EN
| Place of Origin: | Tianjin |
| Brand Name: | KDI |
| Model Number: | PJ, PK, PL, PM, PH |
| Certification: | CE/ISO9001:2015 |
| Minimum Order Quantity: | 10pcs |
| Packaging Details: | Carton box/Wooden box |
| Delivery Time: | 15days |
| Payment Terms: | TT |
Maximize power transmission efficiency in compact drives with our multi-ribbed belts, also known as ribbed belts, poly-V belts, or serpentine belts. Engineered for high-speed, high-power-density applications where conventional V-belts or timing belts are too wide or bulky, these belts feature multiple longitudinal ribs on the underside that mate with matching grooved pulleys. Ideal for automotive serpentine drives, washing machines, power tools, HVAC equipment, medical devices, and fitness equipment, our multi-ribbed belts deliver smooth operation, reduced vibration, and extended service life while operating on small-diameter pulses and serpentine drive paths.
High Power Density in Compact Footprint: The multiple-rib design distributes load across several contact points, delivering up to three times the power transmission capacity of standard V-belts within the same width. This allows engineers to design narrower drives, reduce pulley diameters, and save valuable machine space without sacrificing torque delivery.
Exceptional Flexibility for Serpentine Drives: The thin cross-section and longitudinal rib geometry enable operation on extremely small pulley diameters (as low as 10-15mm) and reverse bends without cracking or overheating. This makes ribbed belts the preferred choice for serpentine drives that wrap around multiple pulleys on both front and back surfaces.
Quiet, Vibration-Free Operation: Precision-molded ribs ensure uniform contact with pulley grooves, eliminating the stick-slip vibration common in traditional V-belt drives. The result is smoother power delivery, reduced audible noise, and less mechanical stress on bearings and driven components.
Oil, Heat & Wear-Resistant Compounds: Manufactured from specially formulated EPDM, CR (neoprene), or HNBR rubber compounds, our ribbed belts resist degradation from oil, grease, ozone, and elevated temperatures. Reinforced with polyester or aramid tensile cords for minimal stretch and maximum fatigue life under cyclic loading.
Versatile Profile Compatibility: Available in all standard profiles including PJ (0.050″ pitch), PL (0.075″ pitch), PK (0.100″ pitch), PM (0.150″ pitch), and PH (0.200″ pitch), ensuring direct interchangeability with all major drive systems (Automotive: PK4-PK18; Industrial: PJ, PL, PM).
| Material: | EPDM rubber / CR (Neoprene) / HNBR (high-temp/oil resistant) |
| Tensile Member: | Polyester cord / Aramid cord (Kevlar) |
| Profiles: | PJ, PK, PL, PM, PH (J-section to H-section) |
| Rib Count: | 3 to 50 ribs (PK4, PK6, PK8, PK10, PK12, PK14, PK16, PK18, etc.) |
| Rib Pitch: | 2.34mm (PJ), 3.56mm (PL), 4.70mm (PK), 6.40mm (PM), 9.40mm (PH) |
| Top Surface: | Fabric-backed or bare rubber |
| Operating Temperature: | EPDM: -40°C to +120°C; HNBR: -30°C to +150°C |
| Static Conductivity: | Antistatic (ISO 1813 compliant) |
| Standards: | RMA IP-26, DIN 7867, ISO 9982 (automotive), ISO 9981 (industrial) |
Our multi-ribbed belts are manufactured under ISO9001:2015 certified processes in state-of-the-art facilities. Materials are RoHS and REACH compliant. For automotive applications, belts meet or exceed SAE J1459 and ISO 9982 performance requirements. Industrial profiles conform to ISO 9981. We provide tensile test reports, elongation certificates, and oil/heat resistance documentation upon request. For food processing equipment, FDA-compliant belts are available with non-marking fabric backing.
| Rib Profile Accuracy: | Molded within ±0.02mm rib-to-rib spacing, ensuring consistent engagement and eliminating localized wear or noise. |
| Tensile Strength: | Varies by cross-section and cord material. PK section (polyester): 150-300 N per rib; PK section (aramid): 250-500 N per rib. |
| Elongation at 100N/rib: | <0.3% for aramid cord; <0.5% for polyester cord – minimal stretch reduces maintenance. |
| Hardness (Shore A): | 75-80 for optimal flexibility and wear balance. |
| Backside Flexibility: | Allows reverse bends on idlers down to 1.5× belt thickness without cracking. |
| Dynamic Fatigue Life: | Exceeds 200 hours on automotive durability cycle (SAE J1459). |
| Operating Temperature Range: | Standard EPDM: -40°C to +120°C; HNBR (high-performance): -30°C to +150°C for under-hood or high-heat industrial applications. |
| Custom Specifications: | Special rib spacing, non-standard widths, color coding (blue, green, yellow), and custom tensile cord materials. |
Reference Chart (PK Section):
PK4 · 5.1mm width · ~0.23 kg/m
PK8 · 9.4mm width · ~0.45 kg/m
PK10 · 11.5mm width · ~0.56 kg/m
PK12 · 13.8mm width · ~0.67 kg/m
PK16 · 18.2mm width · ~0.90 kg/m
We offer a comprehensive 12-month warranty against manufacturing defects, including rib separation, tensile cord failure, or premature cracking under normal operating conditions. Our technical support team provides expert assistance with profile selection, pulley groove inspection, and tensioning recommendations to optimize drive performance. For volume and OEM customers, we provide pre-production samples for validation and can manufacture custom rib counts, lengths, or color-coded belts with short lead times. We maintain stock of PK, PJ, and PL profiles in popular rib counts for rapid dispatch. For any performance issues, our clear return and replacement policy ensures minimal production disruption. We also offer custom endless molding and joining services for specialized lengths.
