Your Cart
Items
Free Shipping on orders over $500.00
Part # A4138-20629
BEARING CUP, CL 2 CODE 629, FA
Get everything you need
Product Details
Specifications
- Approval
- FAA PMA
- Condition
- New
- Manufacturer
- The Timken Company
- Dimensions
- L: 3 x W: 3 x H: 2 in
- Weight
- 0.068 lbs
- Unit of Measure
- Each
- McFarlane Part Number
- A4138-20629
Product Description
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
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.
WARNING: Cancer and/or Reproductive Harm - California Proposition 65 Resources
Eligible Aircraft
| Make | Model | Start S/N | End S/N | Eligibility Chart |
|---|---|---|---|---|
| Cessna 180F | 180F | S/N 18051184 – 18051312 | 18051312 | Eligibility Chart 6693 |
| Cessna 180G | 180G | S/N 18051313 – 18051445 | 18051445 | Eligibility Chart 6693 |
| Cessna 180H | 180H | S/N 18051446 – 18052284 | 18052284 | Eligibility Chart 6693 |
| Cessna 180J | 180J | S/N 18052285 – 18052384 | 18052384 | Eligibility Chart 6693 |
| Cessna 180J | 180J | S/N 18052385 – 18052770 | 18052770 | Eligibility Chart 6693 |
| Cessna 185 | 185 | S/N 185-0001 – 185-0237 | 185-0237 | Eligibility Chart 6693 |
| Cessna 185A | 185A | S/N 185-0238 – 185-0512 | 185-0512 | Eligibility Chart 6693 |
| Cessna 185B | 185B | S/N 185-0513 – 185-0653 | 185-0653 | Eligibility Chart 6693 |
| Cessna 185C | 185C | S/N 185-0654 – 185-0776 | 185-0776 | Eligibility Chart 6693 |
| Cessna 185D | 185D | S/N 185-0777 – 185-0967 | 185-0967 | Eligibility Chart 6693 |
| Cessna 185E | 185E | S/N 185-0968 – 185-1149 | 185-1149 | Eligibility Chart 6693 |
| Cessna A185E | A185E | S/N 18501600 – 18502090 | 18502090 | Eligibility Chart 6693 |
| Cessna A185E | A185E | S/N 185-0968 – 185-1599 | 185-1599 | Eligibility Chart 6693 |
| Cessna A185F | A185F | S/N 18502091 – 18502310 | 18502310 | Eligibility Chart 6693 |
| Cessna A185F | A185F | S/N 18502311 – 18504448 | 18504448 | Eligibility Chart 6693 |
Cross Reference
Reference only: Please verify the product is eligible for your aircraft before adding to your cart.
-
A4138
