Sprocket 08A-1 (ANSI 40-1) z=21 with hub, C45 steel

Product Description

Sprocket 08A-1 (ANSI 40-1) z=21 with hub, C45 steel works with ASA 40 (08A-1) roller chain, single-strand (simplex), with a pitch of 12.7 mm (1/2"). It has 21 teeth and is made of C45 steel in accordance with ISO 606 and ANSI B29.1.

The sprocket has a one-sided hub with a diameter of 65 mm and a pilot bore of Ø12 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 28 mm.

Technical data

Applications

It is used in agricultural machinery, including seed drills, spreaders and grain conveyors.

Frequently asked questions

Which chain does this sprocket fit?

ASA 40-1 (08A-1) roller chain with a pitch of 12.7 mm. A simplex sprocket requires a single-strand (simplex) chain.

Does it fit 08B chain?

No. 08B chain (European standard) has the same pitch, but a different roller diameter (8.51 mm instead of 7.94 mm) and a different inner width (7.75 mm instead of 7.94 mm). The ASA 40 sprocket is designed for American-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 12.7 mm (1/2").

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 85.21 mm, and the outside diameter De is 91.77 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.

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.