Sprocket 04A-1 (25-1) z=30 with hub

Product Description

Sprocket 04A-1 (25-1) z=30 with hub is designed for ASA 25 (04A-1 / 04C-1) roller chain, single-strand (simplex), with a pitch of 6.35 mm (1/4"). It has 30 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 30.0 mm and a pilot bore of Ø8 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 16 mm.

Technical data

Applications

It works well in light drives: packaging machines, labelling machines and small conveyors.

Frequently asked questions

Which chain does this sprocket fit?

ASA 25-1 (04A-1) roller chain with a pitch of 6.35 mm. The same chain is also designated 04C-1. A simplex sprocket requires a single-strand (simplex) chain.

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

The pilot bore of Ø8 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 (30.0 mm).

How is a keyway cut in the hub?

The keyway is made to DIN 6885, keeping it aligned and with the correct width and depth so that the key sits firmly. The key should fit accurately - play in the keyway accelerates wear and, under shock loads, can lead to the key shearing off.

What is the set screw hole in the hub for?

The threaded hole, usually made above the keyway or at 90° to it, takes a headless set screw. It prevents the sprocket from sliding along the shaft when the machine vibrates.

Can a sprocket with hub be welded to the shaft?

Technically it is possible, but we do not recommend it. Welding overheats the material, can bend the shaft and damage nearby bearings, and makes later replacement of a worn sprocket very difficult. It is better to fix the sprocket with a key.

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.