Finer PT 40A1-21PB Pilot Bore Sprocket – ASA 40-1 Simplex – 1/2″ Pitch – 21 Teeth

The Finer PT 40A1-21PB is a 21 tooth pilot bore sprocket for ASA 40-1 simplex roller chain – 1/2″ (12.7mm) pitch. It has an 85.22mm pitch circle diameter (PCD) and a 91.3mm outside diameter. It comes with a 14mm 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): 68 mm
• Overall length (A): 28 mm
• Tooth width (B1): 7.2 mm
• Tooth radius (r3): 13.5 mm
• Radius width (C): 1.6 mm
• Approx. weight: 0.82 kg
• Chain: 1/2″ (12.7 mm) pitch – 7.94 mm inside width – 7.94 mm roller diameter

BS / ASA interchange (1/2″ pitch – BS 08B-1 and ASA 40-1): BS sprockets will wrap ASA chain but ASA sprockets will not wrap BS chain – the roller diameters differ.

Please note: this pilot bore sprocket is supplied with a 14mm pilot bore – it is not finish bored.

Downloads:

• Finer PT ASA 40 Pilot Bore Sprockets Spec Sheet (PDF)
• Finer PT Sprockets BS / ASA Interchange Chart (PDF)

Supplied by Finer Power Transmissions.