A
Plain
Teeth across the full width and no hub. The simplest, lightest pulley for compact drives.
Base order data only
Timing Belt Pulley Manufacturer in Ahmedabad
Pulleys
A pulley that matches your belt exactly
Size tables for timing belt pulleys in imperial, metric T and AT, HTD and STS profiles, with pitch, belt widths and tooth depth. Pilot, finished or taper lock bore, in aluminium, steel, stainless steel or cast iron.
A timing belt pulley, also called a toothed or synchronous pulley, must match its belt in pitch, tooth form and width. Use the tables below to check the pitch and common belt widths for your profile, then tell us the number of teeth, the bore and the flange arrangement.
For how we machine timing pulleys, the materials we use and custom work, see our timing pulleys made to drawing. To size the belt, use our belt length calculator.
- Since 1997
- Made to drawing
- Made in Ahmedabad
Download the timing pulley cataloguePDF, 18 pages, 1.7 MB
At a glance
- Imperial
- MXL, XL, L, H, XH, XXH
- Metric
- T2.5 to T20, AT3 to AT20
- HTD and STS
- 3M to 14M, S3M to S14M
- Bores
- Unbored, pilot bore, taper lock or finished bore
- Materials
- Aluminium, mild steel, stainless steel, cast iron, Delrin, nylon and EN series steels
- Types
- Single sided, double sided, flanged or plain
Size tables
Timing belt pulley size tables by profile
Choose a profile family. "PCD less OD" is how much smaller the outside diameter is than the pitch diameter.
Classical trapezoidal, to ISO
Imperial: MXL to XXH
Classical inch pitch pulleys made to ISO standards.
| Profile | Pitch | PCD less OD | Common belt widths | Tooth depth |
|---|---|---|---|---|
| MXL | 2.032 mm (0.080 in) | 0.51 mm | 3, 6, 9.5 mm | 0.457 mm |
| XL | 5.080 mm (0.200 in) | 0.51 mm | On request | 1.651 mm |
| L | 9.525 mm (0.375 in) | 0.75 mm | 12.5, 19, 25.4 mm | 2.667 mm |
| H | 12.700 mm (0.500 in) | 1.37 mm | 1, 1.5, 2 in | 3.048 mm |
| XH | 22.225 mm (0.875 in) | 2.79 mm | 2, 3, 4 in | 7.137 mm |
| XXH | 31.750 mm (1.250 in) | 3.05 mm | 2, 3, 4, 5 in | 10.312 mm |
Metric trapezoidal
Metric T: T2.5 to T20
Metric pitch pulleys for zero backlash and efficient power transfer.
| Profile | Pitch | PCD less OD | Common belt widths | Tooth depth |
|---|---|---|---|---|
| T2.5 | 2.5 mm | 0.51 mm | 4, 6, 10 mm | 0.75 to 1.00 mm |
| T5 | 5 mm | 0.85 mm | 6, 10, 16, 25 mm | 1.25 to 1.95 mm |
| T10 | 10 mm | 1.90 mm | 16, 25, 32, 50 mm | 2.60 to 3.40 mm |
| T20 | 20 mm | 2.90 to 3.2 mm | 16, 25, 32, 50, 75, 100 mm | 5.20 to 6.30 mm |
Reinforced metric trapezoidal
AT: AT3 to AT20
A stronger metric tooth for higher loads and accurate positioning.
| Profile | Pitch | PCD less OD | Common belt widths |
|---|---|---|---|
| AT3 | 3 mm | 0.42 mm | 6, 10, 16, 25, 32 mm |
| AT5 | 5 mm | 1.20 mm | 10, 12, 25 mm |
| AT10 | 10 mm | 1.85 mm | 10, 16, 25, 32, 50, 75, 100 mm |
| AT20 | 20 mm | 2.90 to 3.2 mm | 16, 25, 32, 50, 75, 100 mm |
Curvilinear, high torque
HTD: 3M to 14M
Curvilinear teeth for high torque drives.
| Profile | Pitch | PCD less OD | Common belt widths |
|---|---|---|---|
| 3M | 3 mm | 0.75 mm | 6, 9 mm |
| 5M | 5 mm | 1.15 mm | 9, 15 mm |
| 8M | 8 mm | 1.37 mm | 20, 30, 50, 85 mm |
| 14M | 14 mm | 2.80 mm | 40, 55, 85, 115, 170 mm |
Parabolic, super torque
STS: S3M to S14M
Parabolic tooth geometry for higher load carrying capacity.
