A PK belt size is identified by three key specifications: rib count, PK profile, and effective length.

Example:

6PK1200 = 6 ribs + PK profile + 1200mm effective length

This complete PK Belt Size Chart provides a detailed reference for 3PK to 12PK belts, including belt sizes, dimensions, width specifications, replacement methods, and selection guidelines.

Whether you are an automotive distributor, repair specialist, importer, or OEM buyer, this guide helps you quickly identify the correct Poly V belt size and avoid incorrect replacements.

For a complete overview of automotive transmission systems, belt categories, and selection methods, visit our Automotive Belt Guide..

Quick PK Belt Size Reference Chart

A PK belt is identified by the number before “PK” and the length after it.

How to Read This PK Belt Size Chart

Example:

7PK1350

Therefore:

7PK1350 = 7-rib PK Poly V belt with 1350mm effective length.

What Is a PK Belt?

A PK belt is a type of multi-ribbed Poly V belt designed to transmit power through multiple longitudinal ribs.

In automotive applications, PK belts are commonly used as serpentine belts because one belt can drive multiple engine accessories.

Typical applications include:

• Alternators
• Air conditioning compressors
• Water pumps
• Power steering pumps

Compared with traditional V-belts, PK belts provide:

• Higher power transmission efficiency
• Better pulley contact
• Reduced vibration
• Compact installation
• Longer operating life

For complete automotive belt solutions, explore our range of Automotive Belts supplied for global aftermarket and OEM applications.

PK Belt vs Poly V Belt: Are They the Same?

Many buyers search for “PK belt” and “Poly V belt” as separate products.

In most cases:

A PK belt is a specific profile of Poly V belt.

The difference:

The term “PK” defines the belt geometry, while “Poly V belt” describes the overall belt type.

For a detailed explanation of PK belt identification, specifications, and applications, visit our PK Belt Guide.

How to Read PK Belt Numbers Correctly

The standard PK belt marking format is:

Rib Count + PK Profile + Length

Examples:

4PK1000

Meaning:

• 4 = four ribs
• PK = Poly V profile
• 1000 = 1000mm effective length

5PK1200

Meaning:

• 5 = five ribs
• PK = Poly V profile
• 1200 = 1200mm effective length

6PK1200

Meaning:

• 6 = six ribs
• PK = Poly V profile
• 1200 = 1200mm effective length

7PK1350

Meaning:

• 7 = seven ribs
• PK = Poly V profile
• 1350 = 1350mm effective length

8PK1600

Meaning:

• 8 = eight ribs
• PK = Poly V profile
• 1600 = 1600mm effective length

Understanding the belt number prevents common replacement mistakes, especially when two belts have the same length but different rib counts.

Learn more about Pk belt number meaning explained.

PK Belt Dimensions Explained

Understanding PK belt dimensions is important for correct replacement and system compatibility.

The main PK belt dimensions include:

A correct PK belt replacement must match:

• Rib count
• Belt profile
• Effective length
• Pulley design
• Application requirements

Incorrect dimensions may cause:

• Belt slipping
• Excessive vibration
• Noise
• Poor power transmission
• Premature failure

For automotive applications requiring high durability and temperature resistance, explore our EPDM PK Belts.

PK Belt Width Chart

The width of a PK belt depends on the number of ribs.

The calculation formula is:

Belt Width = Rib Count × 3.56mm

A higher rib count increases pulley contact area, allowing greater torque transmission capability.

For distributors requiring consistent dimensions and stable supply, Realshow provides professional Automotive Belt Manufacturer solutions.

How to Measure PK Belt Size Without Markings

If the original belt number is unreadable, you can identify the correct PK belt size through three steps.

Step 1: Count the Ribs

The first number represents rib quantity.

Examples:

• 4PK = 4 ribs
• 5PK = 5 ribs
• 6PK = 6 ribs
• 7PK = 7 ribs
• 8PK = 8 ribs

Step 2: Measure Effective Length

The final number represents belt length.

Examples:

• 5PK1200 = 1200mm
• 6PK1200 = 1200mm
• 7PK1350 = 1350mm

Step 3: Confirm Application Requirements

Different applications require different belt specifications.

Check:

• Engine system requirements
• Pulley arrangement
• Operating temperature
• Load conditions

For information about professional PK belt production and quality control, see:

How PK Belts Are Manufactured: From Rubber Compound Mixing to Final Inspection

Complete PK Belt Size Chart (3PK-12PK)

PK belts are available in different rib counts and lengths to meet different automotive and industrial transmission requirements.

The most common PK belt sizes include:

• 3PK
• 4PK
• 5PK
• 6PK
• 7PK
• 8PK
• 10PK
• 12PK

The number before “PK” represents the rib count, while the following number represents the effective length in millimeters.

