Understanding Sprocket Standards: ANSI vs. DIN/ISO and How to Read Their Model Numbers

Understanding Sprocket Standards: ANSI vs. DIN/ISO and How to Read Their Model Numbers

Sprockets are key mechanical components used in power transmission systems with roller chains. When working internationally, understanding the differences between American (ANSI) and European (DIN/ISO) sprocket standards is essential, especially when reading model numbers or specifying hub types.


📘 1. ANSI (American Standard) Sprocket Naming – Common in North America and Japan

📌 Model Format:

复制编辑XXB-YY

Example: 60B-15

  • 60 = Chain number (based on pitch size in inches; here, 0.75 inches)
  • B = Hub type (A = no hub, B = single hub, C = double hub)
  • 15 = Number of teeth

🔢 Common ANSI Chain Numbers and Pitch (in inches):

Chain No.Pitch (P)Roller Dia.
250.250.130
350.3750.200
400.50.312
500.6250.400
600.750.469
801.000.625

The pitch usually follows a multiple of 1/8 inch (e.g. 60 × 1/8 = 0.75”).


📗 2. DIN/ISO (European Standard) Sprocket Naming – Common in Europe, Asia, Middle East

📌 Model Format:

复制编辑XXB-Y-ZT

Example: 08B-1-17T

  • 08B = Chain number (based on pitch in millimeters; 08B = 12.7 mm)
  • 1 = Number of chain rows (1 = single, 2 = double, 3 = triple)
  • 17T = Number of teeth (T = teeth)

🔢 Common European Chain Numbers and Pitch (mm):

Chain No.Pitch (P)Roller Dia. (d1)Roller Width (b1)
06B9.5256.355.72
08B12.78.517.75
10B15.87510.169.65
12B19.0512.0711.68
16B25.415.8817.02

DIN chains follow the metric system and conform to DIN 8187 or ISO 606 standards.


🔍 3. Key Differences Between ANSI and DIN/ISO Sprockets

FeatureANSI (American)DIN/ISO (European)
Unit SystemImperial (inches)Metric (mm)
Model Formate.g. 60B-15e.g. 08B-1-17T
Tooth ProfileThicker, robustSlimmer, more precise
Pitch System1/8 inch multiples6.35 mm multiples
Usage RegionsUSA, Canada, JapanEurope, China, SE Asia
Interchangeability❌ Not compatible❌ Not compatible

🧩 4. How to Identify Hub Types in European (DIN) Sprockets

Unlike ANSI, DIN/ISO sprockets do not explicitly state the hub type in the model number. However, you can identify it using the following methods:

🔧 A. Based on Physical Structure (Three Main Types):

TypeDescriptionHub Style
Type AFlat sprocketNo hub
Type BOne-sided hubHub on one side only
Type CDouble hub sprocketHubs on both sides

You can see the hub structure clearly in side-view drawings or physical samples.


📝 B. Based on Product Descriptions or Supplier Details

Watch for keywords in the product name or catalog:

DescriptionMeaning
“With hub”Has a hub (Type B or C)
“Hubless” / “Flat”No hub (Type A)
“Solid hub sprocket”Integrated hub structure
“Single-side hub”Type B
“Double-side hub”Type C

Example:

  • 08B-1-17T flat plate sprocket → Type A
  • 08B-1-17T with hub → Type B or C

🆔 C. Manufacturer-Specific Codes

Some suppliers may add custom suffixes:

  • 08B-1-17T-A → Type A
  • 08B-1-17T-B → Type B
  • 08B-1-17T-C → Type C

⚠️ Note: This is not standardized, so always refer to the catalog or drawing.


✅ 5. Practical Tips for Sales and Technical Staff

  • Always confirm hub type when quoting or ordering.
  • Include notes like: “with single hub” or “hubless flat type” in your quotes.
  • Provide drawings to avoid misunderstanding.
  • ANSI and DIN sprockets cannot be interchanged — match the customer’s chain standard.

🧾 Summary

Understanding sprocket model numbers and hub types is essential for correct selection and international communication. Whether you’re dealing with ANSI or DIN standards, pay close attention to pitch, hub design, and regional usage preferences.

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