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Info:Tsubaki® 40B50 Plain Bore Type B Single Pitch Roller Chain Sprocket, 3/4 in Dia Bore, 8-1/4 in OD, #40 Chain, 50 Teeth, 1/2 in Pitch, Carbon Steel
Info:Martin 40B56 Type B Single Strand Welded Reboreable Roller Chain Sprocket, 3/4 to 2-3/8 in Dia Bore, 9.203 in OD, #40 Chain, 56 Teeth, 1/2 in Pitch, Steel
Info:Martin 40B57 Type B Single Strand Welded Reboreable Roller Chain Sprocket, 3/4 to 2-3/8 in Dia Bore, 9.363 in OD, #40 Chain, 57 Teeth, 1/2 in Pitch, Steel
Info:Martin 40B58 Type B Single Strand Welded Reboreable Roller Chain Sprocket, 3/4 to 2-3/8 in Dia Bore, 9.522 in OD, #40 Chain, 58 Teeth, 1/2 in Pitch, Steel