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AT Pilot Bore Timing Pulleys for Polyurethane Belts

AT timing pulleys are the basic type of pulleys for polyurethane belts with a trapezoidal AT profile. They are made from aluminium alloy as unbored or with a pre-drilled hole.

The pulleys are supplied as a semi-finished product and the bore must be modified before mounting the pulleys on the shafts.

AT5 Pilot Bore Timing Pulleys for Polyurethane Belts - Preview


Tooth pitch: 5.0 mm
Teeth z = 10 - 60
Stand. diameters De (mm): 14.65 - 94.25
AT10 Pilot Bore Timing Pulleys for Polyurethane Belts - Preview


Tooth pitch: 10.0 mm
Teeth z = 12 - 60
Stand. diameters De (mm): 36.35 - 189.10
AT20 Pilot Bore Timing Pulleys for Polyurethane Belts - Preview


Tooth pitch: 20.0 mm
Teeth z = 12 - 72
Stand. diameters De (mm): 111.75 - 455.50

Pulleys Fields of Use

AT timing pulleys are designed for all types of AT polyurethane belts.

They are typically used in machine tools, packaging machines, printers, single-purpose machines, in the food, paper and glass industry and many other industries.

Pulleys Material

Aluminum alloy.

Other materials to order.

The design for Taper Lock housings must be custom made, aluminum alloy must not be used, but steel must be used.

Parameter Standard
Surface roughness ISO 254
Balance quality grade VDI 2060, ISO 1940

Pulleys Code Description

31 AT10/24-2 (Type 6F, Al Alloy)

Code Part Description

Total width of pulley in mm (for belts 16AT10 - belt width of 16 mm)




Number of pulley teeth


Number of side rails


Type of construction

Al Alloy

Pulley material


The catalog data sheets serve only as a recommendation for the types and dimensions of aluminum alloy pulleys for standard widths and numbers of teeth. All AT20 pulleys are custom made only.

Timing pulleys in the AT versions can also be made to order in the "SE" reduced backlash version and the "0 backlash" / "0-Lücke" version with zero backlash.

Documents for Download

Pulleys and Clamping Bushes - Preview

Pulleys and Clamping Bushes

TYMA CZ Catalogue

Czech and English (PDF 3.64 MB)

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