Choosing the correct chain size is essential for ensuring reliable power transmission, minimizing wear, and extending equipment life. Whether you’re working with industrial machinery, agricultural equipment, motorcycles, conveyors, or manufacturing systems, selecting the proper chain helps maximize efficiency and reduce maintenance costs.
This guide includes standard roller chain size charts along with practical information about chain dimensions, chain numbering, and the factors to consider when selecting the right chain for your application.
Chain Size Chart
What Does a Chain Size Mean?
Chain size refers to a chain’s physical dimensions and load capacity. Standard chain numbers are based primarily on pitch, which is the distance between the centers of two adjacent pins.
A chain’s specifications typically include:
- Pitch
- Roller diameter
- Roller width
- Plate thickness
- Pin diameter
- Tensile strength
- Weight per foot
Understanding these measurements makes it easier to choose a compatible replacement chain and matching sprockets.
Single Strand Roller Chain Size Chart
| Part No. | Industry No. | Pitch (P) | Roller Width (W) | Roller Diameter (R) | Plate Height (H) | Plate Thickness (T) | Pin Diameter (D) | Overall Width (F) | Overall Width (G) | Unit of Measure | Average Tensile Strength (Lbs.) | Average Weight Per Foot (Lbs./Ft.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25R | 25 | 0.250 | 0.125 | 0.130 | 0.228 | 0.030 | 0.091 | 0.154 | 0.185 | inches | 1,036 | 0.087 |
| 35R | 35 | 0.375 | 0.188 | 0.200 | 0.356 | 0.050 | 0.142 | 0.232 | 0.277 | inches | 2,469 | 0.215 |
| 40R | 40 | 0.500 | 0.312 | 0.312 | 0.475 | 0.060 | 0.157 | 0.324 | 0.406 | inches | 4,188 | 0.417 |
| 41R | 41 | 0.500 | 0.250 | 0.306 | 0.390 | 0.050 | 0.142 | 0.263 | 0.334 | inches | 2,866 | 0.276 |
| 50R | 50 | 0.625 | 0.400 | 0.375 | 0.594 | 0.080 | 0.2000 | 0.400 | 0.488 | inches | 6,834 | 0.679 |
| 60R | 60 | 0.750 | 0.500 | 0.469 | 0.712 | 0.094 | 0.235 | 0.501 | 0.601 | inches | 9,259 | 0.974 |
| 80R | 80 | 1.000 | 0.625 | 0.625 | 0.950 | 0.125 | 0.313 | 0.650 | 0.803 | inches | 17,636 | 1.714 |
| 100R | 100 | 1.250 | 0.750 | 0.750 | 1.187 | 0.156 | 0.376 | 0.781 | 0.950 | inches | 25,353 | 2.654 |
| 120R | 120 | 1.500 | 1.000 | 0.875 | 1.425 | 0.187 | 0.4370 | 1.005 | 1.174 | inches | 34,392 | 3.790 |
| 140R | 140 | 1.750 | 1.000 | 1.000 | 1.662 | 0.219 | 0.5000 | 1.074 | 1.267 | inches | 46,297 | 4.959 |
| 160R | 160 | 2.000 | 1.250 | 1.125 | 1.900 | 0.250 | 0.563 | 1.290 | 1.459 | inches | 57,761 | 6.317 |
| 180R | 180 | 2.250 | 1.406 | 1.406 | 2.137 | 0.281 | 0.687 | 1.443 | 1.659 | inches | 84,216 | 8.514 |
| 200R | 200 | 2.500 | 1.500 | 1.562 | 2.375 | 0.312 | 0.781 | 1.589 | 1.825 | inches | 109,128 | 10.684 |
| 240R | 240 | 3.000 | 1.875 | 1.875 | 2.850 | 0.375 | 0.937 | 1.943 | 2.179 | inches | 154,323 | 16.396 |
Double Strand Roller Chain Size Chart
