by RJ Mobbs · 2015 · Cited by 1426 — It may be difficult to correct coronal imbalance and restore lordosis (11,16,17). ... Recent studies have also explored MIS options for PLIF (49) and TLIF (49).

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Preventing Leaks: One of the primary functions of seals is to prevent the leakage of fluids like fuel, oil and hydraulic fluids, as well as gases such as air and nitrogen. Proper functioning of various systems can be ensured while protecting our environment from potential contamination.

Andrea Richard is a writer and editor with nearly 15 years of experience crafting content for a variety of industries. In writing for Jerry, Andrea’s mission is to deliver relatable and informative content so readers can better understand the costs associated with car ownership and car leasing. A native Floridian and a road trip enthusiast, Andrea first learned to drive on a Honda Accord when CDs were still a thing. She has served on the Society of Professional Journalists Florida board of directors and volunteers as a judge for national journalism contests. Her work has earned several awards for feature writing, investigative reporting and branded content campaigns.

Once the condition of your front or rear wheel bearings breaks down, your tires will wear out faster and can do so unevenly. Braking issues can occur. You also risk having your wheels lock up, which could lead to axle damage and other dangerous issues that are not worth the risk. Driving with a faulty wheel bearing is a safety hazard and not recommended.

Vibration & Movement: As with the automotive industry, aircraft and space components are subject to constant vibration and movement. In dynamic applications, at least one surface is in motion relative to the other. A typical example is a hydraulic cylinder with a shaft and a bore. Further, there are two directions of motion in dynamic applications: reciprocating or linear motion, and rotary (including oscillating) motion. Omniseal Solutions offers mostly radial seals (rod and piston seals) in such applications. Whether radial or axial (face) sealing is required, the seals must be flexible and durable to accommodate these dynamic conditions without losing their sealing capabilities.

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You don’t need to replace all four if one is faulty. You can just replace the single bad bearing—you don’t need to do the replacement in pairs like you would with new tires.

MIL-PRF-87257, MIL-PRF-7808, MIL-PRF-23699: Outlines the requirements for specific types of lubricant, particularly for use in aerospace applications.

MIL-PRF-5606, MIL-PRF-83282: Military specifications for hydraulic fluid used in aircraft, military aircraft, and other aerospace applications.

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Shop for the best Axle Seal for your vehicle, and you can place your order online and pick up for free at your local O'Reilly Auto Parts.

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Hycomp™ Composites: This polymer solution is used very often due to its lightweighting properties, good thermal oxidative stability, and compatibility with all aviation lubricants. More than half of the materials used in large aircraft today are composites, such as engine, flight control, landing gear, and wheel and braking systems. Solutions vary from bushings, guide rings, wear liners, seals, clamps, and thermal isolators.

Wheel bearings are a workhorse. They are crucial to your vehicle’s steering, handling and suspension because they join the wheel to the axle, enabling it to turn with limited friction. Replacing one wheel bearing can cost $350 or more on average in parts and labor, which means replacing all four in your car could cost more than $1,400.

If a mechanic determines that any of your wheel bearings are worn out, you’ll want to have them replaced as soon as possible to avoid further damage to your vehicle.

The above is not an exhaustive list and merely highlights some of the more well-known standards for sealing and material solutions. Omniseal Solutions is a long-standing partner with established Tier 1 and Tier 2 aviation customers that require specifications and material designations that are unique to their application or system. Each customer has different needs, and they need to be consistent. Adhering to standardized requirements ensures reliability, functional commonality, and operational compatibility between systems. This is one of the most business critical aspects when it comes to making a product or solution!

AMS7276: Material requirements for PTFE (polytetrafluoroethylene) seals, valued for chemical resistance and durability in aerospace applications.

Worn-out or damaged wheel bearings cannot be repaired and instead need to be replaced, ideally by a professional mechanic.

AMS6381: This standard specifies the requirements for nickel-copper alloys, which can also be relevant for seals used in corrosive environments.

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Omniseal Solutions’ custom sealing and wear-resistant solutions are designed not only to meet industry standards and stringent requirements of the specific applications but also provide long-term performance and reliability. Being qualified with many aerospace programs for over 60 years, Omniseal Solutions is known for their rapid response and agility in order to accommodate application needs whether related to advanced materials or custom engineered designs.

Grease and a seal are crucial for protecting a wheel bearing. The seal keeps the grease clean from dirt and moisture. If it begins to deteriorate, the grease can become compromised, which may cause the wheel bearing to overheat and become faulty.

