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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 belt 824-8M-50, pitch 8M, width 50 mm, length 824 mm, 103 teeth, closed loop
ATTI • Code 062426 • CF HTD08240850
HTD belt 824-8M-50, pitch 8M, width 50 mm, length 824 mm, 103 teeth, closed loop
List price 82,11 € /pc.
Online 45,16 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 825-5M-09, pitch 5M, width 9 mm, length 825 mm, 165 teeth, closed loop
ATTI • Code 062427 • CF HTD08250509
HTD timing belt 825-5M-09, pitch 5M, width 9 mm, length 825 mm, 165 teeth, closed loop
List price 18,09 € /pc.
Online 9,95 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 825-5M-15, pitch 5M, width 15 mm, length 825 mm, 165 teeth, closed loop
ATTI • Code 062428 • CF HTD08250515
HTD timing belt 825-5M-15, pitch 5M, width 15 mm, length 825 mm, 165 teeth, closed loop
List price 30,14 € /pc.
Online 16,58 € /pc.
On Order
(Ship. 6-7 days)
HTD 835-5M-09 synchronous belt, pitch 5M, width 9 mm, length 835 mm, 167 teeth, closed loop
ATTI • Code 062430 • CF HTD08350509
HTD 835-5M-09 synchronous belt, pitch 5M, width 9 mm, length 835 mm, 167 teeth, closed loop
List price 18,17 € /pc.
Online 9,99 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 835-5M-15, pitch 5M, width 15 mm, length 835 mm, 167 teeth, closed loop
ATTI • Code 062431 • CF HTD08350515
HTD belt 835-5M-15, pitch 5M, width 15 mm, length 835 mm, 167 teeth, closed loop
List price 30,26 € /pc.
Online 16,65 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 835-5M-25, pitch 5M, width 25 mm, length 835 mm, 167 teeth, closed loop
ATTI • Code 062432 • CF HTD08350525
HTD toothed belt 835-5M-25, pitch 5M, width 25 mm, length 835 mm, 167 teeth, closed loop
List price 50,44 € /pc.
Online 27,74 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 840-8M-20, pitch 8M, width 20 mm, length 840 mm, 105 teeth, closed loop
ATTI • Code 062433 • CF HTD08400820
HTD belt 840-8M-20, pitch 8M, width 20 mm, length 840 mm, 105 teeth, closed loop
List price 33,51 € /pc.
Online 18,43 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 840-8M-30, pitch 8M, width 30 mm, development 840 mm, 105 teeth, closed loop
ATTI • Code 062434 • CF HTD08400830
HTD timing belt 840-8M-30, pitch 8M, width 30 mm, development 840 mm, 105 teeth, closed loop
List price 50,26 € /pc.
Online 27,65 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 840-8M-50, pitch 8M, width 50 mm, circumference 840 mm, 105 teeth, closed loop
ATTI • Code 062435 • CF HTD08400850
HTD timing belt 840-8M-50, pitch 8M, width 50 mm, circumference 840 mm, 105 teeth, closed loop
List price 83,77 € /pc.
Online 46,07 € /pc.
On Order
(Ship. 6-7 days)
HTD synchronous belt 840-8M-85, pitch 8M, width 85 mm, length 840 mm, 105 teeth, closed loop
ATTI • Code 062436 • CF HTD08400885
HTD synchronous belt 840-8M-85, pitch 8M, width 85 mm, length 840 mm, 105 teeth, closed loop
List price 142,42 € /pc.
Online 78,33 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 843-3M-06, pitch 3M, width 6 mm, length 843 mm, 281 teeth, closed loop
ATTI • Code 062437 • CF HTD08430306
HTD timing belt 843-3M-06, pitch 3M, width 6 mm, length 843 mm, 281 teeth, closed loop
List price 13,06 € /pc.
Online 7,18 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 843-3M-09, pitch 3M, width 9 mm, length 843 mm, 281 teeth, closed loop
ATTI • Code 062438 • CF HTD08430309
HTD timing belt 843-3M-09, pitch 3M, width 9 mm, length 843 mm, 281 teeth, closed loop
List price 19,59 € /pc.
Online 10,78 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 843-3M-15, pitch 3M, width 15 mm, length 813 mm, 271 teeth, closed loop
ATTI • Code 062439 • CF HTD08430315
HTD belt 843-3M-15, pitch 3M, width 15 mm, length 813 mm, 271 teeth, closed loop
List price 32,65 € /pc.
Online 17,96 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 848-8M-30, pitch 8M, width 30 mm, length 848 mm, 106 teeth, closed loop
ATTI • Code 062440 • CF HTD08480830
HTD timing belt 848-8M-30, pitch 8M, width 30 mm, length 848 mm, 106 teeth, closed loop
List price 50,84 € /pc.
Online 27,96 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 850-5M-15, pitch 5M, width 15 mm, length 850 mm, 170 teeth, closed loop
ATTI • Code 062441 • CF HTD08500515
HTD timing belt 850-5M-15, pitch 5M, width 15 mm, length 850 mm, 170 teeth, closed loop
List price 30,89 € /pc.
Online 16,99 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 850-5M-25, pitch 5M, width 25 mm, length 850 mm, 170 teeth, closed loop
ATTI • Code 062442 • CF HTD08500525
HTD toothed belt 850-5M-25, pitch 5M, width 25 mm, length 850 mm, 170 teeth, closed loop
List price 51,49 € /pc.
Online 28,32 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 856-8M-20, pitch 8M, width 20 mm, length 856 mm, 107 teeth, closed loop
ATTI • Code 062443 • CF HTD08560820
HTD timing belt 856-8M-20, pitch 8M, width 20 mm, length 856 mm, 107 teeth, closed loop
List price 34,15 € /pc.
Online 18,78 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 856-8M-30, pitch 8M, width 30 mm, length 856 mm, 107 teeth, closed loop
ATTI • Code 062444 • CF HTD08560830
HTD timing belt 856-8M-30, pitch 8M, width 30 mm, length 856 mm, 107 teeth, closed loop
List price 51,22 € /pc.
Online 28,17 € /pc.
On Order
(Ship. 6-7 days)
HTD 856-8M-50 timing belt, pitch 8M, width 50 mm, length 856 mm, 107 teeth, closed loop
ATTI • Code 062445 • CF HTD08560850
HTD 856-8M-50 timing belt, pitch 8M, width 50 mm, length 856 mm, 107 teeth, closed loop
List price 85,36 € /pc.
Online 46,95 € /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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A.T.T.I. Srl - Via f.lli Cervi 3 - 20063 Cernusco sul Naviglio (MI) - IT
P.IVA 05984490150 | Codice SDI: A4707H7 | Rea: MI-1062427 | Capitale Sociale: 100.000,00 €