Description
20M Timing Belt 1160-6560mm, 20mm 100/115/150/170/230/290/340mm CR, Heavy Duty Industrial Supplier
What Is an HTD 20M Synchronous Belt?
The HTD 20M synchronous belt (also known as the HTD 20M timing belt) is the largest-pitch, highest-load-capacity member of the HTD (High Torque Drive) curvilinear tooth belt family. With a 20 mm tooth pitch, a deep curvilinear tooth profile and a heavy-grade composite construction, it is engineered for the most demanding heavy-duty industrial power transmission applications.
Unlike trapezoidal-tooth timing belts, the rounded HTD 20M tooth profile ensures smooth meshing, uniform stress distribution and significantly higher torque capacity. The belt delivers up to 98% transmission efficiency, supports maximum linear speeds of up to 20 m/s and transmits up to approximately 600 HP, making it the preferred choice for high-torque, low-to-medium speed drives in heavy industry.
For smaller-pitch HTD profiles suited to lighter loads, see our HTD 14M Timing Belt product lines.
Materials & Construction
Every HTD 20M synchronous belt is built with a three-layer composite structure using premium, industry-grade materials for long service life and reliable performance under extreme loads.
| Layer | Material | Function |
|---|---|---|
| Tensile Cords (Backbone) | High-strength fibreglass cord; aramid cord optional | Exceptional tensile strength, minimal elongation and outstanding length stability under sustained heavy loads. |
| Belt Body | Premium chloroprene rubber (CR) | Excellent resistance to heat, oil, ozone and flex fatigue; retains flexibility and structural integrity over a wide temperature range. |
| Tooth Facing | Wear-resistant nylon fabric bonded to the tooth surface | Reduces friction and tooth wear, lowers running noise and extends belt service life under high load. |
Handling & Storage Notes
- Handle the belt with care during installation; avoid kinking, twisting or mechanically damaging it.
- Store belts in a cool, dry place away from heat sources; avoid prolonged exposure to sunlight, which can crack the rubber and damage the cords.
- Keep belts away from chemicals (especially strong acids and alkalis), oil and water during storage, installation and operation.
- Never bend the belt below the minimum recommended pulley diameter, and never use non-professional tools to pry it onto a pulley.
Standard Specifications
The following dimensional parameters define the HTD 20M tooth profile and belt geometry, as shown in the tooth profile and designation diagram below.
| Parameter | Value | Unit |
|---|---|---|
| Tooth Pitch (P) | 20 | mm |
| Tooth Height (ht) | 8.4 | mm |
| Belt Total Thickness (hs) | 13.2 | mm |
| Tooth Profile | Curvilinear (HTD) | – |
| Maximum Linear Speed | 20 | m/s |
| Transmission Efficiency | Up to 98% | – |
| Maximum Power Transmission | ~600 | HP |
| Operating Temperature Range | -30 to +90 | °C |
| Standard Pitch Lengths | 1160–6560 | mm |
| Standard Models | 24 models | – |
Key Advantages
Complete Model List
The table below lists every standard HTD 20M synchronous belt model, with its pitch line length and number of teeth. All models are available for order; custom lengths can be manufactured on request.
| Model Designation | Pitch Line Length (mm) | Number of Teeth |
|---|---|---|
| 1160-20M | 1160 | 58 |
| 1740-20M | 1740 | 87 |
| 2000-20M | 2000 | 100 |
| 2140-20M | 2140 | 107 |
| 2500-20M | 2500 | 125 |
| 2660-20M | 2660 | 133 |
| 2800-20M | 2800 | 140 |
| 2840-20M | 2840 | 142 |
| 3000-20M | 3000 | 150 |
| 3040-20M | 3040 | 152 |
| 3200-20M | 3200 | 160 |
| 3220-20M | 3220 | 161 |
| 3400-20M | 3400 | 170 |
| 3800-20M | 3800 | 190 |
| 4200-20M | 4200 | 210 |
| 4600-20M | 4600 | 230 |
| 4800-20M | 4800 | 240 |
| 5000-20M | 5000 | 250 |
| 5200-20M | 5200 | 260 |
| 5400-20M | 5400 | 270 |
| 5500-20M | 5500 | 275 |
| 5600-20M | 5600 | 280 |
| 6000-20M | 6000 | 300 |
| 6560-20M | 6560 | 328 |
All 20M synchronous belts are manufactured to the ISO 13050 standard for synchronous belt drives (20M profile), ensuring full dimensional interchangeability with equivalent-profile 20M belts from other mainstream international manufacturers.
Belt Naming Convention
HTD 20M belts follow the designation format: [Pitch Length] – [Pitch Code] – [Belt Width]. For example, 4200-20M-115 indicates a belt with a 4200 mm pitch line length, a 20M tooth profile (20 mm pitch) and a 115 mm belt width. Where the width is omitted the designation reads 4200-20M.
