Sprocket 12B-2 (3/4") z=68 with hub, steel

Product Description

Sprocket 12B-2 (3/4") z=68 with hub, steel 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 68 teeth and is made of steel.

The sprocket has a hub with a pilot bore, which is bored to the shaft size and completed with a keyway or a set screw hole.

Technical data

Applications

It is used in agricultural machinery, including seed drills, spreaders and grain conveyors. The double-strand version carries higher loads than a single-strand one of the same pitch.

Frequently asked questions

Which chain does the 12B-2 z=68 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 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.

How do I check the pitch of a sprocket?

The sprocket pitch matches the chain pitch - it is the distance between the centres of adjacent teeth measured on the pitch circle. The easiest way to check it is to place a section of matching chain on the sprocket: it should sit on the teeth without tension. This sprocket has a pitch of 19.05 mm (3/4").

How is the pitch diameter of a sprocket calculated?

The pitch diameter Dp is the circle along which the chain rollers travel. It is calculated with the formula: pitch divided by the sine of (180° / number of teeth). For this sprocket it is 412.49 mm.

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.