Sprocket 12B-2 z=21 for Taper-Lock bush 2517

Product Description

Sprocket 12B-2 z=21 for Taper-Lock bush 2517 fits 12B-2 roller chain (European standard DIN 8187 / ISO 606), double-strand (duplex), with a pitch of 19.05 mm (3/4"). It has 21 teeth and is made of C45 steel.

The sprocket has a seat for a Taper-Lock 2517 clamping bush, so it can be mounted on the shaft without boring the hole or cutting a keyway in the sprocket - simply choose a 2517 bush with a bore that matches the shaft. The hub diameter is 108 mm and the total width of the sprocket is 45 mm. The bush is not included - the 2517 bush can be purchased separately from our range.

Technical data

Applications

It works in chain transmissions of industrial machinery where easy sprocket replacement is important. The double-strand version carries higher loads than a single-strand one of the same pitch.

Frequently asked questions

Which chain does this sprocket fit?

12B-2 roller chain to European standard DIN 8187 / ISO 606, with a pitch of 19.05 mm. A duplex sprocket requires a double-strand (duplex) chain.

Does it fit ASA 60 chain?

No. ASA 60 chain (American standard) has the same pitch, but a different roller diameter (11.91 mm instead of 12.07 mm) and a different inner width (12.7 mm instead of 11.68 mm). The 12B sprocket is designed for European-standard chain, so the two systems should not be mixed.

When does a sprocket need replacing?

When the teeth start to look like pointed shark fins or are clearly bent to one side. Running on such a profile quickly destroys even a new chain, so a worn sprocket must be replaced. Thanks to the Taper-Lock bush, replacement is quick.

Can a new chain be fitted on a worn sprocket?

This should not be done. A worn sprocket has a changed tooth profile, so a new chain runs unevenly and elongates quickly. The rule is: new chain - new sprockets.

When are multi-strand sprockets used?

Double- and triple-strand sprockets work with multi-strand chains in heavily loaded drives where there is no room for a chain with a larger pitch. Several strands share the load evenly, which reduces wear and the risk of chain breakage.

What does the lead time depend on?

When ordering, please check the current stock level of this sprocket - 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 vary depending on the warehouse.

Product photos are for illustration purposes only.