| PEER Part No. | Industry No. | Pitch (P) | Roller Width (W) | Roller Diameter (R) | Plate Height (H) | Plate Thickness (T) | Pin Diam (D) | Overall Width (F) | Overall Width (G) | Unit of Measure | Transverse pitch (K) | Average Tensile Strength (Lbs.) | Average Weight Per Foot (Lbs./Ft.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 35-2R | 35-2 | 0.375 | 0.188 | 0.200 | 0.356 | 0.050 | 0.142 | 0.441 | 0.469 | inches | 0.399 | 4,938 | 0.423 |
| 40-2R | 40-2 | 0.500 | 0.312 | 0.312 | 0.475 | 0.060 | 0.157 | 0.608 | 0.690 | inches | 0.566 | 8,377 | 0.820 |
| 50-2R | 50-2 | 0.625 | 0.375 | 0.400 | 0.594 | 0.080 | 0.200 | 0.755 | 0.850 | inches | 0.713 | 13,668 | 1.344 |
| 60-2R | 60-2 | 0.750 | 0.500 | 0.469 | 0.712 | 0.094 | 0.235 | 0.949 | 1.055 | inches | 0.897 | 18,518 | 1.929 |
| 80-2R | 80-2 | 1.000 | 0.625 | 0.625 | 0.950 | 0.125 | 0.312 | 1.224 | 1.386 | inches | 1.153 | 35,273 | 3.393 |
| 100-2R | 100-2 | 1.250 | 0.750 | 0.750 | 1.187 | 0.156 | 0.376 | 1.502 | 1.655 | inches | 1.408 | 50,706 | 5.282 |
| 120-2R | 120-2 | 1.500 | 1.000 | 0.875 | 1.425 | 0.187 | 0.437 | 1.895 | 2.060 | inches | 1.789 | 68,784 | 7.526 |
| 140-2R | 140-2 | 1.750 | 1.000 | 1.000 | 1.662 | 0.219 | 0.500 | 2.030 | 2.243 | inches | 1.924 | 92,594 | 9.851 |
| 160-2R | 160-2 | 2.000 | 1.250 | 1.125 | 1.900 | 0.250 | 0.563 | 2.457 | 2.567 | inches | 2.305 | 115,522 | 12.526 |
| 180-2R | 180-2 | 2.250 | 1.406 | 1.406 | 2.137 | 0.281 | 0.687 | 2.739 | 2.955 | inches | 2.592 | 168,433 | 16.893 |
| 200-2R | 200-2 | 2.500 | 1.500 | 1.562 | 2.375 | 0.312 | 0.781 | 2.998 | 3.234 | inches | 2.817 | 218,257 | 21.234 |
| 240-2R | 240-2 | 3.000 | 1.875 | 1.875 | 2.850 | 0.375 | 0.937 | 3.673 | 3.906 | inches | 3.458 | 308,647 | 32.523 |
Triple Strand Roller Chain Size Chart
| PEER Part No. | Industry No. | Pitch (P) | Roller Width (W) | Roller Diameter (R) | Plate Height (H) | Plate Thickness (T) | Pin Diam (D) | Overall Width (F) | Overall Width (G) | Unit of Measure | Transverse pitch (K) | Average Tensile Strength (Lbs.) | Average Weight Per Foot (Lbs./Ft.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 35-3R | 35-3 | 0.375 | 0.188 | 0.200 | 0.356 | 0.050 | 0.142 | 0.633 | 0.677 | inches | 0.399 | 7,407 | 0.631 |
| 40-3R | 40-3 | 0.500 | 0.312 | 0.312 | 0.475 | 0.060 | 0.157 | 0.890 | 0.975 | inches | 0.566 | 12,566 | 1.223 |
| 50-3R | 50-3 | 0.625 | 0.375 | 0.400 | 0.594 | 0.080 | 0.200 | 1.113 | 1.207 | inches | 0.713 | 20,502 | 2.002 |
| 60-3R | 60-3 | 0.750 | 0.500 | 0.469 | 0.712 | 0.094 | 0.235 | 1.400 | 1.506 | inches | 0.897 | 27,778 | 2.876 |
| 80-3R | 80-3 | 1.000 | 0.625 | 0.625 | 0.950 | 0.125 | 0.313 | 1.799 | 1.965 | inches | 1.153 | 52,910 | 5.067 |
| 100-3R | 100-3 | 1.250 | 0.750 | 0.750 | 1.187 | 0.156 | 0.376 | 2.224 | 2.338 | inches | 1.408 | 76,059 | 7.896 |
| 120-3R | 120-3 | 1.500 | 1.000 | 0.875 | 1.425 | 0.187 | 0.437 | 2.773 | 2.974 | inches | 1.789 | 103,176 | 11.242 |
| 140-3R | 140-3 | 1.750 | 1.000 | 1.000 | 1.662 | 0.219 | 0.500 | 2.997 | 3.194 | inches | 1.924 | 138,891 | 14.736 |
| 160-3R | 160-3 | 2.000 | 1.250 | 1.125 | 1.900 | 0.250 | 0.563 | 3.613 | 3.691 | inches | 2.305 | 173,283 | 18.741 |
| 180-3R | 180-3 | 2.250 | 1.406 | 1.406 | 2.137 | 0.281 | 0.687 | 4.035 | 4.251 | inches | 2.592 | 252,649 | 25.266 |
| 200-3R | 200-3 | 2.500 | 1.500 | 1.562 | 2.375 | 0.312 | 0.781 | 4.406 | 4.642 | inches | 2.817 | 327,386 | 31.784 |
