Serpentine Belts

In olden days the engines used to be equipped with multiple Belts, performing varied functions. However, modern vehicles are designed to function fully using just a single V-Belt. It is mostly the Poly-V Belt or also known as Serpentine Belts, which is used to power the alternator, power steering, air-conditioning, and all other accessories.

The Serpentine Belts is either a V-Belt of a flat ribbed belt. The advancement in the technology and the rubber compounding has made the Serpentine Belts as the most reliable, single element to drive all the accessories associated with the engine.

The Serpentine Belts may solely operate the alternator or it may also drive other components such as water pump, air compressor, air conditioning compressor and power steering pump etc.

Automotive Poly-V Belts

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  • Special EPDM high compression compound for enhanced dimensional stability, minimal vibrations and reduced noise levels
  • Enhanced performance in extreme temperature conditions because of special thermal resistance compound, where the temperature ranges from -35°C to +130°C
  • Special fibre-loaded compound offers enhanced product life
  • High power-rated Belts for improved performance over higher load and speed conditions
  • Oil and heat resistant, suitable for HEMM applications
  • Superior ozone, steam, water and acid resistance to minimize early ageing and crack formation

Constructional Details

  1. Specially designed top fabric for enhanced lateral stiffness and flexibility, protects the Belt from oil, grease or dust
  2. Specially treated EPDM polyester tension member for high tensile strength with negligible elongation
  3. Fiber Loaded EPDM compression rubber for high thermal resistance to maintain the profile dimension for longer service life.

Constructional Details


Intermediate sizes are available upon request

Reference Standard

ISO 9981, RMA IP 26, JASO E-109


Automotive engines, Alternators, Compressors, Water pumps, Fans, Power steering pumps, etc.

Product Range

Section Thickness (mm) Rib Pitch (mm) Min. Pulley Dia. (mm) No. of Possible Ribs Manufacturing Range Length Designation
Min. (mm) Max. (mm)
PK 4.5 3.56 45 2 to 150* 280 5000 Le
DPK 7.0 3.56 50 2 to 13 1195 3255 Le


* Belts are available in Moulded type: PK-710, 720, 730, 740, PK-750, 770, 800, 875, 930, 1035, 1040, 1045,1094, 1115, 1170, 1200, 1220, 1240, 1250, 1323, 1363, 1370, 1385, 1397, 1422, 1435, 1515, 1570, 1585, 1665, 1705, 1820, 1835, 1866, 2245

Product Label

FAQ - Serpentine Belts

What is a Serpentine Belt?

A Serpentine Belt, also known as a multi-ribbed belt or a drive belt, is a single, continuous belt that winds through various pulleys in an engine to power multiple components simultaneously.

What does a Serpentine Belt do?

It drives essential engine components such as the alternator, power steering pump, air conditioning compressor, water pump, and sometimes the cooling fan, providing power to these accessories as the engine runs.

How is a Serpentine Belt different from other Belts?

Unlike older engines that used multiple Belts for different accessories, a Serpentine Belt is a single belt that efficiently powers multiple engine components, saving space and enhancing efficiency.

What materials are Serpentine Belts made from?

They are typically made from durable materials like rubber compounds reinforced with synthetic materials such as polyester or aramid fibers for strength and resistance to wear.

What are signs that a Serpentine Belt needs replacement?

Signs include visible wear, cracking, fraying, loss of tension, squealing noises, or accessories like the alternator not functioning properly.

Can I replace a Serpentine Belt myself?

Replacing a Serpentine Belt requires specific knowledge due to its routing complexity and tensioning requirements. It's advisable to seek assistance from a qualified technician for proper replacement.

How can I maintain a Serpentine Belt for optimal performance?

Regular inspection for wear, proper tension adjustment, alignment checks, and following manufacturer-recommended maintenance schedules are crucial for maximizing belt lifespan and efficiency.

What happens if a Serpentine Belt breaks while driving?

If the belt breaks while the engine is running, it can cause accessories like the alternator or water pump to stop functioning, potentially leading to engine overheating or battery discharge.

Can extreme temperatures affect the performance of a Serpentine Belt?

Extreme heat or cold can impact the belt's performance and lifespan, so regular inspection and adherence to maintenance schedules become even more critical in harsh conditions.