PK Poly-V Belt 1505-4350mm, 3.56mm Pitch, 5-15PK EPDM, Supplier

📦 Current Stock Availability (Heavy-Duty Series) – Immediate Shipping

Rib counts: 5PK, 6PK, 8PK, 10PK, 12PK, 15PK
Effective length range: 1505 mm – 4350 mm
Ideal for heavy commercial trucks, buses, construction equipment, agricultural machinery, large industrial compressors, mining drives, and heavy HVAC systems.

💡 Looking for smaller sizes for passenger cars or home appliances?

We also stock standard light-duty PK belts (4PK/5PK/6PK/8PK, 520mm-1500mm) on our light-duty PK belt product page.

What Is a Heavy-Duty PK Poly-V Belt?

Heavy-Duty PK V-Ribbed Belt is the high-strength variant of the standard PK Poly-V Belt (multi-rib) belt family, sharing the same 3.56 mm rib pitch but featuring a reinforced rubber body, heavier tensile cords, and optimized construction to handle the high torque, constant shock loads, and high operating temperatures found in heavy commercial vehicle and industrial drive systems.

Engineered for diesel engines 10L and above, high-power industrial drives, and continuous heavy-load operation, Heavy-Duty PK V-Ribbed Belt provides positive non-slip power transmission for multi-accessory serpentine drive systems in applications where standard light-duty PK belts would stretch, crack, or fail prematurely. These belts are fully dimensionally interchangeable with all major global heavy-duty PK belt lines, ensuring universal replacement compatibility for fleet maintenance, industrial repair, and OEM assembly worldwide.

For lighter duty applications including passenger cars, SUVs, home appliances, and light commercial vehicles under 3.5T, please refer to our light-duty PK Poly-V Belt product page covering 4PK to 8PK profiles in 520mm to 1500mm lengths. For positive engagement synchronous drive applications in heavy industrial equipment, browse our full range of V-Belts.

Heavy-Duty EPDM Material & Construction

Every Heavy-Duty PK V-Ribbed Belt is built with a reinforced triple-layer construction optimized for maximum durability, shock resistance, and long service life under continuous heavy load and high temperature conditions:

🔗 Heavy-Grade Tensile Cords

High-modulus polyester cords are standard, with optional aramid (Kevlar) reinforced cords available for extreme shock loads, frequent start/stop cycles, or heavy pulsating loads. Cords are helically wound for zero stretch and consistent tension retention, with 60% higher tensile strength than standard light-duty PK belt cords.

🧱 Premium Heavy-Duty EPDM Body

Heavy-grade EPDM rubber compound forms the main belt body and rib structure, formulated for superior resistance to heat, ozone, oil, diesel soot, and common industrial/automotive chemicals. Standard operating temperature range of -40°C to +120°C.

🛡️ Reinforced Abrasion-Resistant Backing

A thicker, abrasion-resistant fabric layer is bonded to the flat top surface to withstand heavy backside idler loads common in heavy-duty serpentine drive systems, reducing backside wear and extending belt life under high tension.

Custom construction options include static-conductive compounds for mining and explosive atmosphere applications, oil-resistant special compounds for industrial environments, and high-temperature compounds for operating temperatures up to 120°C.

Standard Specifications

Parameter	Standard Value
Profile	Heavy-Duty PK Poly-V Belt (Multi-Rib)
Rib Pitch	3.56 mm
Rib Height	4.8 mm (REF)
Rib Angle	40°
Minimum Recommended Pulley Diameter	25 mm
Maximum Linear Speed	40 m/s
Transmission Efficiency	Up to 98%
Operating Temperature Range	-40°C to +120°C
Available Rib Counts (Current Stock)	5PK / 6PK / 8PK / 10PK / 12PK / 15PK
Available Lengths (Current Stock)	1505 mm – 4350 mm effective length
Tensile Cord Options	High-strength polyester (standard), aramid/Kevlar (optional for shock loads)
Typical Service Life (Heavy Truck)	120,000 – 180,000 km (75,000 – 110,000 miles), service life varies by load, pulley alignment and maintenance.

Cross section diagram of PK Poly-V belt showing 3.56mm rib pitch, rib height and profile dimensions

7 Core Benefits of Heavy-Duty PK Poly-V Belt

1. Handles High Horsepower Heavy-Duty Loads

Reinforced construction and high tensile strength cords allow Heavy-Duty PK V-Ribbed Belt to transmit power for diesel engines 10L and above, large industrial compressors, and heavy machinery drives up to 500 HP, easily handling the high torque loads that cause standard light-duty belts to fail.

2. Superior Shock Load Resistance

Optional aramid tensile cords and reinforced rubber body absorb heavy shock loads from engine compression, equipment start-up, and heavy pulsating loads common in construction equipment, mining machinery, and agricultural applications, preventing cord breakage and premature failure.

