Industrial pulley 420 mm, 3 grooves, section B
- Brand
- EMMAR
- Category
- Power transmission
- Subcategory
- Pulleys
- Section
- B
- Series
- Sección B
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Description
EMMAR POLEA 420 3B 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 420 3B and any equivalents.
The EMMAR 420 3B is a V-belt pulley with a 420 mm diameter and three grooves sized for section B belts. It transfers power from a driving shaft to one or more driven shafts, which suits equipment that needs a steady speed ratio and solid drive capacity, such as fans, compressors, pumps and process machinery. Because EMMAR produces this pulley in its own shop, the groove profile and balancing are held to spec, helping the belt sit correctly and wear evenly.
The code POLEA 420 3B tells you the three key variables at a glance: diameter, groove count and belt section. The 420 stands for the diameter in millimeters, the 3 for the number of grooves, and the B for the V-belt section. Each groove is cut to the section B profile so the belt contacts the flanks rather than the bottom. The pulley mounts on the shaft through a central bore, which is machined to match the shaft diameter of your equipment; that dimension is confirmed when you send your inquiry.
A three-groove section B pulley is typically chosen for drives that need more torque than a single-groove unit can deliver. You will find it on centrifugal fans, screw compressors, centrifugal pumps, screens, mixers and transmission lines in process plants. It also works when upgrading existing equipment to handle more power without changing the diameter ratio. In every case, the pulley runs with a matching drive pulley and a set of belts in the same section.
When selecting this pulley, check the pitch diameter, the number of grooves and the belt section. Confirm that the bore diameter fits your shaft and that the keyway is correct. Before mounting, clean the pulley and remove any burrs. Set the tensioner so the belts run at the recommended tension. Misalignment between pulleys speeds up wear on both the belts and the grooves, so use a straightedge or laser to check alignment before start-up.
If you need a different groove count, another diameter or a different section, the pulley can be custom made. To request an equivalent, send the part number POLEA 420 3B or a drawing with the main dimensions: outside diameter, shaft diameter, number of grooves and section. A photo of the original pulley with a ruler next to it also works. With that information, the part is quoted.
MR Industrial Accessories supplies this pulley, manufactured by EMMAR with concentricity and balancing control. If the pulley is part of equipment that is out of service, send the part number by WhatsApp or email and we will reply with a quote. We can also help you choose the right section B belt to complete the assembly.
Dimensions
- Size
- 420mm
- Grooves
- 3
- Section
- B
Frequently asked questions
- What does 420 3B mean on this pulley?
- 420 is the pulley diameter in millimeters, 3 is the number of grooves and B is the V-belt section. So it is a three-groove pulley for section B belts with a 420 mm diameter.
- Can it be manufactured with a different shaft diameter?
- Yes. The central bore and keyway are machined to match your equipment's shaft. When inquiring, provide the shaft diameter and keyway dimensions so the pulley can be custom made.
- How do I request an equivalent pulley?
- Send the part number POLEA 420 3B by WhatsApp or email, or provide the original pulley's data: diameter, number of grooves, section and shaft diameter. With that, an equivalent is quoted.