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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 QAAFMD18A308SB QAAFMD18A308SC QAAFMD18A308SEB QAAFMD18A308SEC QAAFMD18A308SEM QAAFMD18A308SEN QAAFMD18A308SEO QAAFMD18A308SET QAAFMD18A308SM QAAFMD18A308SN QAAFMD18A308SO QAAFMD18A308ST

Locking Style

 N/A Double Concentric

Housing Construction

 N/A Flange Block

Other Dimensions

Dimension BC

 N/A 9.5 in241.3 mm

Dimension C

 N/A 5.13 in130.2 mm

Dimension D

 N/A 7.63 in193.8 mm

Dimension E

 N/A 6.72 in171.5 mm

Dimension F

 N/A 8.38 in212.7 mm

Dimension H

 N/A 1.28 in32.5 mm

Dimension J (Bolt Size)

 N/A 0.75 in20 mm

Dimension L Exp

 N/A 4.27 in108.6 mm

Dimension L Fix

 N/A 4.19 in106.5 mm

Dimension M

 N/A 2.59 in65.8 mm

Dimension N

 N/A 3.4 in86.4 mm

Dimension RAA

 N/A 0.94 in25 mm

Dimension SAA

 N/A 5.18 in131.6 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 0.0024 in0.060 mm

Pre Install Clearance Max

 N/A 0.0039 in0.100 mm