Sprocket 12B-1 (3/4") z=20 with hub, C45 steel, hardened teeth

Product Description

Sprocket 12B-1 (3/4") z=20 with hub, C45 steel, hardened teeth is designed for 12B-1 roller chain (European standard DIN 8187 / ISO 606), single-strand (simplex), with a pitch of 19.05 mm (3/4"). It has 20 teeth and is made of C45 steel. The teeth are induction hardened to 45-55 HRC, so they withstand wear from the chain rollers better. The hub is not hardened, so the bore can easily be machined to the shaft size.

The sprocket has a one-sided hub with a diameter of 80 mm and a pilot bore of Ø16 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 35 mm.

Technical data

Applications

It works in food and packaging industry machinery and in internal transport equipment.

Frequently asked questions

Which chain does the 12B-1 z=20 sprocket fit?

12B-1 roller chain to European standard DIN 8187 / ISO 606, with a pitch of 19.05 mm. A simplex sprocket requires a single-strand (simplex) chain.

Does hardening make machining the hub bore difficult?

No. Only the teeth are induction hardened (45-55 HRC); the hub remains unhardened. The bore can be machined to the shaft size and fitted with a keyway or a set screw hole.

Does it fit ASA 60 chain?

No. ASA 60 chain (American standard) has the same pitch, but a different roller diameter (11.91 mm instead of 12.07 mm) and a different inner width (12.7 mm instead of 11.68 mm). The 12B sprocket is designed for European-standard chain, so the two systems should not be mixed.

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.

How should sprockets be aligned during installation?

The driving and driven sprockets must lie in one plane. Alignment can be checked with a long steel straightedge placed against the sides of both wheels or with a laser alignment tool. Even a small misalignment wears the sides of the teeth and speeds up chain wear.

When does a sprocket need replacing?

It should be replaced when the teeth start to look like pointed shark fins or are clearly bent to one side. Running on such a profile quickly destroys even a new chain, so a worn sprocket must be replaced.

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.