Sprocket 28B-1 z=27 with hub

Product Description

Sprocket 28B-1 z=27, with hub

The sprocket 28B-1 shown is a simplex sprocket with 27 teeth, made with a hub, for chain with a pitch of 1 3/4" / 44.45 mm. The sprocket complies with DIN 8187 / ISO 606 and is made of C45E steel (EN 10083-1); the teeth are not hardened, which lowers the cost of the sprocket and makes it easier to machine (e.g. deep boring of the hub) throughout the entire volume of the material.

Technical data

Frequently asked questions

Can a sprocket be welded directly to the drive shaft?

Technically this is possible, but we strongly advise against such a solution. Welding overheats the material, damages nearby bearings, bends the shaft and prevents the worn sprocket from being easily replaced later. Always use mounting with a key or a clamping bush.

How does rotational speed affect the selection of the minimum number of teeth of a sprocket in the system?

At higher rotational speeds, a larger minimum number of teeth on the smallest sprocket in the system is recommended to reduce chain vibration and impacts resulting from the so-called polygon effect. With very small sprockets (e.g. 9-11 teeth) and high speeds, wear and vibration levels increase significantly faster than with larger sprockets.

How does the choice of the number of teeth affect vibration levels and drive operation?

A smaller number of teeth means fewer meshing points per revolution and larger fluctuations in the instantaneous chain speed (the so-called polygon effect), which results in higher vibration levels. Increasing the number of teeth of the sprocket (at the same pitch) smooths the operation of the drive, although it increases its overall dimensions.

Does a sprocket with hub have a fixed mounting side, or can it be reversed?

The sprocket is usually symmetrical with respect to the plane of the rim, so the rim itself cannot be "reversed incorrectly" - but the hub is usually on only one side of the sprocket, which determines which way the sprocket must be mounted relative to other components on the shaft (e.g. bearings, other sprockets).

Where is this product used?

28B-1 sprockets operate in drives of construction machinery, goods lifts, aggregate conveyors and woodworking machines - wherever tooth durability under load matters.

When placing your order, please check the current stock level of this gear - the lead time depends on it and is clearly stated according to the quantity available in the given warehouse.

Product photos are for illustrative purposes only.