uxcell 24 Tooth Roller Sprocket B Type, 25 Chain, Single Strand 1/4" Pitch, 19mm Bore Black Oxide C45 Carbon Steel, Keyway with Set Screws for ISO 04C: Amazon.com: Industrial & Scientific
The Ultimate Guide to Roller Chain Sprockets - Dimensions & Types
Martin Roller Chain Sprocket, Hardened Teeth, Idler, Type B Hub, Single Strand, 80 Chain Size, 1" Pitch, 13 Teeth, 1" Bore Dia., 4.66" OD, 2.63" Hub Dia., 0.575" Width: Amazon.com: Industrial &
Martin Roller Chain Sprocket, Reboreable, Type A Hub, Double Single Strand, 40 Chain Size, 0.5" Pitch, 20 Teeth, 0.625" Bore Dia., 3.46" OD, 2.625" Hub Dia., 1.40625" Width: Amazon.com: Industrial & Scientific