Made-to-Order Sprockets - Tsubaki

Engineering ClassSprocket Part NumbersHow To Read… Engineering Class Sprocket Part Numbering SystemTsubaki’s engineering class sprocket part numbering system is standardized. Each letter and numberhas a significant meaning, and the order of these is critical to getting the right sprocket.Example: HSS81XC45F-50MMH SS 81X C 45 F- 50MMHSS81XCHardened (Heat Treated)Non Heat Treated would be SS81XC45F-50MMStainless SteelCarbon Steel material would be H81XC45F-50MMChain Size(or pitch for custom engineering class sprockets.Hub StyleA indicates A-Plate (no hub).B for B-Hub (hub on one side).C for C-Hub (hub on both sides).The hub letter may be replaced by another letter representing a bushing hub or a split taper hub,such as 81XR45 for an R1 split taper hub.45 Number of teethF- Finished BoreThis designates a finished bore with a keyway and two set screws. The dash after “F” is droppedif the bore diameter is less than 1”. Stock bore sprockets may either have a designation of “SB”,or no designation at all. Plain Bore sprockets use “PB” instead of “F”.50MMBore SizeMetric bore sizes are designated with “MM” after the metric dimension.Inch bore sizes are designated with the whole inch following by a letter. For example, a 1.5”diameter bore would be 1H.SprocketsE-13