Aerospace seals are critical components that enable those in the aviation and space industries to reach higher heights, proven to solve unique challenges, including extreme temperatures, high pressures, chemical exposure, and constant vibration. Using precision sealing solutions that follow stringent aerospace sealing standards is a successful path to optimal performance of your aviation and space systems, maximizing safety and reliability. With advanced materials, innovative designs, and rigorous testing protocols, manufacturers can develop seals and components that enable safe and efficient flight today as well as tomorrow. As Omniseal Solutions stays informed on the latest sealing standards and innovations, they can maintain their decades long record of safety and efficiency across all aerospace operations.

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AS1895: AS1895 provides general requirements for hydraulic seals, focusing on the materials and performance characteristics needed to maintain integrity in aerospace hydraulic systems. Spring-energized seals, particularly those used in dynamic hydraulic applications, must meet these general standards to ensure system reliability and safety.

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Rigorous testing: Seals are subjected to comprehensive testing protocols, including fatigue, pressure, and thermal cycling tests, ensuring reliability in real-world conditions.

MIL-G-5514: Specifications for high-performance hydraulic and pneumatic seals, capable of withstanding temperature variations and long-term wear.

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Modern aerospace engineering depends on a wide array of components to ensure safe and efficient operations, with precision seals being among one of the most critical. When you combine precision sealing solutions that adhere to stringent aerospace sealing and manufacturing standards, the results minimize maintenance, prevent leaks, reduce weight, and avoid catastrophic failures - protecting aircraft and launch vehicles and the lives who take flight. The path to qualifying components and equipment for aviation and space programs is often challenging due to the time-consuming and rigorous process.

ISO 4287: Surface roughness parameters essential for ensuring seal performance through controlled surface finish quality.

Cutting-edge materials: High-performance materials like fluorocarbons, polytetrafluoroethylene (PTFE), polyether ether ketones (PEEK), and PFAS-Free* polymers ensure durability under extreme temperatures and chemical exposure. Along with precision components, Omniseal Solutions provides high-performance materials that are included in the top tier of the polymer pyramid.

You can also contact our experts at help@omniseal-solutions.com for personalized guidance. Let’s work together to go beyond to make the skies safer and explore the wonders of space.

AS9100D: Aerospace Quality Management Standard ensuring product safety, reliability, and regulatory compliance. It is a critical standard for MRO organizations (Maintenance, Repair, and Overhaul) in the aerospace industry, ensuring that maintenance processes meet the stringent requirements for safety, quality, and regulatory compliance in the aviation sector.

Everett Cook is an award-winning journalist and editor with more than 10 years of experience across a variety of industries. In editing for Jerry, Everett’s mission is to help readers have a better understanding of the costs of owning or leasing a car and to better understand their vehicle in terms of insurance and repairs. Prior to joining Jerry, Everett was an editor for Axios. His previous work has been featured in The New York Times, The Los Angeles Times, The San Francisco Chronicle, The Atlantic, Atlantic Re:think, The Boston Globe, USA Today, and others. He’s also been a freelance writer and editor with experience in SEO, audience building, and long-term content roadmaps. Everett is a proud graduate of the University of Michigan.

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Hub style wheel bearings, the most common version used in modern vehicles, cost around $80 to $300 each. Don’t be alarmed if your mechanic says you need a new hub assembly, as this just means that the wheel bearings were installed inside the hub assembly at the factory, making it one complete part.

AS1234: Though primarily focused on elastomeric seals, AS1234 includes performance testing guidelines relevant for all aerospace seals. It covers high-temperature and high-pressure environments, which are critical areas where spring-energized seals and rotary lip seals excel, especially those made from polytetrafluoroethylene (PTFE), or other advanced polymers.

AS4832: AS4832 also specifies the test procedures and performance criteria for seals used in high-temperature, high-pressure applications, particularly in the aerospace industry. The standard is crucial for ensuring the reliability and safety of seals utilized in critical aerospace systems, such as engines and propulsion systems.

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Handling Temperature Ranges: Aerospace seals must operate in a wide range of temperatures, from the freezing conditions of high altitudes to the extreme heat of jet engines. Materials must consistently maintain their properties and performance across this temperature spectrum.

Polymer and metal seals in aerospace systems, i.e., aircraft engines, hydraulic systems, fuel systems, and environmental controls, maintain pressure, temperature, and fluid control, ensuring the reliability of numerous critical components. Due to the harsh environment of aviation and space operations, seals must endure extreme temperatures, pressures, and exposure to aggressive chemicals. Incorporating Omniseal Solutions’ materials and components in aerospace applications provides many technology advantages.

The Clavis Belt Frequency Meter is the industry standard for belt frequency measurement, allowing the user to measure frequencies up to 1000Hz.

For specific standards that your components need to conform to depend on the material composition, application environment, and performance requirements of the required seals. Omniseal Solutions’ engineers can help you determine what may be essential with a wide range of custom components, e.g., Omniseal® spring-energized seals, rotary lip seals, metal boss seals, bearings, and more. Put together, these standards are the backbone of safe, reliable aerospace operations, with high performance expected under the most extreme conditions.