3. 98% Transmission Efficiency for Fuel Savings

Multi-rib design provides maximum contact area with pulleys, eliminating slip even under full load and delivering 98%+ power transmission efficiency, reducing fuel consumption in heavy commercial fleets and energy use in industrial drives for significant operating cost savings.

4. 3x Longer Service Life Than Standard V-Belts

Premium heavy-duty EPDM compound resists heat cracking, hardening, ozone damage, and oil degradation far better than neoprene V-belts, delivering 120,000-180,000 km of service life in heavy truck applications — 3 times longer than classical wrapped V-belts, reducing fleet downtime and maintenance costs.

5. Optimized for Serpentine Accessory Drives

Reinforced backing withstands high reverse-bend loads from backside idlers and tensioners, allowing a single belt to drive all engine accessories including alternator, AC compressor, power steering pump, water pump, and fan hub in heavy commercial vehicle engines, simplifying maintenance.

6. Smooth Low-Noise Operation at High RPM

Precision molded rib profile ensures even rib engagement, reducing vibration and drive noise even at high diesel engine RPM, improving driver comfort in commercial vehicles and reducing noise pollution in industrial facility environments.

7. Global Heavy-Duty Standard Interchangeability

Heavy-Duty PK is a globally standardized profile, interchangeable with pulleys and belts from all major manufacturers heavy-duty lines. Fleet mechanics and industrial maintenance teams worldwide use this standard, ensuring easy replacement and universal compatibility.

Available Stock Sizes & Naming Convention

Heavy-Duty PK V-Ribbed Belt follows the same universal naming convention as standard PK belts, with format: [Number of Ribs] PK [Effective Length in mm]

For example, a belt marked 10PK2280 indicates: 10 ribs, heavy-duty PK profile, 2280 mm effective length. Our stock SKUs use the prefix PB-, for example PB-10PK2280.

💡 Naming Tip to Avoid Ordering Errors

Always confirm the rib count and length before ordering — heavy-duty PK belts use the same 3.56 mm pitch as light-duty PK, but differ in cord strength and rubber compound. For sizes shorter than 1505 mm or 4PK profile, use our light-duty PK belt page.

✅ Currently In Stock (Heavy-Duty Series, Immediate Shipping):

Rib counts: 5PK, 6PK, 8PK, 10PK, 12PK, 15PK
Effective length range: 1505 mm – 4350 mm
Suitable for heavy trucks, buses, construction equipment, agricultural machinery, large industrial compressors, mining drives, and heavy HVAC systems.

For reference sizing data, please Download PK Poly-V Belt Size Chart & Dimensional PDF for OEM applications.

🚛 Commercial Vehicles & Mobile Equipment (70%+)

Heavy-Duty PK V-Ribbed Belt is the industry standard for heavy diesel commercial vehicle serpentine drives:

Heavy semi-trucks
Tractor units
Long-haul diesel trucks
Passenger buses
Coach buses
City transit buses
Excavators
Loaders
Bulldozers
Cranes
Dump trucks
Agricultural tractors
Combine harvesters
Military vehicles
Marine auxiliary engines
Generator sets

🏭 Heavy Industrial Equipment

Heavy-Duty PK belts are widely used in continuous-operation industrial drives requiring high reliability:

Industrial air compressors
Rotary screw compressors
Mining equipment
Quarry crushers
Bulk material conveyors
Paper manufacturing
Pulp processing
Large printing presses
Industrial HVAC systems
Commercial ventilation fans
Heavy woodworking
Sawmill equipment
Industrial pumps
Oil & gas equipment
Chemical processing
Power generation

🏗️ Large Commercial & Infrastructure

Selected heavy commercial and infrastructure applications use heavy-duty PK belts:

Commercial laundry equipment
Industrial washers
Heavy commercial fitness
Gym treadmills
Stair climbers
Industrial garage doors
Hangar doors
Stage lifting systems
Diesel generator sets
Backup power systems
Grain handling systems
Agricultural processing
Cement plant equipment
Steel mill auxiliary drives
Water treatment pumps
Wastewater blowers

For even higher torque heavy industrial drives requiring positive engagement, see our V-Belts product line.

Installation & Maintenance Guide for Heavy-Duty Applications

Proper installation and maintenance is critical for maximum service life in heavy-duty applications. Follow these key guidelines:

Pulley Alignment: Ensure all pulleys are perfectly parallel with maximum misalignment of 0.5° or less. Misalignment in heavy high-tension drives causes rapid uneven rib wear and belt tracking failure.

Correct Tension: Always use a calibrated belt tension gauge to set initial tension to heavy-duty manufacturer specifications. Under-tensioning causes slippage and squeal under load; over-tensioning damages bearings and shafts.

