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Unit of Measure

Key Dimensions

Engineering Group

 N/A Mounted Bearing

Bearing Number

 N/A 22218

Shaft Size

 N/A 3 1/2 in

Shaft Size Type

 N/A Imperial

Full Timken Part Number

 N/A QAACMD18A308SB QAACMD18A308SC QAACMD18A308SEB QAACMD18A308SEC QAACMD18A308SEM QAACMD18A308SEN QAACMD18A308SEO QAACMD18A308SET QAACMD18A308SM QAACMD18A308SN QAACMD18A308SO QAACMD18A308ST

Locking Style

 N/A Double Concentric

Housing Construction

 N/A Piloted Flange Cartridge

Other Dimensions

Dimension BC

 N/A 8.63 in219.2 mm

Dimension C

 N/A 4.76 in120.9 mm

Dimension D

 N/A 7.38 in187.5 mm

Dimension E

 N/A 6.1 in154.9 mm

Dimension B Exp

 N/A 2.96 in75.2 mm

Dimension B Fix

 N/A 2.88 in73.2 mm

Dimension F

 N/A 10.34 in262.6 mm

Dimension H

 N/A 1 in25.4 mm

Dimension J (Bolt Size)

 N/A 0.75 in20 mm

Dimension M

 N/A 2.59 in65.8 mm

Dimension L Exp

 N/A 4.27 in108.5 mm

Dimension L Fix

 N/A 4.19 in106.4 mm

Dimension RAA

 N/A 0.99 in25.1 mm

Dimension SAA

 N/A 5.12 in131.6 mm

Dimension G

 N/A 7.38 in187.3 mm

Dimension N

 N/A 1.31 in33.3 mm

Radial and Thrust Factors

C0 - Static Load

 N/A 87200 lbf388000 N

C - Dynamic Load (Basic)

 N/A 79700 lbf355000 N

e - Geometry Factor

 N/A 0.23

Y1 - Geometry Factor

 N/A 2.90

Y2 - Geometry Factor

 N/A 4.31

Engineering Seal Speed

Oil Lubrication - M/N Seal

 N/A 1400 rpm

Oil Lubrication - T Seal

 N/A 2400 rpm

Oil Lubrication - B/C/O Seal

 N/A 1000 rpm

Grease Lubrication - M/N Seal

 N/A 1400 rpm

Grease Lubrication - T Seal

 N/A 2000 rpm

Grease Lubrication - B/C/O Seal

 N/A 1000 rpm

Engineering Bearing Attributes

Float

 N/A 0.083 in2.108 mm

Shaft Tolerance

 N/A 0.0030 in0.076 mm

Engineering Internal Radial Clearance

Eng Internal Radial Clearance - Min

 N/A 0.0024

Eng Internal Radial Clearance - Max

 N/A 0.0039

Pre Install Clearance Min

 N/A 0.060 in0.0024 mm

Pre Install Clearance Max

 N/A 0.100 in0.0039 mm