| 240-3R | 240-3 | 3.000 | 1.875 | 1.875 | 2.850 | 0.375 | 0.937 | 5.402 |
Quad Strand Roller Chain Size Chart
| PEER Part No. | Industry No. | Pitch (P) | Roller Width (W) | Roller Diameter (R) | Plate Height (H) | Plate Thickness (T) | Pin Diam (D) | Overall Width (F) | Overall Width (G) | Unit of Measure | Transverse pitch (K) | Average Tensile Strength (Lbs.) | Average Weight Per Foot (Lbs./Ft.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50-4R | 50-4 | 0.625 | 0.375 | 0.400 | 0.594 | 0.080 | 0.200 | 1.483 | 1.550 | inches | 0.713 | 28,439 | 2.674 |
| 60-4R | 60-4 | 0.750 | 0.500 | 0.469 | 0.712 | 0.094 | 0.235 | 1.848 | 1.955 | inches | 0.897 | 37,919 | 3.830 |
| 80-4R | 80-4 | 1.000 | 0.625 | 0.625 | 0.950 | 0.125 | 0.313 | 2.392 | 2.526 | inches | 1.153 | 70,547 | 6.760 |
| 100-4R | 100-4 | 1.250 | 0.750 | 0.750 | 1.187 | 0.156 | 0.376 | 2.909 | 3.063 | inches | 1.408 | 117,506 | 10.516 |
| 120-4R | 120-4 | 1.500 | 1.000 | 0.875 | 1.425 | 0.187 | 0.437 | 3.682 | 3.832 | inches | 1.789 | 155,425 | 14.971 |
| 140-4R | 140-4 | 1.750 | 1.000 | 1.000 | 1.662 | 0.219 | 0.500 | 3.959 | 4.152 | inches | 1.924 | 213,407 | 19.648 |
| 160-4R | 160-4 | 2.000 | 1.250 | 1.125 | 1.900 | 0.250 | 0.563 | 4.746 | 4.920 | inches | 2.305 | 267,200 | 25.004 |
| 180-4R | 180-4 | 2.250 | 1.406 | 1.406 | 2.137 | 0.281 | 0.687 | 5.331 | 5.547 | inches | 2.592 | 336,866 | 33.639 |
| 200-4R | 200-4 | 2.500 | 1.500 | 1.562 | 2.375 | 0.312 | 0.781 | 5.814 | 6.050 | inches | 2.817 | 436,515 | 42.200 |
| 240-4R | 240-4 | 3.000 | 1.875 | 1.875 | 2.850 | 0.375 | 0.937 | 7.130 | 7.366 | inches | 3.458 | 617,294 | 64.643 |
Heavy Series Single Strand Size Chart
| PEER Part No. | Industry No. | Pitch (P) | Roller Width (W) | Roller Diameter (R) | Plate Height (H) | Plate Thickness (T) | Pin Diam (D) | Overall Width (F) | Overall Width (G) | Unit of Measure | Average Tensile Strength (Lbs.) | Average Weight Per Foot (Lbs./Ft.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25HR | 25H | 0.250 | 0.125 | 0.130 | 0.229 | 0.040 | 0.091 | 0.174 | 0.603 | inches | 1,160 | 0.108 |
| 50HR | 50H | 0.625 | 0.375 | 0.400 | 0.594 | 0.094 | 0.2000 | 0.435 | 0.474 | inches | 8,157 | 0.766 |
| 60HR | 60H | 0.750 | 0.500 | 0.469 | 0.712 | 0.125 | 0.235 | 0.567 | 0.618 | inches | 11,905 | 1.163 |
| 80HR | 80H | 1.000 | 0.625 | 0.625 | 0.950 | 0.156 | 0.313 | 0.715 | 0.793 | inches | 21,495 | 1.996 |
| 100HR | 100H | 1.250 | 0.750 | 0.750 | 1.187 | 0.187 | 0.376 | 0.860 | 0.998 | inches | 30,424 | 3.017 |
| 120HR | 120H | 1.500 | 1.000 | 0.875 | 1.425 | 0.219 | 0.437 | 1.072 | 1.265 | inches | 41,447 | 4.207 |
| 140HR | 140H | 1.750 | 1.000 | 1.000 | 1.662 | 0.250 | 0.5000 | 1.144 | 1.345 | inches | 54,895 | 5.477 |
| 160HR | 160H | 2.000 | 1.250 | 1.125 | 1.900 | 0.281 | 0.563 | 1.339 | 1.546 | inches | 68,784 | 7.109 |
| 180HR | 180H | 2.250 | 1.406 | 1.406 | 2.137 | 0.312 | 0.6870 | 1.521 | 1.738 | inches | 97,444 | 9.206 |
| 200HR | 200H | 2.500 | 1.500 | 1.562 | 2.375 | 0.375 | 0.781 | 1.715 | 1.934 | inches | 113,759 | 12.835 |
What is a Chain Size Chart?
