Tandem sprocket 12B z=20 for two simplex chains, for Taper-Lock bush 2517, C45 steel

Product Description

Tandem sprocket 12B z=20 for two simplex chains, for Taper-Lock bush 2517, C45 steel drives two simplex roller chains 12B-1 to DIN 8187 / ISO 606 at the same time, with a pitch of 19.05 mm (3/4"). It has two rims with 20 teeth each and 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 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 (up to 65 mm). The bush is not included - the 2517 bush can be purchased separately from our range.

Technical data

Applications

It is found in two-track conveyors, production lines and machines in which two simplex chains have to run at the same speed on one shaft.

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 choose the bush for this sprocket?

The sprocket has a seat for a Taper-Lock 2517 bush, so you need a bush with the same number. It is chosen with a bore that matches the shaft diameter - a 2517 bush accepts bores up to 65 mm. Before ordering, it is worth measuring the shaft carefully with a caliper in several places.

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 121.78 mm, and the outside diameter De is 129.7 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.