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2. Ford 9-inch axle - Wikipedia

   en.wikipedia.org/wiki/Ford_9-inch_axle

   Factory center section's biggest flaw is the pinion bearing pilot support, which are prone to cracking due to the nature of the pinion gear/crown gear relationship. Factory center sections carry two (2) different bearing dimensions (3.0625 and 3.250 in or 77.7875 and 82.5500 mm).

3. Thrust bearing - Wikipedia

   en.wikipedia.org/wiki/Thrust_bearing

   The small size (one-tenth the size of old bearing designs), low friction and long life of Kingsbury and Michell's invention made possible the development of more powerful engines and propellers. They were used extensively in ships built during World War I , and have become the standard bearing used on turbine shafts in ships and power plants ...

4. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

5. Aerospace bearing - Wikipedia

   en.wikipedia.org/wiki/Aerospace_bearing

   Aerospace bearings are the bearings installed in aircraft and aerospace systems including commercial, private, military, or space applications. Materials include M50 tool steel (AMS6491), carbon chrome steel (AMS6444), the corrosion resistant AMS5930, 440C stainless steel, silicon nitride (ceramic) and titanium carbide-coated 440C.

6. Leading wheel - Wikipedia

   en.wikipedia.org/wiki/Leading_wheel

   The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves and to support the front portion of the boiler.

7. ABEC scale - Wikipedia

   en.wikipedia.org/wiki/ABEC_scale

   Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.