Inspect Tensioners & Idlers: Heavy-duty applications use high-force automatic tensioners — always verify tensioners operate smoothly with no binding, and that idler bearings turn freely without play. Seized tensioners are the #1 cause of premature heavy-duty belt failure.

Never Pry Belts On: Never use bars or screwdrivers to lever belts onto pulleys under tension, as this can cut or damage internal tensile cords leading to sudden catastrophic belt failure. Always fully release tensioner tension before installing belts.

Check Pulley Condition: Inspect pulley grooves for wear, rust, burrs, or embedded debris before installing new belts. Worn pulleys with irregular groove profiles will destroy new belts rapidly.

Keep Belts Clean: Heavy-duty engine compartments contain diesel, oil, and coolant — clean all pulley surfaces before installation and ensure no fluid leaks contaminate belts, as petroleum products degrade EPDM rubber over time.

Replacement Intervals: Replace heavy-duty PK belts every 120,000-180,000 km (75,000-110,000 miles) for on-highway trucks, every 2000-3000 operating hours for industrial applications, and annually for mining/construction equipment in harsh environments. Always replace tensioners and idlers with new belts.

Regular Inspections: Inspect belts at every service interval for signs of cracking, chunking, rib wear, fraying, or glazing. Replace belts immediately at first signs of damage to avoid costly roadside breakdowns or industrial downtime.

Heavy-Duty PK Poly-V Belt vs. Classical V-Belts

Feature	Heavy-Duty PK Poly-V Belt	Classical V-Belt
Standard Rib Counts	5PK – 15PK	A/B/C profile
Length Range	1505 mm – 4350 mm	All lengths
Tensile Cord	Heavy polyester / aramid option	Polyester/cotton
Temperature Rating	-40°C to +120°C	-30°C to +80°C
Maximum Power	Up to 500 HP	Up to 400 HP per belt
Typical Applications	Heavy trucks, buses, industrial drives	Legacy industrial drives
Service Life (Truck)	120,000-180,000 km	40,000-60,000 km

Not sure which PK belt profile is correct for your application? Our technical team can help you select the correct belt based on your equipment model, power requirements, and operating conditions. See our full range of power transmission belts for all available profiles.

Frequently Asked Questions

What is the rib pitch of PK Poly-V belts?

PK Poly-V belts have a standard rib pitch of 3.56 mm, which ensures precise engagement with mating pulleys for high-torque power transmission.

What effective length range is available for PK belts?

Our PK belts are available in effective lengths from 1505 mm to 4350 mm, covering 5PK, 6PK, 8PK, 10PK, 12PK, and 15PK profiles.

What is the temperature range of your PK Poly-V belts?

The operational temperature range is -40°C to +120°C, suitable for extreme cold starts and high-heat industrial environments.

What is the minimum pulley diameter for PK belts?

The minimum recommended pulley diameter is 25 mm, depending on the profile and application load.

What is the expected service life of these belts?

Under normal operating conditions, PK Poly-V belts deliver 120,000 to 180,000 km of service life, approximately 3x longer than standard rubber V-belts.

Are aramid cords available for high-load applications?

Yes, we offer optional aramid (Kevlar) tensile cords for high-shock-load and high-tension applications such as mining and heavy construction equipment.

Are your PK belts static-conductive?

Yes, our PK belts are manufactured to be static-conductive, making them safe for use in explosive or flammable environments such as chemical plants and grain handling facilities.

What applications are PK Poly-V belts used for?

They are widely used in heavy trucks, buses, construction machinery, agricultural equipment, mining vehicles, and industrial compressors.

What material are the belts made of?

Our PK belts are built with reinforced EPDM rubber compound and high-strength polyester or aramid cords, delivering up to 98% transmission efficiency.

Do you offer custom sizes for OEM orders?

Yes, we support OEM custom orders with specific lengths, cord materials, and temperature ratings. Contact us with your technical requirements for a quote.

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Get Competitive Pricing for Heavy-Duty PK V-Ribbed Belts

We stock 5PK, 6PK, 8PK, 10PK, 12PK, and 15PK profiles in effective lengths from 1505 mm – 4350 mm for fast global shipping. Custom lengths, aramid cord construction, special material compounds, and private label/OEM packaging options are available on request with short lead times. Minimum order quantity of 30 pieces applies for stock heavy-duty sizes, with discounted tiered pricing available for fleet and wholesale orders.

Contact our sales team today with your required rib count, length, quantity, cord type preference, and application details for a response within 24 hours.

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Heavy Industrial Drive Belt

PK Poly-V Belt 1505-4350mm, 3.56mm, 5-15PK, EPDM Supplier