A chain size chart is a reference table that lists the dimensions and specifications of standard chains. It allows engineers, mechanics, and equipment owners to compare different chain sizes based on measurements such as pitch, roller diameter, width, and tensile strength.
Instead of guessing, a chain size chart helps ensure the selected chain matches the equipment’s load requirements, operating speed, and sprocket dimensions.
Common Types of Chains
Different applications require different chain designs.
Roller Chains
The most common power transmission chain used in industrial equipment, conveyors, motorcycles, and agricultural machinery.
Double-Strand Chains
Designed for applications requiring greater strength than a single-strand chain while maintaining the same pitch.
Triple and Quad-Strand Chains
These chains provide even higher load capacity and are commonly used in heavy-duty industrial machinery.
Heavy Series Chains
Heavy-duty chains feature thicker side plates for increased tensile strength and improved resistance to shock loads.
Understanding Chain Numbering
ANSI roller chain numbers follow a simple numbering system.
For example:
ANSI #60 Chain
- 6 indicates the pitch is 6/8 inch (0.75 inch).
- 0 identifies the standard roller width.
Likewise:
- #40 = 1/2 inch pitch
- #50 = 5/8 inch pitch
- #80 = 1 inch pitch
Knowing this numbering system helps identify compatible replacement chains quickly.
Components of a Chain Size Chart
A chain size chart comprises several key components essential for accurate chain selection. These include parameters like pitch, roller diameter, and width, which are crucial in determining compatibility with specific applications. Pitch, representing the distance between chain links, influences factors such as speed and torque transmission.
Roller diameter impacts load capacity and wear resistance, while width determines compatibility with sprockets and other components. Balancing these parameters is essential for achieving optimal performance and longevity in chain-driven systems, necessitating careful consideration during the selection process.
Understanding Chain Size Nomenclature
Understanding chain size nomenclature involves decoding the alphanumeric codes used to label chain sizes. Each part of the code holds significance, aiding in easier interpretation. For instance, the first few characters may indicate the chain type or series, followed by numbers representing pitch and roller diameter. Deciphering these codes is essential for accurate chain selection, as they provide valuable insights into factors like load capacity and compatibility with sprockets.
However, navigating through these codes can pose challenges, requiring careful attention to detail and consideration of various factors.
Importance of Choosing the Right Chain Size
Choosing the right chain size is paramount, as using the wrong size can lead to severe consequences. Safety hazards, such as chain failure or unexpected breakage, pose significant risks to both personnel and equipment. Moreover, operational inefficiencies, including decreased performance and increased downtime, can result from mismatched chain sizes. Balancing factors like load capacity and speed is crucial, as opting for an undersized chain may compromise strength and durability while oversizing can lead to unnecessary expenses and excessive wear.
Therefore, careful consideration of the impact is essential when making decisions about the Chain Size Chart.
How to Use a Chain Size Chart
Utilizing a chain size chart effectively involves several steps to ensure accurate interpretation and application. First, identify the specific parameters listed on the chart, such as pitch, roller diameter, and width. Next, determine the requirements of your application, considering factors like load capacity, speed, and environmental conditions. Then, locate the appropriate chain size based on these parameters and requirements.
For example, in a high-load application requiring precise synchronization, a roller chain with a larger pitch and diameter may be suitable. Conversely, in a low-load application with limited space, a smaller pitch and width may be preferable. By carefully analyzing real-world applications and corresponding chain size selections, individuals can gain insights into the tradeoffs involved and the challenges associated with different approaches.
Ultimately, considering the impact of each decision is crucial in ensuring optimal performance and safety when utilizing the Chain Size Chart.
Factors to Consider When Selecting Chain Size
Selecting the correct chain requires balancing several important factors.
Load Capacity
The chain should safely handle both normal operating loads and occasional shock loads.
Operating Speed
High-speed equipment may require chains specifically designed for smoother operation and reduced wear.
Environment
Dust, moisture, chemicals, and extreme temperatures all influence chain life. Corrosion-resistant or sealed chains may be necessary in harsh environments.
