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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 timing belt 350-5M-25, pitch 5M, width 25 mm, length 350 mm, 70 teeth, endless loop
ATTI • Code 039207 • CF HTD03500525
HTD timing belt 350-5M-25, pitch 5M, width 25 mm, length 350 mm, 70 teeth, endless loop
List price 22,22 € /pc.
Online 12,22 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 375-5M-25, pitch 5M, width 25 mm, length 375 mm, 75 teeth, closed loop
ATTI • Code 039208 • CF HTD03750525
HTD timing belt 375-5M-25, pitch 5M, width 25 mm, length 375 mm, 75 teeth, closed loop
List price 23,76 € /pc.
Online 13,07 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 400-5M-25, pitch 5M, width 25 mm, length 400 mm, 80 teeth, closed loop
ATTI • Code 039209 • CF HTD04000525
HTD toothed belt 400-5M-25, pitch 5M, width 25 mm, length 400 mm, 80 teeth, closed loop
List price 25,96 € /pc.
Online 14,28 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 425-5M-25, pitch 5M, width 25 mm, length 425 mm, 85 teeth, closed loop
ATTI • Code 039210 • CF HTD04250525
HTD timing belt 425-5M-25, pitch 5M, width 25 mm, length 425 mm, 85 teeth, closed loop
List price 27,52 € /pc.
Online 15,14 € /pc.
On Order
(Ship. 6-7 days)
HTD synchronous belt 450-5M-25, pitch 5M, width 25 mm, length 450 mm, 90 teeth, closed loop
ATTI • Code 039211 • CF HTD04500525
HTD synchronous belt 450-5M-25, pitch 5M, width 25 mm, length 450 mm, 90 teeth, closed loop
List price 28,24 € /pc.
Online 15,53 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 475-5M-25, pitch 5M, width 25 mm, length 475 mm, 95 teeth, closed ring
ATTI • Code 039212 • CF HTD04750525
HTD timing belt 475-5M-25, pitch 5M, width 25 mm, length 475 mm, 95 teeth, closed ring
List price 29,48 € /pc.
Online 16,21 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 500-5M-25, pitch 5M, width 25 mm, length 500 mm, 100 teeth, closed loop
ATTI • Code 039213 • CF HTD05000525
HTD timing belt 500-5M-25, pitch 5M, width 25 mm, length 500 mm, 100 teeth, closed loop
List price 30,84 € /pc.
Online 16,96 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 525-5M-25, pitch 5M, width 25 mm, length 525 mm, 105 teeth, closed loop
ATTI • Code 039214 • CF HTD05250525
HTD timing belt 525-5M-25, pitch 5M, width 25 mm, length 525 mm, 105 teeth, closed loop
List price 32,40 € /pc.
Online 17,82 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 550-5M-25, pitch 5M, width 25 mm, length 550 mm, 110 teeth, endless loop
ATTI • Code 039215 • CF HTD05500525
HTD timing belt 550-5M-25, pitch 5M, width 25 mm, length 550 mm, 110 teeth, endless loop
List price 33,97 € /pc.
Online 18,68 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 560-5M-25, pitch 5M, width 25 mm, development 560 mm, 112 teeth, closed loop
ATTI • Code 039216 • CF HTD05600525
HTD timing belt 560-5M-25, pitch 5M, width 25 mm, development 560 mm, 112 teeth, closed loop
List price 34,65 € /pc.
Online 19,06 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 600-5M-25, pitch 5M, width 25 mm, length 600 mm, 120 teeth, closed loop
ATTI • Code 039218 • CF HTD06000525
HTD belt 600-5M-25, pitch 5M, width 25 mm, length 600 mm, 120 teeth, closed loop
List price 37,43 € /pc.
Online 20,59 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 635-5M-25, pitch 5M, width 25 mm, length 635 mm, 127 teeth, closed loop
ATTI • Code 039219 • CF HTD06350525
HTD timing belt 635-5M-25, pitch 5M, width 25 mm, length 635 mm, 127 teeth, closed loop
List price 39,61 € /pc.
Online 21,79 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 670-5M-25, pitch 5M, width 25 mm, length 670 mm, 134 teeth, closed loop
ATTI • Code 039220 • CF HTD06700525
HTD toothed belt 670-5M-25, pitch 5M, width 25 mm, length 670 mm, 134 teeth, closed loop
List price 41,77 € /pc.
Online 22,97 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 700-5M-25, pitch 5M, width 25 mm, length 700 mm, 140 teeth, closed loop
ATTI • Code 039221 • CF HTD07000525
HTD timing belt 700-5M-25, pitch 5M, width 25 mm, length 700 mm, 140 teeth, closed loop
List price 43,74 € /pc.
Online 24,05 € /pc.
On Order
(Ship. 6-7 days)
HTD belt 750-5M-25, pitch 5M, width 25 mm, length 750 mm, 150 teeth, closed loop
ATTI • Code 039222 • CF HTD07500525
HTD belt 750-5M-25, pitch 5M, width 25 mm, length 750 mm, 150 teeth, closed loop
List price 46,89 € /pc.
Online 25,79 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 800-5M-25, pitch 5M, width 25 mm, length 800 mm, 160 teeth, endless loop
ATTI • Code 039223 • CF HTD08000525
HTD timing belt 800-5M-25, pitch 5M, width 25 mm, length 800 mm, 160 teeth, endless loop
List price 50,04 € /pc.
Online 27,52 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 860-5M-25, pitch 5M, width 25 mm, length 860 mm, 172 teeth, closed loop
ATTI • Code 039224 • CF HTD08600525
HTD toothed belt 860-5M-25, pitch 5M, width 25 mm, length 860 mm, 172 teeth, closed loop
List price 51,58 € /pc.
Online 28,37 € /pc.
On Order
(Ship. 6-7 days)
HTD toothed belt 900-5M-25, pitch 5M, width 25 mm, length 900 mm, 180 teeth, looped
ATTI • Code 039225 • CF HTD09000525
HTD toothed belt 900-5M-25, pitch 5M, width 25 mm, length 900 mm, 180 teeth, looped
List price 53,39 € /pc.
Online 29,36 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 950-5M-25, pitch 5M, width 25 mm, length 950 mm, 190 teeth, closed loop
ATTI • Code 039226 • CF HTD09500525
HTD timing belt 950-5M-25, pitch 5M, width 25 mm, length 950 mm, 190 teeth, closed loop
List price 55,81 € /pc.
Online 30,69 € /pc.
On Order
(Ship. 6-7 days)
HTD timing belt 1050-5M-25, pitch 5M, width 25 mm, length 1050 mm, 210 teeth, closed loop
ATTI • Code 039229 • CF HTD10500525
HTD timing belt 1050-5M-25, pitch 5M, width 25 mm, length 1050 mm, 210 teeth, closed loop
List price 61,46 € /pc.
Online 33,81 € /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 €