Example:

6PK1200

= 6 ribs + PK profile + 1200mm length

3PK Belt Sizes Chart

A 3PK belt contains three ribs and is typically used in compact automotive systems requiring lower power transmission capacity.

Common 3PK Belt Sizes

3PK Belt Dimensions

Common applications:

• Compact vehicles
• Small accessory drive systems
• Lightweight transmission systems

4PK Belt Sizes Chart

A 4PK belt contains four ribs and is commonly used in smaller passenger vehicles and automotive accessory systems.

Common 4PK Belt Sizes

4PK Belt Dimensions

When selecting a 4PK belt replacement, always confirm:

• Rib quantity
• Belt length
• Pulley compatibility

A 4PK1000 and 5PK1000 have the same length but cannot replace each other because the rib count is different.

5PK Belt Sizes Chart

A 5PK belt is one of the most searched PK belt sizes and is widely used in passenger vehicles.

Google users frequently search for:

• 5PK belt sizes
• 5PK belt length
• 5PK belt dimensions

Common 5PK Belt Sizes

5PK Belt Dimensions

A 5PK belt provides a balance between compact design and reliable power transmission.

Common applications include:

• Passenger vehicles
• Light commercial vehicles
• Automotive accessory drives

For high-temperature automotive applications, Realshow supplies EPDM PK Belts designed for OEM replacement and aftermarket use.

6PK Belt Sizes Chart (Most Common Automotive PK Belt Size)

A 6PK belt is one of the most widely used automotive Poly V belt sizes worldwide.

It is commonly found in:

• Passenger cars
• SUVs
• Light trucks
• Engine accessory drive systems

Common 6PK Belt Sizes

6PK1200 Belt Meaning

The 6PK1200 belt is one of the most common automotive belt specifications.

It means:

A 6PK1200 replacement belt must maintain:

• Same rib count
• Same PK profile
• Same effective length

For more information about replacement selection, see our PK Belt Guide.

7PK Belt Sizes Chart

A 7PK belt provides increased contact area compared with 5PK and 6PK belts.

It is commonly used in applications requiring higher power transmission capability.

Typical applications:

• Larger passenger vehicles
• SUVs
• Commercial vehicles
• Heavy-duty accessory drives

Common 7PK Belt Sizes

7PK Belt Dimensions

The additional ribs provide:

• Larger pulley contact area
• Improved torque transmission
• Better load capability

8PK Belt Sizes Chart

An 8PK belt is designed for higher load transmission systems.

It is commonly used in:

• Commercial vehicles
• Heavy-duty equipment
• Industrial transmission systems

Common 8PK Belt Sizes

8PK Belt Dimensions

For customized belt specifications and bulk supply, explore our OEM Automotive Belt Manufacturer capabilities.

10PK Belt Sizes Chart

A 10PK belt is designed for higher power transmission applications.

Common applications include:

• Heavy-duty vehicles
• Industrial equipment
• High torque systems

12PK Belt Sizes Chart

A 12PK belt is designed for maximum power transmission capability.

Typical applications include:

• Heavy-duty vehicles
• Industrial machinery
• High-load transmission systems

PK Belt Size Cross Reference Guide

A PK belt cross reference helps buyers identify the correct replacement belt when the original belt marking is missing, damaged, or unavailable.

When selecting a replacement PK belt, the following specifications must match:

• Rib count
• PK profile
• Effective length
• Application requirements

A correct PK belt replacement should always follow the original specification rather than selecting only by belt length.

Common PK Belt Cross Reference Chart

Can Different PK Belt Sizes Replace Each Other?

No.

For example:

A 5PK1200 and a 6PK1200 have the same length but different rib numbers.

They are not interchangeable because:

• Belt width is different
• Pulley contact area is different
• Load capacity is different

A correct replacement requires:

Same rib count + same PK profile + same effective length

PK Belt Size by Application

Different PK belt sizes are used for different power transmission requirements.

The number of ribs usually increases when the system requires:

• Higher torque transmission
• Larger accessory loads
• More pulley contact area

Automotive PK Belt Application Chart

Common Components Driven by PK Belts

PK belts are commonly used to drive:

• Alternators
• Air conditioning compressors
• Water pumps
• Power steering pumps

Modern automotive systems prefer PK belts because one belt can drive multiple accessories through a compact routing system.

PK Belt vs V Belt vs Poly V Belt Comparison

Many buyers compare PK belts with traditional V-belts when selecting transmission solutions.

PK Belt vs V Belt

View more about PK belt vs V-belt vs poly v belt comparison.

