Inner Ring (IR)

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Inner Ring (IR)

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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.

Timken Part Number	Shaft Diameter	Dimension D	Dimension F	Dimension B	Max. Loose Transition Fit S
IR-506032	Shaft Diameter N/A 3.125 in	Dimension D N/A 3.125 in79.375 mm	Dimension F N/A 3.750 in95.25 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 79.365 mm3.1246 in
IR-526032	Shaft Diameter N/A 3.250 in	Dimension D N/A 3.250 in82.550 mm	Dimension F N/A 3.750 in95.25 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 82.537 mm3.2495 in
IR-526432	Shaft Diameter N/A 3.250 in	Dimension D N/A 3.250 in82.550 mm	Dimension F N/A 4.000 in101.60 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 82.537 mm3.2495 in
IR-546432	Shaft Diameter N/A 3.375 in	Dimension D N/A 3.375 in85.725 mm	Dimension F N/A 4.000 in101.60 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 85.712 mm3.3745 in
IR-566432	Shaft Diameter N/A 3.500 in	Dimension D N/A 3.500 in88.9 mm	Dimension F N/A 4.000 in101.60 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 88.887 mm3.4995 in
IR-566832	Shaft Diameter N/A 3.500 in	Dimension D N/A 3.500 in88.9 mm	Dimension F N/A 4.250 in107.95 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 88.887 mm3.4995 in
IR-606832	Shaft Diameter N/A 3.750 in	Dimension D N/A 3.750 in95.250 mm	Dimension F N/A 4.250 in107.95 mm	Dimension B N/A 2.000 in50.80 mm	Max. Loose Transition Fit S N/A 95.237 mm3.7495 in
IR-607236	Shaft Diameter N/A 3.750 in	Dimension D N/A 3.750 in95.250 mm	Dimension F N/A 4.500 in114.30 mm	Dimension B N/A 2.250 in57.15 mm	Max. Loose Transition Fit S N/A 95.237 mm3.7495 in
IR-607240	Shaft Diameter N/A 3.750 in	Dimension D N/A 3.750 in95.250 mm	Dimension F N/A 4.500 in114.30 mm	Dimension B N/A 2.500 in63.50 mm	Max. Loose Transition Fit S N/A 95.237 mm3.7495 in
IR-648036	Shaft Diameter N/A 4.000 in	Dimension D N/A 4 in101.6 mm	Dimension F N/A 5.000 in127 mm	Dimension B N/A 2.250 in57.15 mm	Max. Loose Transition Fit S N/A 101.587 mm3.9995 in
IR-648040	Shaft Diameter N/A 4.000 in	Dimension D N/A 4 in101.6 mm	Dimension F N/A 5.000 in127 mm	Dimension B N/A 2.500 in63.50 mm	Max. Loose Transition Fit S N/A 101.587 mm3.9995 in
IR-688036	Shaft Diameter N/A 4.250 in	Dimension D N/A 4.25 in107.950 mm	Dimension F N/A 5.000 in127 mm	Dimension B N/A 2.250 in57.15 mm	Max. Loose Transition Fit S N/A 107.937 mm4.2495 in
IR-728840	Shaft Diameter N/A 4.500 in	Dimension D N/A 4.500 in114.3 mm	Dimension F N/A 5.500 in139.7 mm	Dimension B N/A 2.500 in63.50 mm	Max. Loose Transition Fit S N/A 114.287 mm4.4995 in
IR-728848	Shaft Diameter N/A 4.500 in	Dimension D N/A 4.500 in114.3 mm	Dimension F N/A 5.500 in139.7 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 114.287 mm4.4995 in
IR-769248	Shaft Diameter N/A 4.750 in	Dimension D N/A 4.75 in120.650 mm	Dimension F N/A 5.750 in146.05 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 120.635 mm4.7494 in
IR-809640	Shaft Diameter N/A 5.000 in	Dimension D N/A 5.00 in127.0 mm	Dimension F N/A 6.000 in152.40 mm	Dimension B N/A 2.500 in63.50 mm	Max. Loose Transition Fit S N/A 126.985 mm4.9994 in
IR-809648	Shaft Diameter N/A 5.000 in	Dimension D N/A 5.00 in127.0 mm	Dimension F N/A 6.000 in152.40 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 126.985 mm4.9994 in
IR-8810440	Shaft Diameter N/A 5.500 in	Dimension D N/A 5.50 in139.7 mm	Dimension F N/A 6.500 in165.10 mm	Dimension B N/A 2.500 in63.50 mm	Max. Loose Transition Fit S N/A 139.685 mm5.4994 in
IR-8810448	Shaft Diameter N/A 5.500 in	Dimension D N/A 5.50 in139.7 mm	Dimension F N/A 6.500 in165.10 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 139.685 mm5.4994 in
IR-9611648	Shaft Diameter N/A 6.000 in	Dimension D N/A 6.0 in152.4 mm	Dimension F N/A 7.250 in184.15 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 152.385 mm5.9994 in
IR-10412448	Shaft Diameter N/A 6.500 in	Dimension D N/A 6.500 in165.100 mm	Dimension F N/A 7.75 in196.85 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 165.085 mm6.4994 in
IR-11213248	Shaft Diameter N/A 7.000 in	Dimension D N/A 7.0 in177.800 mm	Dimension F N/A 8.250 in209.55 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 177.785 mm6.9994 in
IR-12014048	Shaft Diameter N/A 7.500 in	Dimension D N/A 7.500 in190.500 mm	Dimension F N/A 8.75 in222.25 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 190.485 mm7.4994 in
IR-12814848	Shaft Diameter N/A 8.000 in	Dimension D N/A 8.0 in203.200 mm	Dimension F N/A 9.250 in234.95 mm	Dimension B N/A 3.000 in76.20 mm	Max. Loose Transition Fit S N/A 203.185 mm7.9994 in