Applications
The HTD 20M synchronous belt is designed for heavy-duty industrial power transmission where high torque, precise synchronisation and long service life are critical:
- Mining & Quarrying: conveyor systems, crushers, ball mills and aggregate processing equipment.
- Cement & Steel Industry: rotary kiln drives, roller presses, bucket elevators and heavy material handling.
- Paper & Printing: large paper machine drives, printing press main drives and calender rolls.
- Textile Machinery: heavy loom drives, spinning frames and fabric processing lines.
- Power Generation: fan and pump drives, and auxiliary power transmission in thermal and hydroelectric plants.
- Heavy Manufacturing: machine tool main drives, forging equipment and large compressor drives.
- Construction Equipment: concrete mixers, hoists and heavy construction machinery drives.
- Industrial HVAC: large fans, blowers and air-handling systems.
- Long-Span Conveyors: bulk material handling over long distances.
- Commercial Laundry: industrial washers and dryers.
- Mining Equipment: heavy extraction and processing machinery.
Installation & Maintenance
Proper installation and maintenance are essential to achieve maximum belt life and performance:
- Pulley Alignment: ensure driving and driven pulleys are precisely aligned (parallel shafts, axially aligned grooves). Misalignment causes uneven tooth wear and edge fraying.
- Centre Distance Adjustment: always reduce centre distance before installing the belt; never force or pry the belt over pulley flanges, which damages the tensile cords.
- Tensioning: set initial tension per manufacturer recommendations. Over-tensioning causes bearing load and cord fatigue; under-tensioning causes tooth jumping.
- Pre-Run Check: after installation and initial tensioning, run the drive at low speed for a few minutes, then stop and recheck tension before full load.
- Regular Inspection: check belts periodically for cracked teeth, excessive tooth wear, frayed edges, cord damage or oil contamination, and replace worn belts promptly.
- Pulley Inspection: check pulley grooves for wear, damage or rust; worn pulleys accelerate belt wear and cause meshing problems.
- Environmental Protection: keep belts away from prolonged oil, grease, chemical and sunlight exposure, and ensure drive guards allow adequate ventilation.
Ordering Information
We supply the full range of HTD 20M synchronous belts in all standard lengths, as well as custom-manufactured belts for special applications. All belts are produced to ISO 13050 and are fully interchangeable with industry-standard HTD 20M synchronous belt specifications, metric 20 mm pitch timing belt profiles, and standard 20M power transmission belt dimensions for heavy-duty industrial drive systems.
| Model Designation | Pitch length + 20M, e.g. 4200-20M (see Section 5 for the full list) |
|---|---|
| Standard Models | 24 pitch lengths from 1160 mm to 6560 mm, all available for order |
| Custom Lengths | Manufactured on request to customer specification |
| Minimum Order Quantity | 5 piece |
| Packaging | Coiled, wrapped and packed in cartons on pallets |
| Delivery | Worldwide shipping; lead time confirmed at order |
Frequently Asked Questions
What is an HTD 20M timing belt?
The HTD 20M (High Torque Drive) timing belt is the largest-pitch member of the curvilinear-tooth synchronous belt family. It uses a 20 mm tooth pitch, an 8.4 mm tooth height and a 13.2 mm belt thickness, and is engineered for extreme heavy-duty industrial power transmission where high torque, precise synchronisation and long service life are critical.
What is the difference between HTD 20M and trapezoidal-tooth timing belts?
HTD 20M belts use a rounded curvilinear tooth with a full-radius root, so load is distributed evenly across the tooth. Compared with trapezoidal profiles such as XH and XXH, this gives higher torque capacity, smoother and quieter meshing, better resistance to tooth jump and longer service life under heavy loads.
How do I read a 20M belt model number such as 4200-20M-115?
The designation follows pitch length – pitch code – belt width. So 4200-20M-115 means a 4200 mm pitch line length, an HTD 20M profile with a 20 mm pitch, and a 115 mm belt width. Where the width is omitted, the model reads 4200-20M.
What standard lengths and widths are available?
We stock 24 standard pitch lengths from 1160 mm to 6560 mm in widths of 100, 115, 150, 170, 230, 290 and 340 mm. Custom lengths and non-standard widths can be manufactured on request.
What is the minimum order quantity and lead time?
The minimum order quantity is 5 pieces per size. Stock sizes ship quickly, and custom or OEM production lead times are confirmed when you place your order.
What applications are 20M timing belts used for?
HTD 20M belts are used for heavy-duty industrial drives such as mining and quarrying conveyors and crushers, cement and steel rotary kiln and roller press drives, paper machine and printing press drives, textile machine drives, power plant fan and pump drives, and long-span bulk material conveyors.
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