If you work anywhere near aircraft maintenance, manufacturing, or parts procurement, you've likely heard the term "bearings" tossed around constantly — but how much do you actually know about what these components do and why they matter so much in flight? Below, we break down the most common questions about aviation bearings in plain terms.
What exactly do aviation bearings do?
At the most basic level, a bearing is a mechanical component placed between two moving parts to reduce friction, support loads, and guide motion along a specific axis. In an aircraft, this function shows up almost everywhere motion happens. Aircraft bearings are found in ailerons, elevators, trim tabs, landing gear, thrust reversers, doors, and engine assemblies on fixed-wing aircraft — and in main and tail rotor systems, landing gear, and engine components on helicopters and other rotorcraft.
Without properly functioning bearings, these systems would experience excessive wear, friction, and eventually failure — which is exactly why they're treated as flight-critical components.
Why can't standard industrial bearings be used on aircraft?
This is one of the most important distinctions to understand. Aerospace bearings are engineered and manufactured to a much stricter standard than bearings used in typical industrial or automotive equipment. Aircraft systems operate under conditions most other machines never face — high-speed rotation, extreme temperature swings, constant vibration, and repeated stress cycles across thousands of flight hours.
Because of this, aerospace-grade bearings go through more rigorous material selection, tighter tolerances, and more thorough testing before they're cleared for use. A bearing that performs fine in a factory conveyor system simply isn't built to handle what an aircraft demands.
What are the different types of aviation bearings?
There isn't just one kind of bearing used across an aircraft — different systems call for different designs. The most common categories include:
Plain bearings — simple, widely used, and effective for basic rotational or sliding motion
Rolling-element bearings — built to handle heavier loads while minimizing friction
Fluid bearings — used where smooth, low-friction performance is required
Magnetic bearings — used in select systems requiring contact-free operation
Flexure bearings — designed for precise, limited-range movement
Choosing the correct type — and the correct part number within that type — is essential, since even a seemingly minor mismatch can affect system performance.
How do I find the right bearing for my aircraft or system?
This is usually the hardest part. Manuals reference specific part numbers, but locating those exact parts from a trustworthy source, quickly, is a different challenge entirely. This is exactly what an aviation bearing catalog is designed to solve — giving buyers a searchable database organized by part number, manufacturer, or category instead of forcing them to track down scattered documentation.
Distribution3sixty maintains a detailed aviation bearing catalog that lets buyers search across a wide range of approved manufacturers, with documentation and quality assurance built into the process — which matters most when time is limited, such as during an AOG situation.
What should I check before buying bearings from a supplier?
A few things are worth confirming every time:
Does the part number match your engineering or maintenance reference exactly?
Does the supplier provide manufacturer trace documentation and quality certifications?
Is the supplier accredited (AS9120B, ISO 9001:2015, etc.)?
How quickly can they turn around a quote and shipment?
Is their sourcing policy transparent and traceable?
Final Takeaway
Bearings rarely get much attention until something goes wrong — but understanding how aviation bearings work, what makes aircraft bearings different from standard industrial parts, and how to source them efficiently through a reliable aviation bearing catalog can save significant time and stress when a part is needed fast.
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