask about other sizes in section B or pulleys with 2, 3 or more grooves. Technical inquiries are handled Monday through Friday, and the company ships throughout the United States and to several Latin American countries. Quotes are prepared according to quantity and any machining you request, so the more detail you provide, the more precise the response will be.