Sprocket 05B-2 z=21 with hub, C45 steel

Product Description

Sprocket 05B-2 z=21 with hub, C45 steel is designed for 05B-2 roller chain (European standard DIN 8187 / ISO 606), double-strand (duplex), with a pitch of 8 mm. It has 21 teeth and is made of C45 steel.

The sprocket has a one-sided hub with a diameter of 40 mm and a pilot bore of Ø10 mm, which is bored to the shaft size and completed with a keyway or a set screw hole. The total width of the sprocket is 20 mm.

Technical data

Applications

It suits go-karts, recreational vehicles and small garden machinery. The double-strand version carries higher loads than a single-strand one of the same pitch.

Frequently asked questions

Which chain does the 05B-2 z=21 sprocket fit?

05B-2 roller chain to European standard DIN 8187 / ISO 606, with a pitch of 8 mm. A duplex sprocket requires a double-strand (duplex) chain.

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 53.67 mm, and the outside diameter De is 57 mm.

When should I choose a sprocket with hub and when a plate wheel?

A sprocket with hub is chosen when it transmits torque directly from the shaft via a key - the hub provides a longer contact surface with the shaft and a more stable fit. Plate wheels are used mainly when the wheel is fixed to an existing flange or drum, or when there is little space on the shaft.

How does the number of teeth affect the drive ratio?

The ratio is the number of teeth of the driven wheel divided by the number of teeth of the driving wheel. If this sprocket drives a wheel with twice as many teeth, the driven shaft turns twice as slowly but with roughly twice the torque.

Why does the sprocket have a pilot bore and how is it machined?

The pilot bore Ø10 mm is left on purpose so that it can be bored precisely to the machine shaft size. The sprocket is clamped in a lathe by the outer edge of the hub to avoid run-out, and the bore is usually machined to H7 tolerance. The maximum bore diameter depends on the hub diameter.

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.