Rulon® Fluoropolymers: This material solution is commonly used for aviation applications such as track liners and actuators as it offers low coefficient of friction, high wear life, excellent abrasion resistance, chemical inertness, and ability to operate in extreme temperature and pressure ranges. Since the early 1950s, Omniseal Solutions has been the exclusive developer of this proprietary material.

Excluding Contaminants & Chemical Exposure: Aerospace seals are exposed to aggressive chemicals, including hydraulic fluids, fuels, lubricants, and cleaning agents. They must resist chemical degradation to maintain integrity and performance and be a barrier against contaminants, e.g., dust, dirt, and moisture. Keeping harmful substances out of critical systems protect sensitive components from damage, thereby enhancing the longevity and reliability of the entire system.

AMS5510: This specification covers the properties of certain grades of stainless steel (like 304 and 316) that are commonly used for sealing applications.

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Reducing Friction & Wear: Seals also help minimize friction and wear between moving parts. By providing a protective barrier, they not only extend the lifespan of components but also improve overall efficiency, contributing to smoother operation and better performance.

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Road conditions like potholes, speed bumps, dirt, and sand can wear down the seal over time. Wheel bearings are designed to last a long time, often more than 100,000 miles, and don’t require routine maintenance. But once they show signs of wearing out, you’ll want to replace them as soon as you can get your car to a mechanic. The cost will vary depending on several factors, so call a few shops and ask for an estimate for the replacement for your vehicle’s make and model—and don’t delay getting it replaced.

AS4716: While AS4716 primarily deals with O-rings and dynamic elastomeric seals, it includes specifications for groove dimensions and tolerances for seals in aerospace hydraulic and pneumatic systems. Since spring-energized seals often fit into similar applications, this standard can be relevant for defining the installation environment, particularly groove design and surface finish.

AS4052: AS4052 provides material specifications and testing requirements for dynamic seals, including the material resilience needed for aerospace fluid power systems. Since spring-energized seals are often made from PTFE or other advanced polymers for aerospace use, this standard ensures that the materials meet the necessary thermal, chemical, and mechanical resistance requirements.

Meldin® Thermoplastics: These injection moldable materials can be found in helicopter nose landing gear, airplane jet engines and APUs as engineered shock strut bearings, sliding rings, bushings and piston rings, providing mechanical integrity, high thermal resistance, dimensional stability and low weight versus metal.

Your vehicle’s make and model, the type of bearings and parts used, labor rates, and where you have it serviced all factor into the cost you’ll pay for a wheel bearing replacement.

The range of the cost of labor for a wheel bearing replacement should be approximately $150 to $200, but auto mechanic labor costs can vary wildly depending on the region and the level of expertise needed to fix the problem.

Meldin® Polyimides: These materials exhibit high dimensional stability at high temperatures and longer life at higher loads and speeds, which makes them ideal as sealing rings in flight controls or structural parts in aircraft.

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Worried you might overpay for your wheel bearings replacement? Use Jerry’s GarageGuard to get a fair cost estimate for your wheel bearings replacement.

Weight Considerations: In aerospace applications, every gram counts. Seals must provide excellent performance without adding unnecessary weight to the aircraft in order to reduce fuel costs – a must for aviation and space customers.

AMS7257: A specification developed by SAE International that covers the requirements for a high-strength, corrosion-resistant alloy known as austenitic stainless steel. Specifically, AMS 7257C refers to a specific type of stainless steel that is often used in aerospace and other demanding engineering applications.

AMS2680: This is related to the properties of elastomeric materials used in conjunction with metal seals, which can also impact the overall sealing solution.

AMS4970: This specification pertains to titanium and titanium alloys, which are sometimes used in sealing applications due to their strength-to-weight ratio and corrosion resistance.

Omniseal Solutions goes beyond conventional testing by developing custom test rigs and numerical simulations to evaluate seal performance under your specific application’s conditions – another service provided to your business to meet the highest standards of safety and reliability.

Maintaining Pressures: Seals are a vital part in maintaining necessary pressure levels, especially in high-pressure systems like hydraulic and fuel systems. By keeping pressure consistent, seals optimize performance and efficiency in these demanding applications.

* PFAS-Free here means we do not intentionally add PFAS material in the product, but it does not exclude the possibility of traces, as these materials are common in the environment.

A wheel bearing is one of the multiple mechanical parts that you can find behind your car rims. It's the one that takes care of providing the car with proper, ...

MIL-DTL-25988: Covers fluorocarbon elastomer materials for seals in military aircraft, ensuring performance in extreme environments.

Recent advancements in sealing technologies and material science enable manufacturers to create custom designed seals and components that can withstand the extreme conditions typical of aerospace environments.