Sprocket 20B-1 (1 1/4") z=19 with hub, bore 45 mm with keyway, C45 steel

Product Description

Sprocket 20B-1 (1 1/4") z=19 with hub, bore 45 mm with keyway, C45 steel is designed for 20B-1 roller chain (European standard DIN 8187 / ISO 606), single-strand (simplex), with a pitch of 31.75 mm (1 1/4"). It has 19 teeth and is made of C45 steel.

The sprocket has a hub with a finished bore of 45 mm and a keyway, so it can be fitted straight onto a shaft of this diameter - without boring the hole or cutting a keyway. The hub diameter is 120 mm and the total width of the sprocket is 50 mm.

Technical data

Applications

It is found in transmissions of industrial machinery that transfer high torque.

Frequently asked questions

Which chain does the 20B-1 z=19 sprocket fit?

20B-1 roller chain to European standard DIN 8187 / ISO 606, with a pitch of 31.75 mm. A simplex sprocket requires a single-strand (simplex) chain.

Which shaft does this sprocket fit?

The sprocket has a finished bore of 45 mm with a keyway, so it is mounted on a 45 mm shaft with a key. Before ordering, it is worth measuring the shaft carefully with a caliper in several places.

Does it fit ASA 100 chain?

No. ASA 100 chain (American standard) has the same pitch and roller diameter, but a different inner width (19.05 mm instead of 19.56 mm). The 20B sprocket is designed for European-standard chain, so the two systems should not be mixed.

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 31.75 mm (1 1/4").

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 192.91 mm, and the outside diameter De is 208.1 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.