13889-20629 – Timken Aerospace Tapered Roller Bearing (Cone)
Available now on the Airparts.aero Marketplace.
The Timken 13889-20629 is a high-precision tapered roller bearing cone (inner ring and rollers) specifically engineered for aerospace landing gear and high-load rotation applications. While the base "13889" part number is a common industry standard for a 1.5-inch bore bearing, the -20629 dash number designates it as part of Timken’s Aerospace Series. This means the component has undergone rigorous quality control, including magnetic particle inspection and vacuum-degassed metallurgy, to ensure it meets the reliability standards required for flight.
Tapered roller bearings are the preferred choice for aircraft wheel hubs because they can manage Combined Loads. Unlike standard ball bearings, which primarily handle radial weight, the 13889-20629's tapered geometry allows it to simultaneously support the Radial Load (the vertical weight of the aircraft) and the Thrust Load (the lateral "side-loading" force generated during crosswind landings or high-speed taxiing).
Key Features
Precision-Ground Geometry: Optimized for low friction and minimal heat generation, critical for the high-RPM environment of aircraft takeoffs.
Case-Carburized Steel: Features a "hardened skin" for wear resistance and a "ductile core" to absorb the high-impact shocks of hard landings without fracturing.
High-Vacuum Degassed Steel: Manufactured with ultra-clean steel to eliminate microscopic internal impurities, significantly extending the bearing’s fatigue life.
Controlled-Contour Rollers: Designed to distribute stress evenly across the contact area, preventing "edge loading" and premature spalling (chipping) of the metal.
Vibration Resistance: Tight tolerances help reduce wheel "shimmy" and harmonic vibration in nose-gear assemblies.
Technical Specifications
Part Number: 13889-20629
Manufacturer: Timken (Aerospace Division)
Component Type: Tapered Roller Bearing (Cone Only)
Bore Diameter (d): 1.5000 in (38.100 mm)
Cone Width (B): 0.6500 in (16.510 mm)
Material: High-Purity Alloy Steel (Case-Hardened)
Matching Cup (Outer Race): Typically pairs with Timken 13830 (Verify with IPC)
Certification: FAA-PMA / OEM Certified
Aircraft Compatibility
Cessna Citation Series: 500, 525 (CJ), 550, and 560 models.
Beechcraft King Air Series: 90, 200, and 300 series.
Cessna 208/208B Caravan: Standard for both main and nose wheel hubs.
Piper PA-31 Navajo & PA-42 Cheyenne: Found in heavy-duty landing gear configurations.
Note: This 1.5-inch bearing is one of the most common sizes in general and business aviation. Always verify your axle size and specific wheel assembly part number in the Illustrated Parts Catalog (IPC).
Why Choose the Timken 13889-20629?
Timken is the global leader in tapered bearing technology, and the 20629 revision is specifically tuned for the "Low-Friction, High-Load" cycles of turbine aircraft. Using an industrial-grade "will-fit" bearing in an aircraft wheel is a safety risk; industrial bearings are not typically tested for the extreme centrifugal forces or the thermal shock of going from freezing altitudes to a high-speed landing in seconds. The Timken 13889-20629 provides the documented performance margins required to ensure smooth deceleration and long-term hub reliability.
Maintenance & Installation Addendum
The service life of a 13889-20629 is determined by Preload and Lubrication.
Tech Tip: During installation, "Bearing Packing" is mandatory. Use only approved aerospace grease (e.g., Mobilgrease 28 or AeroShell 22). When adjusting the axle nut, ensure the final "Rolling Torque" or "End Play" meets the Aircraft Maintenance Manual (AMM) Chapter 32 requirements. A bearing that is too tight will overheat and seize; one that is too loose will allow the wheel to wobble, destroying the axle and seals.
Note: The 13889-20629 is a safety-critical part. During every tire change or annual inspection, look for "bluing" (heat damage), "pitting," or "spalling" (surface flaking). If any roughness is felt when rotating the cone by hand, it must be replaced. Installation must be performed by a certified A&P mechanic.
Documentation
Approved Replacement for Partnumbers:
- 13889
- 214-00200
FAA Eligibility [Click Here]
13889-20629
13800 Series Single Cone; 1 1/2" Straight Bore; 0.4690" Wide; 0.060" Maximum Shaft Fillet Radius; Standard Tolerance
Timken® tapered roller bearings for landing wheels meet the stringent performance demands of these aircraft wheels – whether in large commercial transports or small private airplanes. Timken marks these bearings with “20629” (inch) or “N0629” (metric), signifying that they are designated and manufactured for these applications. In most commercial applications, Timken holds Part Manufacturer Approval (PMA) from the FAA.
Size Range: 1.375 in. to 10.5625 in. OD (0.500 in. to 9.125 in. cone bore)
Design Attributes:
- Design meets both customer and FAA quality standards.
- Performance code 629 bearing enhancements are the standard configuration for current and new applications. These advanced bearings achieve superior performance through tightened tolerances and are able to accommodate the repeated spike loads of the weight of a jumbo jet during landing.
- Engineered surfaces are available to further improve wear, fatigue and frictional performance.
Applications:
- Main and nose landing wheel assemblies for private, commercial and military aircraft
Engineered Surfaces for Aircraft Bearings
Timken Engineered Surfaces incorporated into aircraft landing wheels can solve rib/roller end scuffing common in aerospace applications
**Timken Bearings Dimension Catalog [Click Here]
Fits Aircraft Models:
- Aerostar: PA-60-600(Aerostar 600), PA-60-601(Aerostar 601)
- Cessna: 120, 140, 150C, 150D, 150E, 150F, 150G, 150H, 150J, 150K, A150K, 150L, A150L, 152, A152,170, 172, 175, 177A, 177B, 177RG, 180, 182, 182E, 182F, 182N, 182S, 180G, 180H, 185, 185A, 185C, D, E, A185E, A185F, 188, A188, 188A,A188A, 188B, A188B, T188C, 206, U206, 207, 210C, 210K, T210K, 210L, T210L, 210N, P210, P210N, 208 Caravan 1, 208B, 305B, 305E, 310, 320, 336 Skymaster, 337, 337A, 337E, 411, 411A, 414, 421B, 500 , 501, 550, 551
- Commander: 112, 112B, 112TCA, 114, 114B
- Mooney:M20, M20A, M20B, M20C, M20D, M20E, M20F, M20G, M20J, M20K, M20M
- Raytheon: B19, 23, A23, C23, T-34C, 35, V35, 35-C33, 35-B33, 35-C33A, G33, F33A, F33C, V35B, 36, A36, A36TC, B36TC, A60, 76, D95A, 95, 95-B55, E55, 58, 58P, 58TC, 60, A60, B60, 99, 99A, A99A, B99, C99, 100, A100, B100, F90, 200,1900, 1900C
- Piper: PA-18, PA-20, PA-22, PA-22-108, PA-23-235, PA-23-250, PA-24, PA-24-250, PA-24-260, PA-24-400, PA-25, PA-28-140, PA-2-150, PA-28-160, PA-28-151, PA-28-161, PA-28-180, PA-28-181, PA-28-235, PA-28-236, PA-28R-180, PA-28R-200, PA-28-201T, PS-28R-201, PA-28RT-201, PA-28R-201T, PA-30, PA-39, PA-31-300, PA-31-325, PA-31-350, PA-32-260, PA-32-300, PA-32-301, PA-32-301T, PA-32R-300, PA-32RT-300, PA-32RT-300T, PA-34-200, PA-34-200T, PA-34-220T, PA-44-180, PA-44-180T, PA-46-310P, -350P