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STD S8M Taper Lock Timing Pulleys

STD S8M Taper Lock timing pulleys are the basic type of pulleys for STD (Super Torque Drive) belts for Taper bush.

They are made of steel or gray cast iron.

The pulleys are mounted to the shafts using the Taper bushes. The Taper bush does not only secure the pulley on the shaft with a keyway but also fixes it against axial displacement.


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Pulleys Fields of Use

The STD S8M Taper timing pulleys are designed for all types of STD belts with pitch 8.00 mm.

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 must be balanced even at v < 30 m/s.

Pulley Code Description

30 - S08M - 20 TB (2012)
30 - teeth, S08M - profile, tooth pitch, 20 - belts width, TB (2012) - Taper bush

Documents for Download

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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