टाइमिंग पुली
Zero Slip. Zero Compromise.
HTD, metric T-series, European standard, XL/L/H/XH — every timing pulley series manufactured in-house with exacting tooth profile accuracy for synchronous drive reliability.
Synchronous Drive Components for Zero-Slip Power Transmission
Timing pulleys — also called synchronous pulleys or toothed pulleys — are precision-machined wheels with evenly spaced teeth that engage a matching timing belt. Unlike V-belt drives, the positive tooth engagement eliminates slip, providing an exact speed ratio between driver and driven shafts.
The tooth profile (trapezoidal, curvilinear/HTD, or modified curvilinear/AT) determines load capacity, noise level, and positional accuracy. Selecting the correct tooth profile, pitch, and flange configuration is critical to drive performance and belt life.
Pitch
Distance between adjacent tooth centers, measured in mm (metric) or inches (imperial). Determines timing belt compatibility.
Pitch Diameter (PD)
The theoretical diameter at which belt pitch line runs. PD = (Number of Teeth × Pitch) ÷ π. Used for speed ratio calculation.
Tooth Profile
Trapezoidal (XL/L/H) for positioning; curvilinear HTD for high torque; AT-modified for high precision servo drives.
Flanged vs Unflanged
Flanges keep the belt tracking on the pulley. At least one pulley in each drive system should be flanged to prevent belt walk-off.
Timing Pulley – Key Anatomy
Cross-section showing key pulley dimensions
Which Timing Pulley Pitch Do You Need?
Selecting the wrong pitch standard is the most common ordering mistake. Use this quick guide to match your belt system.
XL
Extra LightLight load office equipment, small appliances, instruments. Trapezoidal tooth profile.
L
LightGeneral machinery, fans, pumps, light conveyor. Most common classical pitch. Trapezoidal.
H
HeavyMedium-heavy industrial machinery, compressors, machine tools. High belt width options.
XH
Extra HeavyHeavy industrial, construction equipment, high-torque main drives requiring wide belts.
T5
Metric T-SeriesEuropean standard metric drives, robotics, packaging. Trapezoidal. T2.5, T5, T10, T20 family.
HTD
High Torque DriveHigh-torque, high-speed drives. Curvilinear tooth. Servo motors, CNC, conveyors, robots.
AT
AT ModifiedHigh-precision positioning, servo systems. Modified trapezoidal for minimal backlash.
S-M
S-Series (Metric HTD)European variant of HTD curvilinear profile. Compatible with Gates PowerGrip GT belts in many cases.
Types of Timing Belt Pulleys
European Standard Timing Pulleys
Available in both metric and inch sizes, suitable for a wide range of industrial applications. These pulleys are designed to provide a positive press-fit to the shaft, minimizing sprocket wobble and ensuring smooth, efficient operation.
Timing Belt Pulleys with Pilot Bores
Engineered for versatile field modification and machining. Available in classical timing standards like XL, L, H, and XH series, with customizable teeth configurations ranging dynamically from 10 to 120 teeth.
Taper Bore Timing Pulleys
Designed to fit standard taper bushings for quick, secure mounting and easy shaft alignment. Available in premium industrial profile dimensions ranging from L to XH, with precision teeth counts up to 120.
Metric Pitch Timing Pulleys
We offer a highly comprehensive variety of metric pitch pulleys including T2.5, T5, T10, and T20 profiles, engineered to flawlessly match diverse high-accuracy belt width accommodations.
HTD Timing Belt Pulleys with Pilot Bores
Perfectly optimized to support curvilinear high-torque drive applications. Universally available across high-performance variations including the HTD 3M, 5M, 8M, 14M, and 20M series.
Timing Belt Pulley Types
Available globally across XL, L, H, and XH mechanical drive sizes, with an array of flexible hub integration systems including minimum plain bore, QD type, and taper bushed styles.
Special Categories
- Standard Toothed Bars for Timing Pulleys: We offer a wide range of standard toothed bars, which are essential components in creating custom pulleys for unique power transmission applications. These are precision-extruded and available in both metric and inch sizes.
- Metric Pitch Standard Toothed Bars: Available in optimized ST5 and ST10 structural configuration types, perfectly suitable for accommodating various specific drive belt widths.
- HTD Standard Toothed Bars: Offered in curvilinear high-torque HTD 3M and 5M profiles, excellent for precision localized prototyping or specialized component integration.
Timing Pulley Series चयन मार्गदर्शिका
Use this table to match your operating requirements to the correct timing pulley series.