| Profile | Pitch | PCD less OD | Common belt widths | Tooth depth |
|---|---|---|---|---|
| S3M | 3 mm | 0.76 mm | 6, 10, 15 mm | 1.14 mm |
| S4.5M | 4.5 mm | 0.76 mm | 6, 10, 15 mm | 1.59 to 1.68 mm |
| S5M | 5 mm | 0.96 mm | 10, 15 mm | 1.77 mm |
| S8M | 8 mm | 1.37 mm | 15, 25, 40, 60 mm | 2.83 to 3.03 mm |
| S14M | 14 mm | 2.80 mm | 40, 60, 80, 100, 120 mm | 4.95 to 5.23 mm |
Pitch diameter (PCD) = number of teeth × pitch ÷ π. The outside diameter is the PCD less the value in the table.
Types
Types of timing belt pulleys
-
Classical (imperial)
MXL to XXH pulleys for inch pitch belts on existing machinery.
-
Metric T and AT
Metric pitch pulleys for T and AT belts, with zero backlash.
-
HTD and STS
Curvilinear and parabolic teeth for higher torque in less width.
-
Double sided
Teeth on both sides of the belt for drives that reverse direction across several shafts.
-
Pilot bore and taper lock
Bore it yourself, or fit it fast with a taper lock bush.
-
Custom
Made to your drawing for special pitches, flanges and hubs.
Materials
Materials for timing belt pulleys
-
Aluminium
Light with low inertia, so drives start and stop quickly.
Best for: general machinery
-
Mild steel
Tough and economical, machined from bar for most industrial parts.
Best for: general duty
-
EN series steels
Carbon and alloy steels, hardened where needed for high torque and wear.
Best for: high load
-
Stainless steel
Resists corrosion where machines are washed down or run wet.
Best for: food and pharma
-
Cast iron
Stable and economical for large diameter, heavy duty parts.
Best for: large diameters
-
Delrin and nylon
Quiet and light, with no lubrication needed.
Best for: light, quiet drives
Ordering
How to specify a timing belt pulley
-
Belt profile and pitch
Read the belt code, or measure across 10 teeth.
-
Number of teeth
The tooth count sets the pitch diameter and speed ratio.
-
Belt width
Face width is the belt width plus flange clearance.
-
Bore and flanges
Pilot, finished or taper lock bore, flanged or plain.
Pulley types
Eight timing pulley types, from A to CFH
A, B and C describe the body; F adds flanges and H adds a hub. Every order needs the teeth, pitch, tooth width, bore, keyway, tapping and material, and each type adds the sizes shown.
-
-
AF
Plain, flanged
Type A with a flange on each side to keep the belt on the pulley.
+ Face width
-
B
With hub
A hub on one side gives a longer bore and room for the grub screw.
+ Hub diameter, Hub length
-
BF
With hub, flanged
Type B with flanges, the usual choice for the flanged pulley in a drive.
+ Face width, Hub diameter, Hub length
-
C
Counter-bored
Both faces recessed to cut weight. Used for larger diameters.
+ Hub diameter, Counter diameter, Counter width
-
CF
Counter-bored, flanged
Type C with flanges, for large flanged pulleys.
+ Face width, Hub diameter, Counter diameter, Counter width
-
CH
Counter-bored with hub
Type C with a hub for a longer bore on large pulleys.
+ Hub diameter, Hub length, Counter diameter, Counter width
-
CFH
Counter-bored, flanged, with hub
Type C with both flanges and a hub.
+ Face width, Hub diameter, Hub length, Counter diameter, Counter width
- Tooth width Always wider than the belt.
- Face width Flanged types: tooth width + 5 mm (two 1.5 mm flanges plus 1 mm each for spinning).
- Total width Types with a hub: tooth or face width + hub length.
- Bore A size and fit such as 20 H7, or a pilot bore (PB) to finish yourself.
Industries
Where our timing belt pulleys run
FAQ
Timing belt pulleys: common questions
Quick answers for maintenance and purchase teams.
Yes. Both names describe a toothed pulley that drives a timing belt without slip. It is also called a synchronous or toothed pulley. For profiles, materials and custom work, see our timing pulleys page.
Pitch diameter = number of teeth × pitch ÷ π. The outside diameter is slightly smaller than the pitch diameter, by the value given in the size tables.
The face width is the belt width plus a little clearance for the flanges. Tell us the belt width and we machine the face to suit.
Usually at least one pulley in the drive is flanged on both sides to stop the belt running off. On vertical shafts and long centre distances, flange both pulleys.
Unbored, pilot bore, taper lock bore, or a finished bore with keyway and grub screw holes to your shaft size.
Related products
-
Flagship -
-
-
