Made-to-Order Sprockets - Tsubaki

Sprocket TechnicalSectionTable 8 - Hub Diameter Selection TableAll dimensions are in inches unless otherwise specified.Standard Hub Diameters for Steel SprocketsAllowable Torque in Inch Pounds and Hub ClassBore of WheelSq. Key SizeSet Screw Size5001,0002,0003,5005,6008,50012,50017,00023,00030,000A B C D E F G H I J K L M N O P Q R S TDiameter of Keyseated Hubs38,00047,00060,00070,000100,000140,000190,000245,000325,000400,000500,000600,000720,000850,0001,000,0001,250,000U V W X Y ZMinimum Hubsfor Loose or Set-Screwed SprocketsDia.Lgth.Sprockets15⁄161⁄41 3 ⁄16 1⁄41 7 ⁄16 3⁄81 11 ⁄16 3⁄81 15 ⁄16 1⁄22 3 ⁄16 1⁄22 7 ⁄16 5⁄82 11 ⁄16 5⁄82 15 ⁄16 3⁄43 1 ⁄16 3⁄43 7 ⁄16 7⁄83 11 ⁄16 7⁄83 15 ⁄16 14 7 ⁄16 14 15 ⁄16 1 1 ⁄43⁄8 1 3 ⁄4 1 3 ⁄43⁄8 2 2 23⁄8 2 1 ⁄4 2 1 ⁄4 2 1 ⁄2 2 3 ⁄43⁄8 2 3 ⁄4 2 3 ⁄4 2 3 ⁄4 3 31⁄2 3 3 3 3 1 ⁄4 3 1 ⁄4 3 1 ⁄41⁄2 3 1 ⁄4 3 1 ⁄4 3 1 ⁄4 3 1 ⁄2 3 1 ⁄2 3 1 ⁄2 3 3 ⁄45⁄8 3 3 ⁄4 3 3 ⁄4 3 3 ⁄4 3 3 ⁄4 4 4 4 1 ⁄4 4 1 ⁄45⁄8 4 1 ⁄4 4 1 ⁄4 4 1 ⁄4 4 1 ⁄4 4 1 ⁄4 4 1 ⁄4 4 1 ⁄2 4 1 ⁄2 4 1 ⁄25⁄8 4 1 ⁄2 4 1 ⁄2 4 1 ⁄2 4 1 ⁄2 4 1 ⁄2 4 3 ⁄4 4 3 ⁄4 4 3 ⁄4 5 55⁄8 4 3 ⁄4 4 3 ⁄4 4 3 ⁄4 4 3 ⁄4 4 3 ⁄4 5 5 5 5 1 ⁄4 5 1 ⁄4 5 1 ⁄43⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄4 5 1 ⁄2 5 1 ⁄2 5 3 ⁄4 5 3 ⁄43⁄4 5 1 ⁄2 5 1 ⁄2 5 1 ⁄2 5 1 ⁄2 5 1 ⁄2 5 1 ⁄2 5 3 ⁄4 5 3 ⁄4 6 63⁄4 6 6 6 6 6 6 1 ⁄4 6 1 ⁄4 6 1 ⁄2 6 1 ⁄23⁄4 6 1 ⁄2 6 1 ⁄2 6 1 ⁄2 6 1 ⁄2 6 3 ⁄4 6 3 ⁄4 7 77⁄8 7 1 ⁄4 7 1 ⁄4 7 1 ⁄4 7 1 ⁄4 7 1 ⁄4 7 1 ⁄2 7 1 ⁄25 7 ⁄16 1 1 ⁄4 7⁄8 8 8 8 8 8 85 15 ⁄16 1 1 ⁄2 1 9 9 9 9 96 1 ⁄2 1 1 ⁄2 1 9 1 ⁄2 9 1 ⁄2 9 1 ⁄2 9 1 ⁄27 1 1 ⁄2 1 10 10 107 1 ⁄2 1 3 ⁄4 1 1 ⁄4 11 118 1 3 ⁄4 1 1 ⁄4 11 1 ⁄28 1 ⁄2 1 3 ⁄4 1 1 ⁄4 Chain and sprockets will9 1 3 ⁄4 1 1 ⁄4 not transmit full torque9 1 ⁄2 1 3 ⁄4 1 1 ⁄4value of shaft10 2 1 1 ⁄4LengthThroughBore*Hubs on one side only.1 1 *⁄4 1 1 *⁄2 1 3 ⁄4 2 2 1 ⁄2 2 3 ⁄4 3 1 ⁄4 3 1 ⁄2 4 4 1 ⁄4 4 1 ⁄2 5Notes1. The diagonal solid block of figures on the Hub DiameterSelection Table (Table 8) represent a condition of balancebetween torque and keyway with bore sizes. When the hubclass requirements and the bore size intersect in the blankspace below and to the left of the solid block, it indicates thatchain and sprocket will not transmit the full torque value ofthe keyed shaft. When the hub class and the bore sizeintersect above and to the right of the solid block, it indicatesChain and sprockets arestronger than shafts1 3 ⁄422 1 ⁄42 3 ⁄433 1 ⁄43 3 ⁄44 1 ⁄44 1 ⁄24 3 ⁄46 5 1 ⁄26 1 ⁄2 6 1 ⁄2 67 7 7 6 1 ⁄27 1 ⁄2 8 8 8 7 1 ⁄48 8 1 ⁄2 8 1 ⁄2 8 1 ⁄2 8 1 ⁄2 89 9 1 ⁄2 9 1 ⁄2 9 1 ⁄2 9 1 ⁄2 9 1 ⁄2 99 1 ⁄2 10 10 10 10 10 10 9 1 ⁄210 10 1 ⁄2 10 1 ⁄2 10 1 ⁄2 10 1 ⁄2 10 1 ⁄2 10 1 ⁄2 11 1011 11 1 ⁄2 11 1 ⁄2 11 1 ⁄2 11 1 ⁄2 11 1 ⁄2 11 1 ⁄2 12 12 1111 1 ⁄2 12 12 12 12 12 12 12 1 ⁄2 12 1 ⁄2 12 1 ⁄2 11 1 ⁄212 12 1 ⁄2 12 1 ⁄2 12 1 ⁄2 12 1 ⁄2 12 1 ⁄2 12 1 ⁄2 13 13 13 13 1 ⁄2 1213 13 13 13 13 13 13 1 ⁄2 13 1 ⁄2 13 1 ⁄2 14 14 1313 1 ⁄2 13 1 ⁄2 13 1 ⁄2 13 1 ⁄2 13 1 ⁄2 14 14 14 14 1 ⁄2 14 1 ⁄2 15 13 1 ⁄214 1 ⁄2 14 1 ⁄2 14 1 ⁄2 14 1 ⁄2 15 15 15 15 1 ⁄2 15 1 ⁄2 16 16 14 1 ⁄25 1 ⁄4 5 1 ⁄2 6 6 1 ⁄2 7 7 3 ⁄4 8 1 ⁄2 9 1 ⁄2 10 10 1 ⁄2 11 11 1 ⁄2 12 12 1 ⁄2that chain and sprocket are stronger than the keyed shaft. TheHub Diameter Selection Table also serves as a design checkon the shaft sizes as well.2. For loose-fitting sprockets only (no keyway or set screw),the minimum hub diameter and length are shown at theright end of the shaft size row and at the bottom of thehub class columns.5 1 ⁄4Length is determined same as for Key-seated SprocketsE-216