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HARFINGTON B Type Roller Chain Sprocket 20 Teeth 14mm Bore Stainless Steel Motor Drive Gear for Chain DIN/ISO No. 04C-1 and ANSI No. #25: Amazon.com: Industrial & Scientific
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Martin Roller Chain Sprocket, Bored-to-Size, Type B Hub, Single Strand, 35 Chain Size, 0.375" Pitch, 17 Teeth, 0.875" Bore Dia., 2.231" OD, 1.5938" Hub Dia., 0.168" Width: Amazon.com: Industrial & Scientific
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Jeremywell #40 Roller Chain Idler Sprocket 1/2" Bore Hardened 17 Tooth: Amazon.com: Industrial & Scientific
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