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Info:Martin 40B47 Type B Single Strand Welded Reboreable Roller Chain Sprocket, 3/4 to 2-3/8 in Dia Bore, 7.769 in OD, #40 Chain, 47 Teeth, 1/2 in Pitch, Steel
Info:Browning® 1122530 Single Strand Minimum Bore Type B Roller Chain Sprocket With Hardened Teeth, 3/4 in Dia Bore, 7.93 in OD, #40 Chain, 48 Teeth, Steel
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