Poly-V pulley PJ 56/12, 12 grooves, cast iron, pilot bore

Product Description

Poly-V pulley PJ 56/12, 12 grooves, cast iron, pilot bore is a pulley for PJ poly-V (multi-rib) belts: diameter 56 mm, 12 grooves, groove pitch 2.34 mm. It is made of EN-GJL-200 cast iron, phosphated and statically balanced for a peripheral speed of up to 30 m/s.

The pulley has a hub with a pilot bore, which is bored out to the shaft size and completed with a keyway.

Technical data

Applications

Drives with high ratios and small pulley diameters: woodworking machines, compressors, presses and fitness equipment.

Frequently asked questions

Which poly-V pulley has the PJ profile, a diameter of 56 mm and 12 grooves?

This is the poly-V pulley PJ 56/12, 12 grooves, cast iron, pilot bore.

Which belt fits this pulley?

A PJ poly-V (multi-rib) belt to ISO 9982 / DIN 7867 with a rib pitch of 2.34 mm and up to 12 ribs, e.g. 12PJ... (the belt length is chosen to suit the centre distance). A narrower belt of the same profile will also run.

How does a poly-V belt differ from a V-belt?

A poly-V belt is thin and flexible, so it runs on small diameter pulleys and allows a high ratio in a single stage. One wide belt replaces several V-belts, runs more quietly and has less slip.

How do I prepare the bore for the shaft?

The pilot bore is bored out on a lathe to the shaft size (usually to tolerance H7) and a keyway is cut to DIN 6885. The pulley is secured axially with a set screw or a retaining ring.

How do I calculate the belt speed on this pulley?

Belt speed v = π × d × n / 60 000, where d is the pulley diameter in mm and n is the speed in rpm. On this pulley at 1450 rpm the belt runs at approx. 4.3 m/s. The pulley is statically balanced up to 30 m/s.

What does the lead time depend on?

When ordering, please check the current stock level of this pulley - the lead time depends on it and is clearly stated according to the quantity available in each warehouse. The stock level is shown above the product price and may differ between warehouses.

Product photos are for illustration purposes only.