The PH ribbed belt (also known as Poly-V PH or multi-rib PH belt) is a compact, high-performance drive belt designed for applications that require smooth transmission, high speed, and excellent precision. This belt combines the flexibility of a flat belt with the strong grip of a V-ribbed belt, enabling stable operation in tight spaces and light-load systems.

Structure & Key Technical Characteristics

A PH ribbed belt features multiple small ribs running longitudinally along the belt. These ribs are made from high-quality synthetic rubber or polyurethane (PU) for superior abrasion resistance, reinforced with polyester or aramid cords for stability, durability, and minimal stretch.

Belt Type Pitch P (mm) Total Thickness H (mm) Rib Height h (mm) Max Speed (m/s)
PH Ribbed Belt 1.6 2.5 0.8 60

Key Highlights

  • Fine pitch of 1.6 mm enables smooth, low-vibration transmission

  • Operating speed up to 60 m/s, ideal for high-speed mechanisms

  • Highly durable, low-stretch, excellent wear resistance

  • Quiet and stable operation — perfect for noise-sensitive environments

How to Read PH Ribbed Belt Codes

Similar to other Poly-V belts, PH belts have printed codes indicating their specifications.

Format: Number of ribs + Type + Length

Example: 4PH300

  • 4 → Number of ribs

  • PH → Belt type (1.6 mm pitch)

  • 300 → Belt length (mm or inch, depending on manufacturer)

If markings fade over time, you can identify the correct belt by:

  • Measuring the pitch to determine type (PH, PJ, PK, PL, PM)

  • Counting the ribs

  • Measuring the total belt length

Comparison of PH With Other Ribbed Belts

Belt Type Pitch (mm) Common Applications
PH 1.6 Small devices, mini motors, printers, electronics
PJ 2.34 Light industrial machines, small air compressors
PK 3.56 Automobiles, air conditioners, household appliances
PL 4.7 Heavy-duty industrial machinery
PM 9.4 High-power transmission systems

PH is the smallest and most lightweight type, ideal for compact and electronic devices.

PH Belt Size Chart

Belt Code Length (mm) Belt Code Length (mm)
PH600 600 PH1090 1090
PH690 690 PH1095 1095
PH760 760 PH1160 1160
PH810 810 PH1220 1220
PH850 850 PH1230 1230
PH865 865 PH1240 1240
PH880 880 PH1260 1260
PH955 955 PH1270 1270
PH965 965 PH1285 1285
PH975 975 PH1300 1300
PH990 990 PH1305 1305
PH1010 1010 PH1320 1320
PH1080 1080 PH1475 1475
    PH1600 1600

Industrial Applications of PH Ribbed Belts

PH belts are widely used in compact, high-precision machinery, including:

  • Printers, copiers, scanners

  • Electronic devices, mini fans, small motors

  • Treadmills and home fitness equipment

  • Sewing machines, measuring instruments, medical devices

  • Small mechanical tools and compact industrial equipment

Thanks to smooth, stable operation, PH belts extend equipment lifespan, reduce pulley wear, and improve energy efficiency.

Popular PH Belt Brands

In Vietnam, common PH belt brands include:

  • Bando

  • Optibelt

  • Mitsuboshi

  • Gates

  • Continental

  • Steigentech

  • Megadyne

All of these meet ISO – DIN – RMA standards for durability, precision, and load capacity.

Why Choose PH Ribbed Belts From Belota

The PH ribbed belt is a compact, reliable, and highly efficient drive solution for light industrial and electronic equipment. With smooth operation, long service life, and low maintenance cost, it is the ideal choice for high-precision systems.

BELOTA specializes in consulting, supplying, and installing PH, PJ, PK, PL, and PM ribbed belts for various industries across Vietnam.

Contact Belota today for expert support and the right belt for your application.