Poly Chain GT Carbon Belts
Poly Chain GT Carbon Belts
Poly Chain GT Carbon is Gates' highest-performance synchronous belt, engineered to replace roller chain drives in demanding industrial applications. It combines a polyurethane body, the GT curvilinear tooth profile, and carbon fiber tensile cords to deliver load ratings that match or exceed roller chain without lubrication, chain stretch, noise, or the maintenance burden that comes with chain drives.
Texas Belting stocks Poly Chain GT Carbon belts in 8M and 14M pitches across all standard widths and lengths. We also provide chain-to-belt conversion assistance, including cross-referencing your current ANSI chain size to the correct Poly Chain belt and sprocket combination.
What Makes Poly Chain GT Carbon Different
Poly Chain GT Carbon is not a standard timing belt with a different name. Three construction features set it apart from every other synchronous belt on the market:
- Carbon fiber tensile cord. Standard timing belts use fiberglass cords. Poly Chain uses carbon fiber, which provides significantly higher tensile strength, lower elongation, and better fatigue resistance. This is the primary reason Poly Chain can match roller chain load ratings.
- Polyurethane body. Standard industrial timing belts use neoprene or HNBR rubber. Poly Chain uses a polyurethane compound that resists oil, grease, chemicals, and moisture far better than rubber. The polyurethane body also does not dry out, crack, or degrade in the way rubber compounds do over long service periods.
- GT tooth profile. Poly Chain uses the Gates GT curvilinear tooth geometry (the same optimized profile used in PowerGrip GT3), providing lower backlash and more uniform load distribution than standard HTD or trapezoidal tooth profiles.
Advantages Over Roller Chain
No lubrication required
Roller chain requires regular lubrication to prevent wear, corrosion, and premature failure. Poly Chain runs completely dry. This eliminates lubricant costs, contamination risk in food and clean environments, and slip hazards from oil drips.
Significantly quieter
Chain drives generate substantial noise from metal-on-metal contact between chain links, sprocket teeth, and the chain tensioner. Poly Chain runs 10 to 15 dB quieter than equivalent chain drives, improving the work environment.
Lighter weight
A Poly Chain belt weighs approximately 80% less than the roller chain it replaces. This reduces inertia on start/stop drives, lowers bearing loads, and makes installation and handling easier.
No chain stretch
Roller chain elongates as pins and bushings wear, requiring periodic tension adjustment and eventually chain replacement. Poly Chain does not stretch, maintaining consistent drive geometry and speed ratio throughout its service life.
Longer service life
In many applications, Poly Chain GT Carbon outlasts roller chain by 2x to 3x. The carbon fiber cord does not fatigue the way steel chain links do, and the polyurethane body does not corrode or rust.
Lower total cost
Higher upfront belt cost is offset by zero lubrication cost, reduced maintenance labor, fewer replacement cycles, less downtime, and extended bearing life from lower drive weight and tension.
Poly Chain GT Carbon vs. Roller Chain
| Characteristic | Poly Chain GT Carbon | ANSI Roller Chain |
|---|---|---|
| Drive type | Positive (toothed belt on sprockets) | Positive (chain links on sprockets) |
| Lubrication | None required | Regular lubrication essential |
| Noise | Low (10 to 15 dB quieter than chain) | High (metal-on-metal contact noise) |
| Weight | Approximately 80% lighter than equivalent chain | Heavy (steel links) |