Advantages of PK Belts Compared With Traditional V Belts

PK belts provide:

• Higher power transmission capability
• Better flexibility
• Reduced vibration
• More compact engine design
• Improved efficiency

For a complete overview of automotive belt types, visit our Automotive Belt Guide.

PK Belt vs Serpentine Belt: What’s the Difference?

The terms PK belt and serpentine belt are often used interchangeably in automotive applications.

However, they describe different aspects of the belt system.

A serpentine belt is usually a PK profile Poly V belt that drives multiple engine accessories using a single belt.

Therefore:

Most automotive serpentine belts are PK Poly V belts.

Learn more about difference between Pk belt and serpentine belt view PK Belt vs Serpentine Belt: Differences, Applications Guide.

Firgure out more about Serpentine Belt Routing Diagram Guide: How to Read, Replace Right Belt.

How to Choose the Right PK Belt Replacement

Selecting the correct replacement belt requires checking four factors.

1. Check Original Belt Marking

The easiest method is reading the belt code.

Example:

6PK1200

Means:

• 6 ribs
• PK profile
• 1200mm length

2. Count Rib Quantity

If the marking is unavailable:

Count the ribs manually.

Examples:

• 5 ribs = 5PK
• 6 ribs = 6PK
• 7 ribs = 7PK
• 8 ribs = 8PK

3. Measure Effective Length

The belt length should match the original specification.

Incorrect length may cause:

Belt Too Loose

Problems:

• Slipping
• Noise
• Reduced efficiency

Belt Too Tight

Problems:

• Excessive tension
• Bearing damage
• Shortened service life

4. Confirm Material Specification

Modern automotive PK belts commonly use EPDM rubber compounds.

EPDM provides:

• Heat resistance
• Weather resistance
• Crack resistance
• Long service life

For durable automotive applications, see our EPDM PK Belts.

Learn more about Pk belt materials.

Common PK Belt Failure Signs

Even high-quality PK belts require replacement after long-term operation.

Common failure symptoms include:

1. Visible Cracks

Cracking usually indicates:

• Rubber aging
• Heat exposure
• Excessive operating temperature

2. Belt Noise

Common symptoms:

• Squealing
• Chirping
• Whining sounds

Possible causes:

• Incorrect tension
• Belt wear
• Pulley misalignment

3. Rib Wear

Worn ribs may cause:

• Reduced pulley contact
• Slipping
• Poor power transmission

4. Belt Stretching

A stretched belt may result in:

• Reduced tension
• Poor accessory operation

5. Excessive Vibration

Possible causes:

• Incorrect belt size
• Damaged tensioner
• Pulley problems

Choosing the correct PK belt size and material can significantly improve service life.

Why PK Belt Size Accuracy Matters for OEM Buyers

For distributors, importers, and OEM customers, incorrect belt specifications can create:

• Installation problems
• Customer complaints
• Warranty issues
• Increased returns

A professional supplier should provide:

• Accurate dimensions
• Stable production quality
• Consistent performance
• Technical support

Realshow provides professional OEM Automotive Belt Manufacturer solutions for global automotive customers.

PK Belt Manufacturing Quality Factors

A reliable PK belt manufacturer should control every production stage:

Rubber Compound Mixing

Ensures:

• Heat resistance
• Wear resistance
• Elasticity

Tensile Cord Processing

Provides:

• Dimensional stability
• Load resistance
• Long-term reliability

Vulcanization Process

Ensures:

• Stable belt structure
• Consistent performance

Final Inspection

Includes:

• Dimension checking
• Appearance inspection
• Performance testing

Learn more about our production process:

How PK Belts Are Manufactured

Download Complete PK Belt Size Chart PDF

For automotive distributors, repair professionals, and OEM purchasing teams, having an accurate PK belt size reference can significantly reduce identification errors and improve replacement efficiency.

Our complete PK Belt Size Chart PDF can help you quickly identify:

• PK belt rib count
• Belt length specifications
• PK belt dimensions
• Common replacement sizes
• Poly V belt references

The complete reference guide is useful for:

• Automotive distributors
• Belt wholesalers
• Repair workshops
• Importers
• OEM purchasing departments

The PK belt catalog includes common sizes from:

• 3PK
• 4PK
• 5PK
• 6PK
• 7PK
• 8PK
• 10PK
• 12PK

For complete specifications and OEM supply support, contact our team through:

Contact Us

Why Choose Realshow as Your PK Belt Manufacturer?

Choosing the right PK belt supplier is important for distributors and OEM buyers who need stable quality and reliable supply.

Realshow specializes in automotive transmission belt manufacturing and provides professional belt solutions for global customers.

