Finer PT 20B1-21T/L Taper Lock Sprocket – 20B-1 Simplex – 1-1/4″ Pitch – 21 Teeth – 2517 Bush

The Finer PT 20B1-21T/L is a 21 tooth taper lock sprocket for 20B-1 simplex British Standard roller chain – 1-1/4″ (31.75mm) pitch. It has a 213mm pitch circle diameter (PCD) and a 228mm outside diameter. It is bored to take a 2517 taper lock bush.

Taper lock sprockets locate on the shaft through a separate tapered bush. The bush carries the shaft bore and keyway – so one sprocket suits a range of shaft sizes – pulls up concentric as the screws are tightened and comes off cleanly for maintenance. All Finer sprockets are engineered in accordance with ISO 9000 standards.

Dimensions:

• Hub diameter (dm): 140 mm
• Overall length (A): 55 mm
• Tooth width (B1): 18.5 mm
• Tooth radius (r3): 32 mm
• Radius width (C): 3.5 mm
• Construction type: Type 1 as drawn on the spec sheet
• Chain: 1-1/4″ (31.75 mm) pitch – 19.56 mm inside width – 19.05 mm roller diameter

BS / ASA interchange (1-1/4″ pitch – BS 20B-1 and ASA 100-1): ASA sprockets will wrap BS chain – BS sprockets may need to have the teeth skimmed to run on ASA chain – the plate thickness differs.

Please note: this sprocket is bored to take a 2517 taper lock bush – the bush is not included. When requesting a quote – include your shaft size so the matching bush can be supplied.

Downloads:

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

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