Finer PT 24B2-21PB Pilot Bore Sprocket – 24B-2 Duplex – 1-1/2″ Pitch – 21 Teeth

The Finer PT 24B2-21PB is a 21 tooth pilot bore sprocket for 24B-2 duplex British Standard roller chain – 1-1/2″ (38.1mm) pitch. It has a 255.65mm pitch circle diameter (PCD) and a 270.6mm outside diameter. It comes with a 25mm pilot bore.

A pilot bore sprocket is supplied with a small starter bore so it can be machined out to suit the shaft – keyway and set screws. Finer sprockets are made from high quality steel with induction hardened teeth – improving resistance to wear and extending working life. All Finer sprockets are engineered in accordance with ISO 9000 standards.

Dimensions:

• Hub diameter (dm): 160 mm
• Overall length (A): 100 mm
• Tooth width (B2): 72 mm
• Tooth radius (r3): 38 mm
• Radius width (C): 4 mm
• Approx. weight: 26.99 kg
• Chain: 1-1/2″ (38.1 mm) pitch – 25.4 mm inside width – 25.4 mm roller diameter

BS / ASA interchange (1-1/2″ pitch – BS 24B-1 and ASA 120-1): BS sprockets will wrap ASA chain (not recommended for frequent forward/reverse indexing) but ASA sprockets may need to have the teeth skimmed to wrap BS chain – the plate thickness differs.

Please note: this pilot bore sprocket is supplied with a 25mm pilot bore – it is not finish bored.

Downloads:

• Finer PT 20B and 24B Pilot Bore Sprockets Spec Sheet (PDF)
• Finer PT Sprockets BS / ASA Interchange Chart (PDF)

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