Sprocket 20B-1 z=21 with hub

Product Description

Sprocket 20B-1 z=21, with hub

Sprocket 20B-1 (pitch 1 1/4" - 31.75 mm), simplex, 21 teeth, with hub. The material is C45E carbon steel (EN 10083-1), and the teeth remain unhardened (without induction hardening) - in accordance with DIN 8187 / ISO 606; this version is easier to machine over the entire depth of the sprocket.

Technical data

Frequently asked questions

How does one duplex sprocket differ from two independent simplex sprockets on a common shaft?

A duplex sprocket is a single, monolithic toothed rim serving a duplex chain, in which both strands are mechanically integrated in one component. Two independent simplex sprockets on a common shaft serve two completely separate simplex chains - these solutions are not interchangeable without changing the chain type.

Does the machine's operating temperature matter when choosing the sprocket material?

Yes - at very low or very high temperatures the mechanical properties of steel or cast iron change, and lubricants may change viscosity or thicken. Under unusual thermal conditions (cold stores, furnaces, dryers), it is advisable to consult the supplier before selecting a specific material variant.

Does the difference in hardness between sprocket and chain affect their rate of wear?

Yes - chain and sprocket manufacturers select hardness so that they wear as evenly as possible, rather than one element "cutting down" the other. An excessively hard sprocket working with a soft, non-certified chain (or vice versa) leads to faster wear of the weaker element.

How can a sprocket and chain be protected against corrosion during storage?

After cleaning off any dirt, it is advisable to apply a layer of preservative grease or anti-corrosion oil and store the sprocket in a dry place not exposed to condensation. In the steel version (without coating), even a short damp break in the workshop can cause a rusty film on the tooth surfaces.

Where is this product used?

Typical applications of the 20B-1 sprocket: drives for pumps, mixers and industrial fans, as well as control systems for industrial gates and roller shutters, where resistance to continuous operation is required.

When placing your order, please check the current stock level of this gear - the lead time depends on it and is clearly stated according to the quantity available in the given warehouse.

Product photos are for illustrative purposes only.