Lubrication
Proper lubrication greatly extends chain life. Some applications require specialty lubricants or maintenance-free chain designs.
Sprocket Compatibility
Always ensure the chain pitch matches the sprocket. Even small dimensional differences can lead to rapid wear and poor performance.
How to Measure an Existing Chain
If the chain number is unreadable, measure the following:
- Pitch (center of one pin to the next)
- Roller diameter
- Roller width
- Pin diameter
- Number of strands
These measurements can usually identify the correct replacement using a chain size chart.
Common Mistakes to Avoid
Avoid these common sizing mistakes:
- Selecting a chain based only on appearance.
- Ignoring pitch compatibility with sprockets.
- Underestimating shock loads.
- Using worn sprockets with a new chain.
- Neglecting lubrication and regular maintenance.
- Choosing an oversized chain without verifying equipment compatibility.
Typical Applications by Chain Type
| Chain Type | Common Applications |
|---|---|
| Single Strand | Conveyors, motorcycles, light machinery |
| Double Strand | Agricultural equipment, packaging machines |
| Triple Strand | Heavy industrial drives |
| Quad Strand | Mining, steel processing, high-load conveyors |
| Heavy Series | Construction equipment, crushers, industrial machinery |
Case Studies
Case studies provide concrete examples of the benefits derived from selecting the right chain size using chain size charts. In one instance, a manufacturing plant faced frequent breakdowns and increased maintenance costs due to using undersized chains in their conveyor system. By consulting a chain size chart and selecting chains with appropriate pitch and load capacity, they experienced a significant reduction in downtime and maintenance expenses while improving overall system reliability.
In another case, an automotive assembly line struggled with inefficiencies caused by using oversized chains, leading to excessive wear and energy consumption. By utilizing a chain size chart to downsize to chains with optimal specifications, they achieved notable savings in energy costs and reduced wear on components, resulting in improved production efficiency and cost savings.
These case studies demonstrate the tangible benefits of choosing the right chain size through informed decision-making using chain size charts. By considering factors like load capacity, operating conditions, and maintenance requirements, businesses can optimize their systems for improved performance, reliability, and cost-effectiveness.
However, it’s essential to acknowledge the tradeoffs involved and the challenges associated with balancing various factors to achieve the desired outcomes. Ultimately, the impact of selecting the right chain size using a chain size chart can have far-reaching benefits across industries, underscoring its importance in modern engineering and manufacturing practices.
Conclusion
A chain size chart is an essential reference for selecting the correct roller chain for industrial, agricultural, automotive, and mechanical applications. By understanding chain dimensions, numbering systems, tensile strength, and operating requirements, you can confidently choose a chain that delivers reliable performance and long service life.
Whether you’re replacing an existing chain or designing a new drive system, taking the time to verify chain size, sprocket compatibility, and operating conditions helps reduce downtime, improve efficiency, and extend the life of your equipment.
FAQs
Why is it important to use a chain size chart?
Chain size charts provide valuable guidance in selecting the right chain size for specific applications. They help optimize performance, ensure safety, and minimize downtime by considering factors like load capacity, speed, and environmental conditions.
What are the key components included in a chain size chart?
Chain size charts typically include parameters such as pitch, roller diameter, and width. These components are essential for accurately identifying the appropriate chain size for a given application.
How do I interpret chain size nomenclature?
Deciphering chain size nomenclature involves understanding the alphanumeric codes used to designate chain sizes. Each part of the code signifies different aspects such as chain type, pitch, and roller diameter, aiding in easier interpretation.
What are the consequences of using the wrong chain size?
Using the wrong chain size can lead to safety hazards, operational inefficiencies, and increased maintenance costs. It may result in premature wear, system failures, and compromised performance, highlighting the importance of accurate chain size selection.
How do environmental factors influence chain size selection?
Environmental factors such as temperature extremes, exposure to moisture or chemicals, and the presence of abrasive materials can impact chain durability and performance. Considering these factors is crucial for selecting a chain size that can withstand the specific operating conditions.
How do I know what size chain I need?
Check the existing chain number if it’s still visible. If not, measure the chain’s pitch, roller diameter, and width, then compare those dimensions with a standard chain size chart.
What is the most common roller chain size?
ANSI #40, #50, #60, and #80 roller chains are among the most commonly used sizes across industrial and agricultural equipment.
Can I replace a chain with a heavier series chain?
Sometimes, but only if it remains compatible with the existing sprockets and equipment design. Always verify manufacturer recommendations before upgrading.
Do chain size charts apply worldwide?
Most industrial roller chains follow ANSI or ISO standards. However, metric chains and British Standard (BS) chains use different numbering systems, so always confirm the applicable standard.