61-21 12B 3/4 BS Roller Chain Sprocket Taper Lock 2517 - Simplex - 21 Tooth

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61-21 12B 3/4 BS Roller Chain Sprocket Taper Lock 2517 - Simplex - 21 Tooth61 21 12B 3 4 Roller Chain Taper Lock Sprocket British Standard Roller Chain Sprocket to Suit 12B Chain. Part Number 61 21 Pitch 3 4 Boss Dia (mm) 90 Taper Bush 2517 Length inc boss (mm) 40 Teeth 21 PCD (mm) 127. 82 Nothing but 'Quality' Supplied

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