Need help? Send your application data to [email protected].
| Series | Pitch | Tooth Profile | Torque Level | Positioning Accuracy | Typical Application |
|---|---|---|---|---|---|
| XL | 5.08mm | Trapezoidal | Low | Good | Office, medical, instruments |
| L | 9.525mm | Trapezoidal | Medium | Good | General machinery, fans, pumps |
| H | 12.70mm | Trapezoidal | High | Moderate | Compressors, conveyors, machine tools |
| XH | 22.225mm | Trapezoidal | Very High | Low | Heavy industrial, construction |
| T5 / T10 | 5 / 10mm | Trapezoidal | Medium | Good | European machinery, packaging, food |
| HTD 5M | 5mm | Curvilinear | High | Moderate | CNC, 3D printing, servo drives |
| HTD 8M | 8mm | Curvilinear | Very High | Moderate | Conveyors, heavy automation |
| HTD 14M | 14mm | Curvilinear | Extreme | Low | Mining, large industrial drives |
| AT5 / AT10 | 5 / 10mm | Modified Trap. | Medium-High | Excellent | Servo axes, precision positioning |
Timing Pulleys for Every Precision Drive
Synchronous drive reliability is critical across every sector. Our timing pulleys operate in the world's most demanding environments.
Our 5-StepOrder Process
Submit RFQ
Share series, tooth count, bore, material, and quantity. Drawings welcome.
Technical Review
Engineers confirm profile, pitch, bore compatibility and flag any spec risks.
Quote & Approve
Itemized quote with lead time and first-article (FA) sample plan returned in 24h.
Production & QC
CNC milling, boring, anodising/plating, and CMM inspection with records.
Ship with Docs
Export-packed with full inspection report, material cert, and customs papers.
Timing Pulley FAQs
What is the difference between HTD and classical trapezoidal timing pulleys?
HTD (High Torque Drive) pulleys feature a curvilinear tooth profile that distributes belt load more evenly, allowing significantly higher torque capacity than classical trapezoidal tooth profiles (XL, L, H, XH). HTD is preferred for high-torque servo, robotics, and industrial drives. Trapezoidal profiles offer better positional accuracy at light loads due to lower backlash.
What is a pilot bore timing pulley and when should I use it?
A pilot bore timing pulley is supplied with a small standard bore (typically 6mm or ¼”) for the customer to machine to their exact shaft diameter, keyway, and tolerance. Use pilot bore when you need flexibility across multiple shaft sizes from a single stock item, or when you require a specific bore tolerance (e.g. H7/h6 fit) that you will machine in-house.
What materials are available for timing pulleys?
Standard materials: Aluminium alloy 6061-T6 (lightweight, anodised for corrosion resistance — preferred for servo and robotics), Carbon steel 1045 (high strength, for heavy-duty industrial), Stainless steel 303/316 (food processing, medical, corrosive environments), POM (Delrin) and Nylon (light-duty, low noise). Material certificates supplied with all orders.
How do I specify a timing pulley? What information do you need?
For a complete quote, provide: (1) Series/pitch standard (e.g. HTD 5M, L, T10); (2) Number of teeth; (3) Belt width; (4) Bore type (pilot, finished, taper bore, QD); (5) Bore diameter and keyway if finished; (6) Material; (7) Flange requirement; (8) Quantity. A drawing or existing part number also helps us confirm quickly.
What timing pulley pitch standards do you manufacture?
We manufacture all major standards: Imperial classical (MXL, XL, L, H, XH, XXH), Metric T-series (T2.5, T5, T10, T20), HTD (3M, 5M, 8M, 14M, 20M), AT-series (AT3, AT5, AT10), and S-series (S2M, S3M, S5M, S8M). European standard in both metric and inch sizes. Custom profiles available on request.
Are HTD 5M and AT5 timing pulleys interchangeable?
No — despite having the same 5mm pitch, HTD 5M (curvilinear) and AT5 (modified trapezoidal) have different tooth profiles and are not interchangeable. Running an HTD belt on an AT5 pulley (or vice versa) causes premature tooth wear and belt failure. Always match belt and pulley tooth profiles from the same standard family.
Do you offer taper bore timing pulleys and which bushing sizes?
Yes. Taper bore timing pulleys are available in L to XH inch pitch and in HTD 8M and 14M metric series. Compatible bushing sizes range from 1008 to 3535 and are interchangeable with Dodge, Fenner, SKF, and other major taper lock brands. The self-centering taper ensures excellent concentricity without precision boring equipment on-site.
What surface treatments are available and for which applications?
Aluminium pulleys: clear or black anodising (8–15µm) for corrosion and wear resistance. Steel pulleys: black oxide, zinc electroplating, nickel plating, or phosphating depending on corrosion requirement. Stainless: typically supplied natural finish. For food-grade applications, anodised aluminium or 316 stainless with electropolish are recommended.