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Toothed Belts

Metrical pitch AT, T, HTD / Inch pitch L, XL, H, XH, XXH

The synchronous belts ensure quiet, efficient, and slip-free power transmission, thanks to the toothed profile that meshes perfectly with pulleys of the same pitch. 

They are ideal for applications requiring positioning precision, reliability, and long life even in heavy-duty working conditions. They reduce maintenance and improve energy efficiency, making them perfect for machine tools, industrial automation, handling, and any application requiring reliable and precise transmission.

Available in a wide range of versions, they include:

  • Metric T, AT, and HTD synchronous belts for high precision standard applications and high power transmissions.
  • Inch XL, L, H, XH, and XXH synchronous belts, compatible with American standard machinery (imperial pitch).
  • Reinforced options with steel or Kevlar core for superior performance.

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HTD 312-3M-15 timing belt, 3M pitch, 15 mm width, 312 mm length, 104 teeth, closed loop
ATTI • Code 062246 • CF HTD03120315
HTD 312-3M-15 timing belt, 3M pitch, 15 mm width, 312 mm length, 104 teeth, closed loop
List price 12,92 € /pc.
Online 7,11 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 318-3M-06, pitch 3M, width 6 mm, length 318 mm, 106 teeth, closed loop
ATTI • Code 062247 • CF HTD03180306
HTD timing belt 318-3M-06, pitch 3M, width 6 mm, length 318 mm, 106 teeth, closed loop
List price 5,26 € /pc.
Online 2,89 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 318-3M-09, pitch 3M, width 9 mm, length 318 mm, 106 teeth, closed loop
ATTI • Code 062248 • CF HTD03180309
HTD timing belt 318-3M-09, pitch 3M, width 9 mm, length 318 mm, 106 teeth, closed loop
List price 7,88 € /pc.
Online 4,34 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 318-3M-12, pitch 3M, width 12 mm, length 318 mm, 106 teeth, closed loop
ATTI • Code 062249 • CF HTD03180312
HTD timing belt 318-3M-12, pitch 3M, width 12 mm, length 318 mm, 106 teeth, closed loop
List price 10,50 € /pc.
Online 5,78 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 318-3M-15, pitch 3M, width 15 mm, length 318 mm, 106 teeth, closed in a loop
ATTI • Code 062250 • CF HTD03180315
HTD timing belt 318-3M-15, pitch 3M, width 15 mm, length 318 mm, 106 teeth, closed in a loop
List price 13,14 € /pc.
Online 7,22 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 330-3M-06, pitch 3M, width 6 mm, length 330 mm, 110 teeth, closed loop
ATTI • Code 062251 • CF HTD03300306
HTD toothed belt 330-3M-06, pitch 3M, width 6 mm, length 330 mm, 110 teeth, closed loop
List price 5,47 € /pc.
Online 3,01 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 330-3M-12, pitch 3M, width 12 mm, length 330 mm, 110 teeth, closed loop
ATTI • Code 062252 • CF HTD03300312
HTD timing belt 330-3M-12, pitch 3M, width 12 mm, length 330 mm, 110 teeth, closed loop
List price 10,95 € /pc.
Online 6,02 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 330-5M-15, pitch 5M, width 15 mm, length 330 mm, 66 teeth, closed loop
ATTI • Code 062253 • CF HTD03300515
HTD timing belt 330-5M-15, pitch 5M, width 15 mm, length 330 mm, 66 teeth, closed loop
List price 12,60 € /pc.
Online 6,93 € /pc.
On Order
(Ship. 6-7 days)
HTD 333-3M-03 timing belt, pitch 3M, width 3 mm, development 333 mm, 111 teeth, closed loop
ATTI • Code 062254 • CF HTD03330303
HTD 333-3M-03 timing belt, pitch 3M, width 3 mm, development 333 mm, 111 teeth, closed loop
List price 2,76 € /pc.
Online 1,52 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 333-3M-09, pitch 3M, width 9 mm, length 333 mm, 111 teeth, closed loop
ATTI • Code 062255 • CF HTD03330309
HTD timing belt 333-3M-09, pitch 3M, width 9 mm, length 333 mm, 111 teeth, closed loop
List price 8,27 € /pc.
Online 4,55 € /pc.
On Order
(Ship. 6-7 days)
HTD 333-3M-15 toothed belt, pitch 3M, width 15 mm, length 333 mm, 111 teeth, closed loop
ATTI • Code 062256 • CF HTD03330315
HTD 333-3M-15 toothed belt, pitch 3M, width 15 mm, length 333 mm, 111 teeth, closed loop
List price 13,78 € /pc.
Online 7,58 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 336-3M-03, pitch 3M, width 3 mm, length 336 mm, 112 teeth, closed loop
ATTI • Code 062257 • CF HTD03360303
HTD timing belt 336-3M-03, pitch 3M, width 3 mm, length 336 mm, 112 teeth, closed loop
List price 2,78 € /pc.
Online 1,53 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 336-3M-06, pitch 3M, width 6 mm, length 336 mm, 112 teeth, closed loop
ATTI • Code 062258 • CF HTD03360306
HTD timing belt 336-3M-06, pitch 3M, width 6 mm, length 336 mm, 112 teeth, closed loop
List price 5,57 € /pc.
Online 3,06 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 336-3M-09, pitch 3M, width 9 mm, length 336 mm, 112 teeth, closed loop
ATTI • Code 062259 • CF HTD03360309
HTD timing belt 336-3M-09, pitch 3M, width 9 mm, length 336 mm, 112 teeth, closed loop
List price 8,34 € /pc.
Online 4,59 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 336-3M-15, pitch 3M, width 15 mm, length 336 mm, 112 teeth, closed loop
ATTI • Code 062260 • CF HTD03360315
HTD timing belt 336-3M-15, pitch 3M, width 15 mm, length 336 mm, 112 teeth, closed loop
List price 13,90 € /pc.
Online 7,64 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 339-3M-03, pitch 3M, width 3 mm, length 339 mm, 113 teeth, closed loop
ATTI • Code 062261 • CF HTD03390303
HTD belt 339-3M-03, pitch 3M, width 3 mm, length 339 mm, 113 teeth, closed loop
List price 2,80 € /pc.
Online 1,54 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 339-3M-06, pitch 3M, width 6 mm, length 339 mm, 113 teeth, closed loop
ATTI • Code 062262 • CF HTD03390306
HTD timing belt 339-3M-06, pitch 3M, width 6 mm, length 339 mm, 113 teeth, closed loop
List price 5,61 € /pc.
Online 3,09 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 339-3M-09, pitch 3M, width 9 mm, length 339 mm, 113 teeth, closed loop
ATTI • Code 062263 • CF HTD03390309
HTD timing belt 339-3M-09, pitch 3M, width 9 mm, length 339 mm, 113 teeth, closed loop
List price 8,40 € /pc.
Online 4,62 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 339-3M-12, pitch 3M, width 12 mm, length 339 mm, 113 teeth, closed loop
ATTI • Code 062264 • CF HTD03390312
HTD belt 339-3M-12, pitch 3M, width 12 mm, length 339 mm, 113 teeth, closed loop
List price 11,21 € /pc.
Online 6,17 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 339-3M-15, pitch 3M, width 15 mm, length 339 mm, 113 teeth, closed loop
ATTI • Code 062265 • CF HTD03390315
HTD timing belt 339-3M-15, pitch 3M, width 15 mm, length 339 mm, 113 teeth, closed loop
List price 14,00 € /pc.
Online 7,70 € /pc.
On Order
(Ship. 6-7 days)

