Timken – Aircraft Bearing Cone | M224749-20629 Top Quality Online

This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.

Specifications

• Series: M224700
• Cone Part Number: M224749
• Design Units: Imperial
• Cage Type: Stamped Steel
• C1 – Dynamic Radial Rating (Two-Row, 1 million revolutions)1
• 95700 lbf
• 426000 N
• C90(2) – Dynamic Radial Rating (Two-Row, 90 million revolutions)2
• 24800 lbf
• 110000 N
• Approvals: FAA/PMA

Don’t be tempted to buy cheapy automotive bearings

Because Timken uses the same base part number for both the automotive and aviation versions of these bearings, many people mistakenly use the lower quality automotive bearings in their airplane. Normally, Aviation bearing part numbers include the 20629 dash number. It is critical that the FAA-PMA Class 2 version be used for aircraft applications for two reasons:

• They are a higher class of bearing with tighter tolerance and have been subjected to more stringent quality control procedures. Due to the smaller diameter of aircraft wheels, at a given ground speed the bearings rotate at a much higher RPM and require the tighter tolerances to prevent premature failure.
• Example: At a 70 mph touchdown speed (equivalent to highway speed of a car), a typical 17 inch diameter airplane tire is rotating at 1384 RPM, whereas a typical 27 inch car tire is only rotating at 871 RPM. So even though the aircraft bearing is only subject to intermittent use, some of the performance demands are much higher than a typical automotive application.

It is a violation of FAA regulations to use non-approved automotive bearings on certified aircraft.

How to use: Mount the Timken Aircraft Bearing Cone (M224749-20629) in opposing pairs on a shaft as part of a tapered roller bearing setup. It comes with a stamped steel cage and specific dynamic radial ratings for different revolution counts. Note that due to its application in aircraft, it’s crucial to use the correct FAA-PMA Class 2 version. Do not use non-approved automotive bearings on certified aircraft as it violates FAA regulations. Maintenance: Keep the bearing clean and lubricated as per the manufacturer’s recommendations. Regularly inspect for any signs of wear or damage, especially considering the high RPM requirements during aircraft operation.