Double sided timing belts are essential components in applications requiring bidirectional power transmission from both sides of the belt. With teeth on both the top and bottom surfaces, these belts enable reversing drives, serpentine drives, and compact transmission systems where space is limited and multiple components need to be driven from a single belt.

This guide explains how double sided timing belts work, the differences between pitch profiles, and how to select the right belt for your application.

1. What Is a Double Sided Timing Belt?

A double sided timing belt (also called a dual-sided synchronous belt or double-sided toothed belt) features trapezoidal teeth on both the top and bottom surfaces of the belt . Key characteristics include:

• Teeth on both sides – enables bidirectional power transmission

• Trapezoidal tooth profile – reliable, slip-free synchronous engagement

• Rubber/neoprene body – wear-resistant, oil-resistant, ozone-resistant 

• Fiberglass tension cord – high tensile strength, dimensional stability 

• Bidirectional capability – ideal for reversing and serpentine drives 

2. Double Sided vs Single Sided – Why Choose Double Sided?

✅ Choose double sided for applications requiring bidirectional power transmission, reversing drives, serpentine drives, and compact transmission systems where space is limited.

3. Pitch Profile Selection – D5M, DL, DH, DXH, DT5, DT10, DT20

Selection tip:

• Choose DT5 / D5M for light-duty, precision, and compact drives.

• Choose DL / DT10 for medium-duty conveying and packaging applications.

• Choose DH for medium-heavy machine tool and printing applications.

• Choose DXH / DT20 for heavy-duty industrial applications.

4. Reversing & Serpentine Drives – Why Double Sided Matters

Double sided timing belts are specifically designed for:

Reversing Drives:

• Applications requiring frequent direction changes

• The double-sided tooth profile ensures reliable engagement in both directions

Serpentine Drives:

• Single belt drives multiple pulleys in a serpentine path

• Teeth on both sides engage with pulleys on both the top and bottom runs

• Space-efficient – reduces the number of belts required 

💡 Double sided timing belts are ideal for reversing drives where the belt changes direction frequently, and serpentine drives where a single belt drives multiple components in a compact space .

5. Belt Construction – What Makes a Quality Double Sided Timing Belt?

6. Applications Where Double Sided Belts Excel

7. Installation & Maintenance Tips

1. Clean pulleys – Remove debris from pulleys before installation

2. Proper tension – Tension according to manufacturer’s recommendations

3. Alignment – Ensure pulleys are properly aligned to prevent tracking issues

4. No lubrication required – Timing belts are self-lubricating

5. Inspect regularly – Check for wear, cracks, or damage on both tooth surfaces

6. Keep clean – Remove dust and debris to prevent premature wear

8. Selection Checklist

• □ 

  Pitch profile: D5M, DL, DH, DXH, DT5, DT10, DT20 – match your application

• □ 

  Width: Custom – match your application

• □ 

  Length: Custom – measure your required length

• □ 

  Material: Rubber/neoprene – wear-resistant, oil-resistant 

• □ 

  Tension member: Fiberglass cord – high tensile strength, zero stretch 

• □ 

  Drive type: Reversing, serpentine, or standard

• □ 

  Application: Conveying, packaging, printing, automation, heavy industry

9. Conclusion

The double sided trapezoidal tooth synchronous belt from Apex Coupling offers the perfect combination of bidirectional power transmission, reliability, and durability for demanding industrial applications. With D5M to DT20 pitch profiles, fiberglass tension cords, and OEM customization, it is the ideal solution for reversing drives, serpentine drives, conveying systems, packaging machinery, printing equipment, and factory automation.

👉 Need a double sided timing belt for your application? Contact us with your pitch profile, width, length, and customization requirements.