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  • CRB-Inner-Ring-606832-top-angle-view.jpg
  • Inner Ring (IR)-2
  • Inner Ring (IR)
  • 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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Bore (d) (in)

Part Number

Bore (d)

Dimension D

O.D. (F)

Width (B)

Max. Loose Transition Fit S

CAD

N/A 3.125 in N/A 3.125 in79.375 mm N/A 3.75 in95.25 mm N/A 2 in50.8 mm N/A 3.1246 in79.365 mm N/A
N/A 3.25 in N/A 3.250 in82.55 mm N/A 3.75 in95.25 mm N/A 2 in50.8 mm N/A 3.2495 in82.537 mm N/A
N/A 3.25 in N/A 3.250 in82.55 mm N/A 4 in101.6 mm N/A 2 in50.8 mm N/A 3.2495 in82.537 mm N/A
N/A 3.375 in N/A 3.375 in85.725 mm N/A 4 in101.6 mm N/A 2 in50.8 mm N/A 3.3745 in85.712 mm N/A
N/A 3.50 in N/A 3.500 in88.9 mm N/A 4 in101.6 mm N/A 2 in50.8 mm N/A 3.4995 in88.887 mm N/A
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
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
N/A 3.750 in N/A 3.750 in95.25 mm N/A 4.5000 in114.300 mm N/A 2.25 in57.15 mm N/A 3.7495 in95.237 mm N/A
N/A 3.750 in N/A 3.750 in95.25 mm N/A 4.5000 in114.300 mm N/A 2.5 in63.5 mm N/A 3.7495 in95.237 mm N/A
N/A 4 in N/A 4.000 in101.6 mm N/A 5 in127 mm N/A 2.25 in57.15 mm N/A 3.9995 in101.587 mm N/A
N/A 4 in N/A 4.000 in101.6 mm N/A 5 in127 mm N/A 2.5 in63.5 mm N/A 3.9995 in101.587 mm N/A
N/A 4.25 in N/A 4.250 in107.95 mm N/A 5 in127 mm N/A 2.25 in57.15 mm N/A 4.2495 in107.937 mm N/A
N/A 4.50 in N/A 4.500 in114.3 mm N/A 5.5 in139.7 mm N/A 2.5 in63.5 mm N/A 4.4995 in114.287 mm N/A
N/A 4.50 in N/A 4.500 in114.3 mm N/A 5.5 in139.7 mm N/A 3 in76.2 mm N/A 4.4995 in114.287 mm N/A
N/A 4.750 in N/A 4.750 in120.65 mm N/A 5.75 in146.05 mm N/A 3 in76.2 mm N/A 4.7494 in120.635 mm N/A
N/A 5 in N/A 5.000 in127 mm N/A 6 in152.4 mm N/A 2.5 in63.5 mm N/A 4.9994 in126.985 mm N/A
N/A 5 in N/A 5.000 in127 mm N/A 6 in152.4 mm N/A 3 in76.2 mm N/A 4.9994 in126.985 mm N/A
N/A 5.5 in N/A 5.500 in139.7 mm N/A 6.5 in165.1 mm N/A 2.5 in63.5 mm N/A 5.4994 in139.685 mm N/A
N/A 5.5 in N/A 5.500 in139.7 mm N/A 6.5 in165.1 mm N/A 3 in76.2 mm N/A 5.4994 in139.685 mm N/A
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
N/A 6.5 in N/A 6.5 in165.1 mm N/A 7.75 in196.85 mm N/A 3 in76.2 mm N/A 6.4994 in165.085 mm N/A
N/A 7.000 in N/A 7.000 in177.8 mm N/A 8.25 in209.55 mm N/A 3 in76.2 mm N/A 6.9994 in177.785 mm N/A
N/A 7.500 in N/A 7.500 in190.5 mm N/A 8.75 in222.25 mm N/A 3 in76.2 mm N/A 7.4994 in190.485 mm N/A
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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