Inner Ring (IR) On The Timken Company

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Ideal choice where the shaft is not practical to use as inner raceway.
Designed to meet established inch tolerances.
Maximum shaft fillet radius cannot exceed inner-ring bore chamfer as shown.
Optional centralized lubrication groove (bore) or through hole available – specify when ordering.
Designed to be axially clamped against shoulder for loose transition fit on shaft.
After mounting, for tight transition fit (keeping inner ring from rotating relative to shaft), inner-ring O.D. must not exceed raceway diameter on matching bearing.
After mounting, if O.D. of inner ring exceeds the required raceway diameter for matching bearing, ring should be ground to proper diameter while mounted on shaft.
Unmarked end of inner ring to be assembled against the shaft shoulder to ensure clearing the maximum allowable shaft fillet as indicated in tables shown.

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Shaft Diameter (in)

Part Number	Shaft Diameter	Dimension D	Dimension F	Dimension B	Max. Loose Transition Fit S	CAD

IR-506032	N/A 3.125 in	N/A 3.125 in79.375 mm	N/A 3.7500 in95.250 mm	N/A 2 in50.8 mm	N/A 3.1246 in79.365 mm	N/A
IR-526032	N/A 3.25 in	N/A 3.250 in82.55 mm	N/A 3.7500 in95.250 mm	N/A 2 in50.8 mm	N/A 3.2495 in82.537 mm	N/A
IR-526432	N/A 3.25 in	N/A 3.250 in82.55 mm	N/A 4 in101.600 mm	N/A 2 in50.8 mm	N/A 3.2495 in82.537 mm	N/A
IR-546432	N/A 3.375 in	N/A 3.375 in85.725 mm	N/A 4 in101.600 mm	N/A 2 in50.8 mm	N/A 3.3745 in85.712 mm	N/A
IR-566432	N/A 3.50 in	N/A 3.500 in88.9 mm	N/A 4 in101.600 mm	N/A 2 in50.8 mm	N/A 3.4995 in88.887 mm	N/A
IR-566832	N/A 3.50 in	N/A 3.500 in88.9 mm	N/A 4.25 in107.95 mm	N/A 2 in50.8 mm	N/A 3.4995 in88.887 mm	N/A
IR-606832	N/A 3.750 in	N/A 3.750 in95.25 mm	N/A 4.25 in107.95 mm	N/A 2 in50.8 mm	N/A 3.7495 in95.237 mm	N/A
IR-607236	N/A 3.750 in	N/A 3.750 in95.25 mm	N/A 4.5000 in114.300 mm	N/A 2.2500 in57.150 mm	N/A 3.7495 in95.237 mm	N/A
IR-607240	N/A 3.750 in	N/A 3.750 in95.25 mm	N/A 4.5000 in114.300 mm	N/A 2.5000 in63.500 mm	N/A 3.7495 in95.237 mm	N/A
IR-648036	N/A 4 in	N/A 4.000 in101.6 mm	N/A 5 in127 mm	N/A 2.2500 in57.150 mm	N/A 3.9995 in101.587 mm	N/A
IR-648040	N/A 4 in	N/A 4.000 in101.6 mm	N/A 5 in127 mm	N/A 2.5000 in63.500 mm	N/A 3.9995 in101.587 mm	N/A
IR-688036	N/A 4.25 in	N/A 4.250 in107.95 mm	N/A 5 in127 mm	N/A 2.2500 in57.150 mm	N/A 4.2495 in107.937 mm	N/A
IR-728840	N/A 4.50 in	N/A 4.500 in114.3 mm	N/A 5.5000 in139.700 mm	N/A 2.5000 in63.500 mm	N/A 4.4995 in114.287 mm	N/A
IR-728848	N/A 4.50 in	N/A 4.500 in114.3 mm	N/A 5.5000 in139.700 mm	N/A 3 in76.2 mm	N/A 4.4995 in114.287 mm	N/A
IR-769248	N/A 4.750 in	N/A 4.750 in120.65 mm	N/A 5.7500 in146.050 mm	N/A 3 in76.2 mm	N/A 4.7494 in120.635 mm	N/A
IR-809640	N/A 5 in	N/A 5.000 in127 mm	N/A 6 in152.400 mm	N/A 2.5000 in63.500 mm	N/A 4.9994 in126.985 mm	N/A
IR-809648	N/A 5 in	N/A 5.000 in127 mm	N/A 6 in152.400 mm	N/A 3 in76.2 mm	N/A 4.9994 in126.985 mm	N/A
IR-8810440	N/A 5.5 in	N/A 5.500 in139.7 mm	N/A 6 1/2 in165.1 mm	N/A 2.5000 in63.500 mm	N/A 5.4994 in139.685 mm	N/A
IR-8810448	N/A 5.5 in	N/A 5.500 in139.7 mm	N/A 6 1/2 in165.1 mm	N/A 3 in76.2 mm	N/A 5.4994 in139.685 mm	N/A
IR-9611648	N/A 6.000 in	N/A 6.000 in152.4 mm	N/A 7-1/4 in184.150 mm	N/A 3 in76.2 mm	N/A 5.9994 in152.385 mm	N/A
IR-10412448	N/A 6.5 in	N/A 6.5 in165.1 mm	N/A 7.7500 in196.850 mm	N/A 3 in76.2 mm	N/A 6.4994 in165.085 mm	N/A
IR-11213248	N/A 7.000 in	N/A 7.000 in177.8 mm	N/A 8-1/4 in209.55 mm	N/A 3 in76.2 mm	N/A 6.9994 in177.785 mm	N/A
IR-12014048	N/A 7.500 in	N/A 7.500 in190.5 mm	N/A 8-3/4 in222.250 mm	N/A 3 in76.2 mm	N/A 7.4994 in190.485 mm	N/A
IR-12814848	N/A 8.000 in	N/A 8.000 in203.2 mm	N/A 9.25 in234.95 mm	N/A 3 in76.2 mm	N/A 7.9994 in203.185 mm	N/A

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Shaft Diameter (in)

Part Number

Shaft Diameter

Dimension D

Dimension F

Dimension B

Max. Loose Transition Fit S

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