Part Number: 39250

Qty
BEARING CONE CL 2 CODE 629 FAA-PMA

Product Details

Wheel Bearing Cups and Cones 

FAA-PMA approved Timken wheel bearings for Goodyear, Cleveland, and McCauley wheels

  • Class 2 aviation grade FAA-PMA bearings (Timken designates these with a -20629 suffix)
  • Tighter tolerance and higher quality control than Class 4 automotive bearings
  • Save $$

 

Don't be tempted to buy cheapy automotive bearings

Because Timken uses the same part number for both the automotive and aviation versions of these bearings, many people mistakenly use the lower quality automotive bearings in their airplane. 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.

 

Wheel to Seal Kit and Bearing Cross Reference

Bearing Cup and Cone Dimensions

 

APS BlackSteel brake discs and linings, brake bleed valves, and wheel grease seals also available.

warningWARNING: Cancer and/or Reproductive Harm - www.P65warnings.ca.gov

Eligible Aircraft

Make Series Model Beginning S/N Ending S/N Quantity Per Aircraft Location Comment Eligibility Chart
Aerospatiale N 262 N 262 0 ZZZZZZZZZZZZZ
Air Tractor AT-800 AT-802 0 ZZZZZZZZZZZZZZZ
Boeing 720 720 0 ZZZZZZZZZZZZZZZ
Boeing 720 720B 0 ZZZZZZZZZZZZZZZ
Bombardier CL-600 CL-600-2B19 0 ZZZZZZZZZZZZZZZ
CASA (EADS) C-212 212-200 0 ZZZZZZZZZZZZZZZ
CASA (EADS) C-212 212-300 0 ZZZZZZZZZZZZZZZ
Convair 240 240 0 ZZZZZZZZZZZZZZZ
Convair 340 340 0 ZZZZZZZZZZZZZZZ
Convair 440 440 0 ZZZZZZZZZZZZZZZ
de Havilland (Viking Air) DHC-3 DHC-3 1 ZZZZZZZZZZZZZZZ
Martin 202 202 0 ZZZZZZZZZZZZZZZ
Martin 202 202A 0 ZZZZZZZZZZZZZZZ
Martin 404 404 0 ZZZZZZZZZZZZZZZ
Mitsubishi (NAMC) YS-11 YS-11 0 ZZZZZZZZZZZZZZZ

Related Product Catalog Pages

Wheel to Seal Kit and Bearing Cross Reference