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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 255-5M-09, pitch 5M, width 9 mm, length 255 mm, 51 teeth, closed loop
ATTI • Code 039137 • CF HTD02550509
HTD belt 255-5M-09, pitch 5M, width 9 mm, length 255 mm, 51 teeth, closed loop
List price 5,86 € /pc.
Online 3,22 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 280-5M-09, pitch 5M, width 9 mm, length 280 mm, 56 teeth, closed loop
ATTI • Code 039138 • CF HTD02800509
HTD timing belt 280-5M-09, pitch 5M, width 9 mm, length 280 mm, 56 teeth, closed loop
List price 6,42 € /pc.
Online 3,53 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 300-5M-09, pitch 5M, width 9 mm, length 300 mm, 60 teeth, closed loop
ATTI • Code 039139 • CF HTD03000509
HTD timing belt 300-5M-09, pitch 5M, width 9 mm, length 300 mm, 60 teeth, closed loop
List price 6,89 € /pc.
Online 3,79 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 305-5M-09, pitch 5M, width 9 mm, length 305 mm, 61 teeth, closed-loop
ATTI • Code 039140 • CF HTD03050509
HTD timing belt 305-5M-09, pitch 5M, width 9 mm, length 305 mm, 61 teeth, closed-loop
List price 6,96 € /pc.
Online 3,83 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 325-5M-09, pitch 5M, width 9 mm, length 325 mm, 65 teeth, closed loop
ATTI • Code 039141 • CF HTD03250509
HTD toothed belt 325-5M-09, pitch 5M, width 9 mm, length 325 mm, 65 teeth, closed loop
List price 7,46 € /pc.
Online 4,10 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 340-5M-09, pitch 5M, width 9 mm, length 340 mm, 68 teeth, closed loop
ATTI • Code 039142 • CF HTD03400509
HTD timing belt 340-5M-09, pitch 5M, width 9 mm, length 340 mm, 68 teeth, closed loop
List price 7,79 € /pc.
Online 4,29 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 350-5M-09, pitch 5M, width 9 mm, length 350 mm, 70 teeth, closed loop
ATTI • Code 039143 • CF HTD03500509
HTD timing belt 350-5M-09, pitch 5M, width 9 mm, length 350 mm, 70 teeth, closed loop
List price 7,99 € /pc.
Online 4,40 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 375-5M-09, pitch 5M, width 9 mm, length 375 mm, 75 teeth, closed loop
ATTI • Code 039144 • CF HTD03750509
HTD timing belt 375-5M-09, pitch 5M, width 9 mm, length 375 mm, 75 teeth, closed loop
List price 8,56 € /pc.
Online 4,71 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 400-5M-09, pitch 5M, width 9 mm, length 400 mm, 80 teeth, closed loop
ATTI • Code 039145 • CF HTD04000509
HTD belt 400-5M-09, pitch 5M, width 9 mm, length 400 mm, 80 teeth, closed loop
List price 9,36 € /pc.
Online 5,15 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 475-5M-09, pitch 5M, width 9 mm, length 475 mm, 95 teeth, closed loop
ATTI • Code 039146 • CF HTD04750509
HTD timing belt 475-5M-09, pitch 5M, width 9 mm, length 475 mm, 95 teeth, closed loop
List price 10,61 € /pc.
Online 5,84 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 500-5M-09, pitch 5M, width 9 mm, length 500 mm, 100 teeth, endless loop
ATTI • Code 039147 • CF HTD05000509
HTD toothed belt 500-5M-09, pitch 5M, width 9 mm, length 500 mm, 100 teeth, endless loop
List price 11,10 € /pc.
Online 6,11 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 525-5M-09, pitch 5M, width 9 mm, length 525 mm, 105 teeth, closed loop
ATTI • Code 039148 • CF HTD05250509
HTD timing belt 525-5M-09, pitch 5M, width 9 mm, length 525 mm, 105 teeth, closed loop
List price 11,66 € /pc.
Online 6,42 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 550-5M-09, pitch 5M, width 9 mm, length 550 mm, 110 teeth, closed loop
ATTI • Code 039149 • CF HTD05500509
HTD timing belt 550-5M-09, pitch 5M, width 9 mm, length 550 mm, 110 teeth, closed loop
List price 12,23 € /pc.
Online 6,73 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 560-5M-09, pitch 5M, width 9 mm, length 560 mm, 112 teeth, closed loop
ATTI • Code 039150 • CF HTD05600509
HTD timing belt 560-5M-09, pitch 5M, width 9 mm, length 560 mm, 112 teeth, closed loop
List price 12,48 € /pc.
Online 6,86 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 600-5M-09, pitch 5M, width 9 mm, length 600 mm, 120 teeth, closed loop
ATTI • Code 039152 • CF HTD06000509
HTD toothed belt 600-5M-09, pitch 5M, width 9 mm, length 600 mm, 120 teeth, closed loop
List price 13,48 € /pc.
Online 7,42 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 635-5M-09, pitch 5M, width 9 mm, length 635 mm, 127 teeth, closed loop
ATTI • Code 039153 • CF HTD06350509
HTD timing belt 635-5M-09, pitch 5M, width 9 mm, length 635 mm, 127 teeth, closed loop
List price 14,26 € /pc.
Online 7,84 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 670-5M-09, pitch 5M, width 9 mm, length 670 mm, 134 teeth, closed loop
ATTI • Code 039154 • CF HTD06700509
HTD timing belt 670-5M-09, pitch 5M, width 9 mm, length 670 mm, 134 teeth, closed loop
List price 15,04 € /pc.
Online 8,27 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 700-5M-09, pitch 5M, width 9 mm, length 700 mm, 140 teeth, looped
ATTI • Code 039155 • CF HTD07000509
HTD timing belt 700-5M-09, pitch 5M, width 9 mm, length 700 mm, 140 teeth, looped
List price 15,74 € /pc.
Online 8,66 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 750-5M-09, pitch 5M, width 9 mm, length 750 mm, 150 teeth, closed loop
ATTI • Code 039156 • CF HTD07500509
HTD timing belt 750-5M-09, pitch 5M, width 9 mm, length 750 mm, 150 teeth, closed loop
List price 16,88 € /pc.
Online 9,28 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 800-5M-09, pitch 5M, width 9 mm, length 800 mm, 160 teeth, closed loop
ATTI • Code 039157 • CF HTD08000509
HTD timing belt 800-5M-09, pitch 5M, width 9 mm, length 800 mm, 160 teeth, closed loop
List price 18,03 € /pc.
Online 9,92 € /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 €