| Stretch / elongation | Near-zero (carbon fiber cord) | Progressive elongation as pins and bushings wear |
| Maintenance | Very low. No lubrication, no tension adjustment. | High. Regular lubrication, periodic tension adjustment, chain inspection. |
| Service life | Typically 2x to 3x longer than chain in comparable applications | Shorter. Wear on pins, bushings, and rollers limits life. |
| Corrosion resistance | Excellent. Polyurethane and carbon fiber do not rust. | Poor unless stainless steel chain is used (at much higher cost). |
| Shock load tolerance | Moderate. Teeth can shear under extreme overload. | Good. Chain absorbs shock through link deflection. |
| Initial cost | Higher (belt + sprockets) | Lower (chain + sprockets) |
| Total cost of ownership | Lower in most continuous-duty applications due to zero maintenance and longer life. | Higher due to lubrication, maintenance, and more frequent replacement. |
| Clean environment suitability | Excellent. No lubricant contamination. Used in food processing zones. | Poor. Oil and grease contaminate surrounding area. |
Poly Chain GT Carbon Specifications
| Specification | 8MGT (8 mm Pitch) | 14MGT (14 mm Pitch) |
|---|---|---|
| Pitch | 8 mm | 14 mm |
| Tooth profile | GT curvilinear | GT curvilinear |
| Body material | Polyurethane | Polyurethane |
| Tensile cord | Carbon fiber | Carbon fiber |
| Temperature range | -65°F to +185°F | -65°F to +185°F |
| Standard widths | 12 mm, 21 mm, 36 mm, 62 mm | 20 mm, 37 mm, 68 mm, 90 mm, 125 mm |
| Pitch length range | 480 mm to 4,400 mm (typical stock range) | 966 mm to 6,860 mm (typical stock range) |
| Load class | Medium to Heavy (chain replacement tier) | Heavy to Maximum (chain replacement tier) |
How to Read a Poly Chain Part Number
Poly Chain GT Carbon part numbers use the same format as Gates PowerGrip GT3 belts:
| Part Number | Pitch | Pitch Length | Width |
|---|---|---|---|
| 8MGT-1120-21 | 8 mm GT | 1120 mm | 21 mm |
| 8MGT-1600-36 | 8 mm GT | 1600 mm | 36 mm |
| 14MGT-1400-68 | 14 mm GT | 1400 mm | 68 mm |
| 14MGT-2800-90 | 14 mm GT | 2800 mm | 90 mm |
Converting from Roller Chain to Poly Chain
Converting an existing roller chain drive to Poly Chain GT Carbon requires replacing the chain, both sprockets, and potentially adjusting the center distance. Here is what the conversion involves:
- Step 1: Identify the existing chain. Record the ANSI chain number (e.g., #40, #50, #60, #80), the number of chain links, the sprocket tooth counts on both driver and driven shafts, and the center distance.
- Step 2: Calculate the design load. Determine the motor horsepower, operating speed, and service factor for your application. This confirms the correct Poly Chain pitch and width.
- Step 3: Select the Poly Chain belt and sprockets. Gates provides conversion charts that map ANSI chain numbers to equivalent Poly Chain sizes. Texas Belting can run this selection for you. See our Sprocket Selection Guide for more on matching sprockets to belts.
- Step 4: Verify center distance. The new sprocket diameters may differ slightly from the original chain sprockets. Confirm that the motor mount or shaft positions can accommodate the new center distance, or plan for an adjustment slot or tensioner.
- Step 5: Install and tension. Poly Chain belts require less tension than roller chain. Follow Gates' tensioning specifications for the specific belt size.
Texas Belting provides complete chain-to-Poly Chain conversion assistance. Call 888-203-2358 with your current chain size, sprocket tooth counts, center distance, motor HP, and operating speed. We will recommend the correct Poly Chain belt and sprocket combination and provide a complete conversion quote.