Frequently asked questions

How is the code of an HTD timing belt read (e.g., 365-5M-15)?

The code of an HTD timing belt indicates the length, pitch of the teeth, and width of the belt.

Taking 365-5M-15 as an example:

  • 365: belt length in millimeters.
  • 5M: tooth pitch of 5 mm, with HTD profile.
  • 15: belt width in millimeters.

To calculate the number of teeth, simply divide the length by the pitch: 365 ÷ 5 = 73 teeth.

On shop.atti.it, ATTI offers over 4,200 timing belts, in HTD pitches of 3M, 5M, 8M, and 14M and in metric profiles.

What is the difference between HTD, T, and AT timing belts?

The HTD, T, and AT timing belts are primarily distinguished by their tooth profile and transmission characteristics.

  • HTD (3M, 5M, 8M, 14M): have rounded teeth and are particularly suitable for transmitting high torque.
  • T (T2.5, T5, T10): have trapezoidal teeth and a metric pitch. They are widely used in handling and positioning applications.
  • AT: have an enhanced trapezoidal profile compared to T belts and allow for greater force transmission at the same width.

Note: the belt and the pulley must have the same profile and the same pitch. Different types are therefore not directly interchangeable.

To choose the most suitable belt, it is important to verify the transmission characteristics and compatibility with the pulleys used.

What are the Gates Poly Chain Carbon belts and when are they used?

The Gates Poly Chain Carbon are polyurethane toothed belts with carbon fiber tensile cords, designed to transmit very high torque.

They are used in industrial applications that require robust and efficient drives and can be an alternative to traditional roller chains.

Compared to chains, they offer several advantages:

  • No lubrication is required.
  • They have a very low elongation during operation.
  • They allow the creation of drives suitable for high loads.

Caution: the Gates Poly Chain Carbon require pulleys with a dedicated profile and are not directly interchangeable with standard HTD toothed belts.

On shop.atti.it, ATTI offers over 250 codes from this range, including the Mini Poly Chain version.

Can open timing belts be purchased by the meter?

Yes. ATTI offers open timing belts by the meter in polyurethane, primarily used for linear shafts, conveyor belts, and positioning systems.

The belts can be ordered by the meter, with a minimum quantity of 5 meters.

In these applications, the ends of the belt are generally secured using special locking plates, available for the main pitches of the timing belts.

To identify the most suitable product, it is important to check the profile, pitch, and width of the belt.

Where to buy V-Belts Gates online in Italy?

On shop.atti.it, the e-commerce site of ATTI Srl, you can find V-Belts Gates from the Hi-Power and Delta Classic lines, as well as belts branded ATTI.

The catalog includes V-Belts of various types:

  • Classic sections: Z, A, B, C, D, E.
  • Narrow sections: SPZ, SPA, SPB, SPC.
  • Notched sections: AX, BX, XPZ, XPA, XPB, XPC.

On shop.atti.it, there are over 3,300 items in the V-Belts category, available for online purchase with shipping throughout Italy.

You can consult the available range in the V-Belts category.

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