The PJ ribbed belt

The PJ ribbed belt (PJ Belt) is a high-efficiency power transmission belt designed with multiple longitudinal ribs that provide excellent pulley grip, minimize slippage, and ensure smooth, stable operation. Made from high-quality synthetic rubber combined with Polyester or Kevlar tension cords, the PJ belt offers exceptional durability, anti-stretch properties, and strong wear resistance, making it ideal for high-speed transmission systems.

This belt type is widely used in CNC machines, industrial washing machines, 3D printers, compressors, automation equipment, and other precision machinery. Belota supplies genuine PJ belts in a wide range of sizes and brands to meet every technical requirement.

Introduction to PJ Ribbed Belts

PJ ribbed belts—also known as multi-ribbed V-belts—feature a unique hybrid design that combines the characteristics of flat belts and V-rib belts. One side of the belt is smooth, while the other has multiple longitudinal ribs that enhance friction and grip on the pulley.

These belts are commonly used in precision industrial drive systems, mechanical equipment, 3D printers, industrial laundry machines, air compressors, CNC machinery, and more.

Construction & Technical Specifications

Standard specifications:

• Pitch (P): 2.34 mm

• Total height (H): 3.4 – 3.5 mm

• Rib height (H1): 1.4 mm

• Operating speed: up to 50–60 m/s

• High load capacity, long service life, smooth and quiet transmission

PJ belts are produced from synthetic rubber (CR, EPDM, or polyurethane) reinforced with Polyester or Kevlar cords, ensuring high tensile strength, excellent flexibility, and outstanding anti-wear performance.

How to Read PJ Belt Codes

A typical code such as 320J5 is interpreted as:

• 320 → Belt length (inch × 10) → 32 inches

• J → PJ type (2.34 mm pitch)

• 5 → Number of ribs

Example: 10PJ1500 means the belt has 10 ribs, PJ type, and length 1500 mm.

Advantages of PJ Ribbed Belts

• High transmission efficiency and stable precision

• Reduced slippage, smooth and quiet operation

• High load resistance and excellent durability

• Easy installation and replacement

• Suitable for compact drive systems

Industrial Applications of PJ Belts

• Mechanical engineering: CNC machines, lathes, cutting machines

• Electronics: printers, measuring devices, automation systems

• Textile industry: sewing machines, winding machines, yarn feeders

• Household & industrial appliances: industrial washers, dryers, industrial fans, compressors

• Precision equipment: 3D printers, robotic systems

Common PJ Belt Sizes

Popular PJ Belt Brands in Vietnam

• Megadyne (Italy) – Isoran, Polyflex, Silver series

• Optibelt (Germany) – PJ Series

• Bando (Japan) – PJ, PK, PL belts

• Gates (USA) – Micro-V P series

• Mitsuboshi (Japan) – Ribstar PJ

• Contitech (Germany) – Power Transmission series

These brands provide full ranges of pitch sizes and lengths suitable for most industrial equipment in Vietnam.

FAQ

1. Can PJ belts be used in harsh environments?

Yes. They are designed for high load, high heat, and dusty environments.

2. How should PJ belts be maintained?

Check tension, pulleys, and wear conditions regularly. PJ belts maintain tension well and deform less over time.

3. Can PJ belts replace traditional V-belts?

Yes, if the pulley and power requirements match. PJ belts offer higher efficiency and quieter operation.

Buy Genuine PJ Belts in Vietnam

Belota specializes in genuine industrial power transmission belts—timing belts, PJ ribbed belts, PK, PL, PH belts, and more.

We provide:

• Technical consultation & on-site evaluation

• Custom-sized belts

• Optimized transmission solutions for factories and production lines

Contact Belota now for pricing and free technical support on all PJ belt models.