SINOCONVE 2PJ 3PJ 4PJ 5PJ Poly V Ribbed Belt for Compact Power Transmission

Narrow PJ Belt Options for Compact Drive Systems

The SINOCONVE 2PJ, 3PJ, 4PJ and 5PJ Poly V belt range provides several narrow rib-count options for compact mechanical power transmission. All four configurations use the same fine-pitch PJ geometry, while the number of working ribs changes according to the required pulley width and drive design.

These smaller rib-count configurations are particularly useful where the transmission system has limited installation width. The relatively thin PJ cross section also allows the belt to bend around smaller pulleys while maintaining multiple parallel contact surfaces with the grooved pulley.

Explore additional profiles and rib-count options in the SINOCONVE Ribbed Belt Range .

2PJ to 5PJ Model Range

PJ Profile Reference Dimensions

Choosing Between 2PJ, 3PJ, 4PJ and 5PJ

The number before PJ identifies the number of longitudinal ribs. It does not describe product quality or belt length. The correct rib count is determined by the pulley and transmission design.

Fine-Pitch Design for Space-Limited Equipment

The PJ profile has a finer rib pitch than larger Poly V profiles such as PK. This allows several working ribs to fit within a relatively narrow belt width and supports flexible movement through compact mechanical layouts.

• Narrow belt configurations: low rib counts are suitable for matching narrow pulley widths.
• Good bending flexibility: the thin PJ section supports smaller pulley diameters.
• Parallel load contact: each rib engages a corresponding pulley groove.
• Compact installation: useful for equipment with restricted internal space.
• Stable running: correct pulley matching and tension support consistent transmission.

Typical Applications for Low-Rib-Count PJ Belts

2PJ through 5PJ belts can be used in light and compact equipment designed for the corresponding PJ profile, belt length and pulley width.

• Household appliances
• Small washing and drying equipment
• Office machinery
• Printers and paper-handling equipment
• Small fans and blowers
• Compact pump drives
• Packaging machinery
• Light mechanical equipment
• Small roller and shaft drives

SINOCONVE also supports transmission belts for printing machinery, pumps, compressors, fans and other general drive equipment. See our Industrial Equipment Belt Solutions for more application information.

Rib Count Does Not Define Effective Length

A designation such as 3PJ only identifies three ribs and the PJ profile. It is not a complete dimensional model because the effective length is still missing.

Complete belt markings normally combine rib count, profile and length. Two 3PJ belts can therefore have the same cross section but fit completely different machines if their effective lengths are different.

How a PJ Belt Is Built

PJ Profile Compared with PK

PJ and PK belts require different pulley groove geometry and should not be treated as interchangeable even when the rib count is the same.

Flexible Supply for Small Belt Specifications

For machinery manufacturers, spare-parts suppliers and belt distributors, 2PJ–5PJ specifications can be reviewed as part of a mixed model order. Buyers can organize requirements by rib number and complete belt length.

• 2PJ / 3PJ / 4PJ / 5PJ options
• Multiple effective lengths
• OEM belt marking
• Private-label printing
• Customized individual packaging
• Mixed-size distributor orders

Learn more about SINOCONVE manufacturing and customization .

Details to Provide for a Quotation

For faster specification confirmation, please send:

1. Complete original belt marking
2. Required model: 2PJ / 3PJ / 4PJ / 5PJ
3. Effective belt length
4. Equipment or machine model
5. Pulley dimensions if available
6. Original part number if available
7. Quantity for each specification
8. Custom marking requirements
9. Packaging requirements

2PJ–5PJ Belt FAQs

What is the difference between 2PJ and 5PJ?

Both use the same PJ profile. The difference is the number of longitudinal ribs: 2PJ has two ribs, while 5PJ has five.

Does 4PJ specify the belt length?

No. 4PJ only identifies four ribs using the PJ profile. The effective length must be specified separately.

Can I cut a wider PJ belt down to fewer ribs?

Rib-count requirements should be confirmed before ordering and production. Finished belt dimensions and quality requirements should match the intended pulley rather than relying on field modification.

Are these belts suitable only for printers?

No. Low-rib-count PJ belts may be used in various compact mechanical systems, household appliances, office equipment, small fans, pumps and other matched drives.

Can different PJ sizes be supplied in one order?

Mixed models can be reviewed according to the complete specification list, quantities, marking and packaging requirements.