Sprocket Size Chart:Complete ANSI &Metric Sprocket Dimensions Guide
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- Oct 10,2025
Summary
Chain sprocket size chart covering ANSI and ISO standards. Learn how to choose the right sprocket size, understand key dimensions, and discover custom sprocket solutions from CTS China.
Industrial Sprockets
Industrial sprockets are toothed wheels designed to engage with roller chains. It transmits rotary motion between two shafts or drives a conveyor system.
Whether you're working with conveyor systems, agricultural machinery, or industrial drives, having the correct sprocket dimension size guarantees proper engagement and long service life.
Understanding Sprocket Dimensions
Before checking the sprocket size chart, it's important to understand what each dimension means:
| Term | Description | ||
| Chain Pitch | The distance between the centers of two adjacent chain roller pins | ||
| Number of Teeth | Determines rotation speed and torque ratio | ||
| Pin Diameter | Diameter measured through the centerline of the chain pins while wrapped around the sprocket | ||
Outside Diameter | Diameter from tooth tip to tooth tip | ||
Bore Diameter | The hole that fits the drive shaft | ||
Hub Diameter | Diameter of the central hub section | ||
Tooth Width | Determines chain compatibility | ||
Keyway & Set Screw | Used to secure the sprocket on the shaft | ||
Tips: Always ensure your sprockets' pitch matches your chain pitch (e.g., 0.5" pitch for ANSI #40 roller chain)
ANSI Sprocket Size Chart
Below is a simplified version of the ANSI standard sprocket size chart. For complete details, you can download the chain sprocket catalogue. If you need custom sprockets, please contact our engineers.
| Sprocket Size | Pitch | Sprocket Size | Pitch | Sprocket Size | Pitch |
| 1/4" | 3/4" | 2" | |||
| 3/8" | 1" | 2 1/4" | |||
| 1/2" | 1 1/4" | 2 1/2" | |||
1/2" | 1 1/2" | 3" | |||
5/8" | 1 3/4" |
| Sprocket Size | Pitch | Sprocket Size | Pitch | Sprocket Size | Pitch |
| 6 mm | 15.875 mm | 38.1 mm | |||
| 8 mm | 19.05 mm | 44.45 mm | |||
| 9.525 mm | 25.4 mm | 50.8 mm | |||
12.7 mm | 31.75 mm |
Tips: Metric chain sprockets are mainly used in Europe and Asia, while ANSI chain sprockets are dominant in North America
How to Choose the Right Sprocket Size
Selecting the correct sprocket isn't just about matching numbers—it's about ensuring performance, alignment, and durability.
Determine Number of Teeth
More teeth = smoother operation but less torque
Fewer teeth = higher torque but more chain wear
Check the Bore and Shaft Fit
Ensure correct bore diameter, keyway, and set screw size
Select Material and Hardness
Carbon steel for standard use
Hardeded steel for heavy-duty application
Stainless steel for corrosion resistance
Consider Environment
Use surface treatments (black oxide, zinc plating) in humid or dusty environments
Common Mistakes When Selecting Sprockets
✘ Choosing sprockets with incorrect pitch
✘ Ignoring the tooth count when calculating transmission ratio
✘ Forgetting chain alignment checks
✘ Overlooking lubrication and wear allowance
These small mistakes can lead to rapid chain wear, slippage, or even system failure
CTS Custom Sprocket Solution
At CTS-ChinaTransmissionS, we specialize in manufacturing standard and custom industrial sprockets for various power transmission systems.
✔ Customized bore size & keyways
✔ Material options: C45 steel, stainless steel, cast iron
✔ Surface treatments: Black oxide, zinc plating, heat treatment
✔ Precision machining: Hobbing, broaching, grinding
Whether you need single, double, or triple-strand sprockets, idler sprockets, or special non-standard designs, CTS can provide OEM and ODM support to meet your exact needs.
Contact us today to get custom industrial sprocket solution or quotation.
CTS Custom Sprocket Solution
Can I use a different tooth count on the same chain?
Yes, as long as the chain pitch is the same. Tooth count affects the speed ratio but not the chain fit.
Do I need heat-treated sprockets?
For high-load or continuous applications, heat-treated sprockets greatly increase wear life.