Common Applications
| Application | Recommended Pitch | Why Poly Chain |
|---|---|---|
| Industrial pumps and compressors | 8M or 14M | High torque, continuous duty, no lubrication, extended service life. |
| Food processing drive systems | 8M or 14M | Eliminates chain lubricant contamination in food zones. No-lube operation. |
| Heavy conveyors | 8M or 14M | Chain-level load capacity with less weight, no maintenance, and quieter operation. |
| Aggregate and mining equipment | 14M | Dust and moisture resistant. No lubrication to attract abrasive material. |
| Wastewater treatment | 8M or 14M | Corrosion resistant (no steel to rust). Moisture and chemical resistant. |
| Packaging equipment | 8M | Clean, quiet, precise. No lubricant contamination on packaged product. |
| HVAC blowers and fans | 8M | Quiet operation, zero maintenance, clean air handling environment. |
| Woodworking and lumber | 8M or 14M | Sawdust and debris do not damage belt the way they accelerate chain wear. |
| Agricultural equipment | 8M or 14M | No lubrication in dusty environments. Resists moisture and chemical exposure. |
Poly Chain vs. PowerGrip HTD vs. PowerGrip GT3
All three are Gates timing belt products that share overlapping pitch sizes (8M and 14M). Here is how they compare:
| Feature | PowerGrip HTD | PowerGrip GT3 | Poly Chain GT Carbon |
|---|---|---|---|
| Body material | Neoprene | HNBR | Polyurethane |
| Tensile cord | Fiberglass | Fiberglass | Carbon fiber |
| Load capacity | Baseline | Up to 25% higher than HTD | Highest. Chain-replacement tier. |
| Temperature range | -30°F to +185°F | -65°F to +250°F | -65°F to +185°F |
| Chemical / oil resistance | Moderate | Better | Best (polyurethane) |
| Backlash | Low | Near-zero | Low to near-zero (GT profile) |
| Cost | Lowest | Mid-range | Highest |
| Best for | General industrial drives | Precision, servo, high-temp | Chain replacement, heavy duty, no-lube, food zones |
Frequently Asked Questions
Yes. Poly Chain GT Carbon was specifically developed by Gates as a roller chain alternative. In most industrial drive applications, a properly sized Poly Chain belt delivers equivalent or higher load capacity than the ANSI roller chain it replaces, while eliminating lubrication, reducing noise by 10 to 15 dB, and lasting 2 to 3 times longer. It is not suitable for every chain application (some extreme shock load or very high-speed chain drives may not convert), but the majority of standard industrial chain drives can be successfully converted.
Yes. Poly Chain belts run on GT-profile sprockets (toothed pulleys) that are matched to the GT tooth geometry. Standard HTD pulleys are not recommended for Poly Chain applications because the tooth engagement is not optimized. When converting from roller chain, both the chain sprockets and the chain itself are replaced with Poly Chain sprockets and a Poly Chain belt. Texas Belting supplies matched belt and sprocket sets. See our Sprocket Selection Guide for details on matching sprockets to belt profiles.
Poly Chain GT Carbon is available in two pitches: 8 mm (8MGT) and 14 mm (14MGT). The 8M pitch covers medium to heavy duty applications. The 14M pitch covers heavy to maximum duty applications. Together, these two pitches address the range of ANSI roller chain from approximately #40 through #100 and beyond.
Poly Chain GT Carbon is not FDA approved for direct food contact. Its primary food-industry advantage is eliminating chain lubrication contamination in food processing zones. If the belt itself must contact food, an FDA-approved polyurethane timing belt with an FDA-compliant compound is required. See our Food Grade Timing Belts page for FDA-compliant options.
Yes. Provide your current ANSI chain number, sprocket tooth counts, center distance, motor HP, and operating speed, and our team will recommend the correct Poly Chain belt and sprocket combination. We use Gates' conversion selection tools and stock the most common Poly Chain sizes for fast delivery. Call 888-203-2358 or submit your drive specifications through our contact form.
Both use the GT tooth profile, but Poly Chain uses a polyurethane body with carbon fiber cord while GT3 uses HNBR rubber with fiberglass cord. Poly Chain delivers higher load capacity (chain-replacement level) and better chemical resistance. GT3 provides higher temperature capability (250°F vs. 185°F) and near-zero backlash for precision positioning. Choose Poly Chain for heavy-duty chain replacement and no-lube applications. Choose GT3 for servo drives, CNC, and high-temperature environments.
Yes. Texas Belting stocks the most popular Poly Chain sizes in 8M and 14M pitches at our Houston warehouse. In-stock items ship same day when ordered before the daily cutoff. For less common lengths or widths, typical lead time is 3 to 5 business days. Call 888-203-2358 to check availability on your specific part number.
Poly Chain Drive Components
Every Poly Chain belt needs a matched Poly Chain GT sprocket. Standard HTD sprockets are not recommended for Poly Chain drives. Browse our Poly Chain drive components, or see our Sprocket Selection Guide for help choosing the right one.
Related Pages
Ready to Replace Chain with Poly Chain?
Texas Belting stocks Gates Poly Chain GT Carbon in 8M and 14M pitches and provides full chain-to-belt conversion support. Send us your chain drive specifications and we will recommend the right Poly Chain belt, sprockets, and conversion plan.
Request a Quote Call 888-203-2358