The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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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.
CRB-Inner-Ring-606832-top-angle-view.jpg
Inner Ring (IR)
Unit of Measure
1 

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
Unit of Measure
1