Tandem sprocket 12B z=19 for two simplex chains, width 45 mm, C45 steel, hardened teeth

Product Description

Tandem sprocket 12B z=19 for two simplex chains, width 45 mm, C45 steel, hardened teeth is a sprocket with two toothed rims for two simplex roller chains 12B-1 (DIN 8187 / ISO 606) with a pitch of 19.05 mm (3/4"). Each rim has 19 teeth, and the sprocket is made of C45 steel.

The rims are spaced 33.9 mm apart, so each chain runs on its own rim, independently of the other. The sprocket has no hub - the 16 mm pilot bore is reamed to the shaft size and completed with a keyway or a set screw hole. The teeth are hardened, so they withstand wear from the chain rollers better.

Technical data

Applications

It is used on intermediate shafts that receive the drive via one chain and pass it on via the other, as well as in drives that split the torque between two independent consumers.

Frequently asked questions

Which chain does this sprocket fit?

With two simplex roller chains 12B-1 to European standard DIN 8187 / ISO 606, with a pitch of 19.05 mm. Each chain runs on its own toothed rim.

What is the difference between a tandem sprocket and a duplex sprocket?

A tandem sprocket has two rims for two separate simplex chains 12B-1 - each chain runs on its own rim and can drive a different consumer. A duplex sprocket is designed for one duplex chain 12B-2, whose two rows of rollers are connected by common pins. That is why a duplex chain is not fitted on a tandem sprocket - the rims of this sprocket are spaced 33.9 mm apart, while the roller rows of the 12B-2 chain are 19.46 mm apart.

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.

How do I prepare the bore for mounting on the shaft?

The sprocket has a 16 mm pilot bore. It is reamed to the shaft diameter, and then a keyway or a set screw hole is made. During machining, keep the bore concentric with the rims so that both chains run without runout.

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 115.75 mm, and the outside diameter De is 124.2 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.