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STD Standard Pilot Bore Timing Pulleys

STD Standard standard timing pulleys are the basic type of pulleys for STD (Super Torque Drive) belts.

They are made of steel or gray cast iron as unbored or with a pilot bore.

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


Tooth pitch: 8.0 mm
Teeth z = 22 - 192
Diameters Dp (mm): 45.84 - 488.92


Tooth pich: 14.0 mm
Teeth z = 28 - 144
Stand. diameters Dp (mm): 124.78 - 641.71

Pulleys Fields of Use

The STD standard timing pulleys are designed for all types of STD belts.

They are typically used in high-speed machine tools, compressors, packaging, printing and textile machines and in many other machines.

They are also typically used in machines from Asia, especially Japan.

Pulleys Material

Steel or cast iron.

Other materials to order.

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


Cast iron pulleys at v < 30 m/s must be balanced.

Pulleys Basic Profile

  • Pulley S3M for belts STD S3M with pitch 3.00 mm - to custom
  • Pulley S5M for belts STD S5M with pitch 5.00 mm - to custom
  • Pulley S8M for belts STD S8M with pitch 8.00 mm
  • Pulley S14M for belts STD S14M with pitch 14.00 mm

Pulleys Code Description

30-S8M-20 (Type 6F)

Code Part Description

Number of pulley teeth


Teeth pitch in mm and profile of pulleys for belts STD


Width of belt in mm


Type of construction

Documents for Download

Dimensions and Parameters of STD Standard Pilot Bore Timing Pulleys - Preview

Dimensions and Parameters of STD Standard Pilot Bore Timing Pulleys

TYMA CZ Data Sheets

Czech and English (PDF 1.19 MB)

Pulleys and Clamping Bushes - Preview

Pulleys and Clamping Bushes

TYMA CZ Catalogue

Czech and English (PDF 3.64 MB)

Manufacturer Profile

logo SIT

The group SIT S.p.A develops, engineers, manufactures and distributes high quality solutions and components for power transmission for industrial applications of excellence worldwide, with the aim of increasing the productivity of its customers’ machines and systems. With operations on 3 continents, SIT manufactures pulleys, rubber and polyurethane belts, drive couplings, locking assemblies and a wide range of accessories.

SIT belongs to a large industrial group that dates as far back as 1838. Today, thanks to over 50 years of specific experience in power transmission and a close-knit team of highly qualified professionals, the Group engages in constant technological innovation in order to offer the best application solutions in mechanical power drives.

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