Our product range includes:

• Automotive V Belts
• Raw Edge V Belts
• Timing Belts
• PK Belts (Poly V Belts)
• Motorcycle and Scooter Belts

As an experienced Automotive Belt Manufacturer, Realshow focuses on:

Accurate Belt Dimensions

PK belts require precise control of:

• Rib profile
• Belt length
• Belt width
• Tensile strength

Accurate dimensions ensure:

• Proper pulley engagement
• Stable transmission performance
• Reduced installation problems

Stable Material Performance

Professional rubber compounds provide:

• Heat resistance
• Wear resistance
• Crack resistance
• Long service life

For high-performance automotive applications, our EPDM PK Belts are designed for modern engine environments.

OEM Manufacturing Capability

Global buyers often require customized belt solutions.

Realshow supports OEM projects including:

• Customized specifications
• Private label production
• Packaging solutions
• Bulk production

Our OEM capability supports:

• Automotive distributors
• Aftermarket suppliers
• Importers
• Industrial customers

Learn more about our capability as an OEM Automotive Belt Manufacturer.

How Realshow Ensures PK Belt Quality

A reliable PK belt supplier should control the complete manufacturing process.

Rubber Compound Mixing

The rubber compound directly affects:

• Heat resistance
• Flexibility
• Wear resistance

Tensile Cord Reinforcement

High-quality tensile cords improve:

• Dimensional stability
• Load capacity
• Service reliability

Belt Forming and Vulcanization

Controlled production ensures:

• Consistent belt structure
• Stable dimensions
• Reliable performance

Rib Grinding and Finishing

Precision rib processing ensures:

• Correct pulley fit
• Smooth operation
• Reduced vibration

Final Quality Inspection

Every production batch is evaluated through:

• Appearance inspection
• Dimension checking
• Performance verification

Learn more about the complete manufacturing process:

How PK Belts Are Manufactured: From Rubber Compound Mixing to Final Inspection

Frequently Asked Questions About PK Belt Sizes

What does PK mean on a belt?

PK refers to a specific Poly V belt profile.

The number before PK indicates the rib count, while the following number indicates the effective belt length.

Example:

6PK1200

means:

• 6 ribs
• PK profile
• 1200mm effective length

What are the most common PK belt sizes?

The most common automotive PK belt sizes include:

• 5PK
• 6PK
• 7PK
• 8PK

Among them, 6PK belts are widely used in automotive accessory drive systems.

What is the difference between 5PK and 6PK belts?

The difference is the number of ribs.

A:

• 5PK belt has 5 ribs
• 6PK belt has 6 ribs

The rib quantity affects:

• Belt width
• Pulley contact area
• Power transmission capability

They cannot normally replace each other even if the length is identical.

How do I identify my PK belt size?

You can identify a PK belt by:

1. Reading the belt marking
2. Counting the ribs
3. Measuring effective length

Example:

A belt marked:

7PK1350

means:

• 7 ribs
• PK profile
• 1350mm length

Are PK belts and serpentine belts the same?

In automotive applications, a PK belt is commonly used as a serpentine belt.

However:

• PK describes the belt profile
• Serpentine describes the routing system

What is the width of a 6PK belt?

A 6PK belt has approximately:

21.4mm width

Calculation:

6 ribs × 3.56mm rib pitch ≈ 21.4mm

Can I replace a PK belt with another length?

No.

A replacement PK belt must match:

• Rib count
• Profile
• Effective length
• Application requirements

Using the wrong size may cause:

• Slipping
• Noise
• Vibration
• Reduced belt life

What material are automotive PK belts made from?

Modern automotive PK belts are commonly made from EPDM rubber compounds.

EPDM provides:

• High temperature resistance
• Weather resistance
• Crack resistance
• Long service life

Where can I buy PK belts in bulk?

Global distributors and OEM buyers should work with manufacturers that provide:

• Stable production capacity
• Consistent specifications
• OEM support
• Technical assistance

Realshow supplies PK belts for international automotive customers.

Learn more about FAQ.

Request product information through:

Contact Us

Final Conclusion: Complete PK Belt Size Reference

Selecting the correct PK belt requires understanding three key specifications:

1. Rib count
2. PK profile
3. Effective length

A correct PK belt size ensures:

• Proper pulley engagement
• Efficient power transmission
• Reduced belt failure risk
• Longer operating life

This complete PK Belt Size Chart provides a practical reference for automotive buyers, distributors, repair professionals, and OEM customers.

For professional PK belt manufacturing, OEM supply, and customized solutions, explore:

• Automotive PK Belt Category
• PK Belt products
• Double sided pk belts products
• EPDM pk belts