M83248/1-228 – Aerospace O-Ring
Available now on the Airparts.aero Marketplace.
Overview
The M83248/1-228 is a military-standard, preformed packing O-ring engineered for the most demanding sealing applications in high-performance aerospace systems. This O-ring is manufactured in strict accordance with the MIL-DTL-83248 Type 1, Class 1 specification, which mandates the use of a high-hardness, 90-durometer Fluorocarbon (FKM) elastomer, commonly known by the trade name Viton®. It is specifically designed to provide a reliable, long-lasting seal in static applications involving high pressures and high temperatures, particularly in systems using synthetic turbine oils, fuels, and hydraulic fluids.
Key Features
- High-Temperature Fluorocarbon (FKM) Material: Fabricated from a Viton® (FKM) elastomer with a 90-durometer hardness. This material provides exceptional resistance to chemical degradation and maintains its physical properties at continuous operating temperatures up to 400°F (204°C).
- High-Pressure Extrusion Resistance: The hard, 90-durometer rating makes this O-ring extremely resistant to "extrusion"—the phenomenon where high pressure forces a softer seal into the clearance gap between two parts. This often allows it to be used without backup rings in high-pressure static seals.
- Superior Fluid Compatibility: Offers excellent resistance to a wide array of aggressive fluids, including synthetic turbine oils (MIL-PRF-23699), petroleum-based oils, jet fuels, and both petroleum-based (MIL-H-5606) and synthetic (MIL-H-83282) hydraulic fluids.
- Mil-Spec Certified Quality: As a certified military specification part, the M83248/1-228 guarantees full material traceability, dimensional accuracy, and performance characteristics that meet the highest standards for safety and airworthiness. It is the direct superseding part for the legacy M25988/1-228.
- Distinctive Color-Coding: The brown color of the O-ring is mandated by the M83248/1 specification, providing immediate visual confirmation that the correct, high-temperature, high-durometer FKM material is being used for the application.
Technical Specifications
- Standard: MIL-DTL-83248 Type 1, Class 1
- Full Part Number: M83248/1-228
- Legacy Part Number: M25988/1-228
- Material: Fluorocarbon Rubber (FKM / Viton®)
- Durometer (Hardness): 90 Shore A
- Color: Brown
- AS568 Dash Size: -228
- Nominal Dimensions:
- Inside Diameter (I.D.): 2.237 inches
- Cross Section (C.S.): 0.139 inches
- Operating Temperature Range: Approximately -15°F to 400°F (-26°C to 204°C)
Aircraft Compatibility
The M83248/1-228 is a high-performance seal used across all categories of aviation where high temperatures and pressures are encountered, including high-performance piston aircraft, business jets, and military platforms.
- Common Applications:
- Turbine Engine Systems: Used as static seals in lubrication systems, fuel control units (FCUs), fuel pumps, and accessory gearboxes.
- High-Performance Piston Engines: Utilized in firewall forward applications near turbochargers and exhaust components where temperatures exceed the limits of standard Nitrile seals.
- High-Pressure Hydraulic Systems: Serves as a primary static seal in hydraulic pumps, valves, and actuator end caps, especially in systems using synthetic, fire-resistant fluids.
Applications
The M83248/1-228 is the specified sealing solution for the most demanding static sealing challenges:
- High-Temperature, High-Pressure Sealing: Its primary application is in static joints that must maintain a leak-proof seal under high pressures and at elevated temperatures.
- Aggressive Fluid Containment: Provides a durable, long-term seal in constant contact with synthetic lubricants and hydraulic fluids that would cause other elastomers to swell, soften, or fail.
- Component Overhaul: A mandatory replacement item during the overhaul of any high-performance fuel, oil, or hydraulic component.
Why Choose M83248/1-228?
In high-temperature and high-pressure systems, an O-ring failure can lead to a critical fluid leak, creating a serious fire hazard and risking system failure. The M83248/1-228 is specifically engineered to perform reliably in these extreme conditions. Its high-durometer FKM construction provides a robust defense against extrusion and chemical attack. Using a genuine, certified Mil-Spec part is the only way to ensure the O-ring has the correct, tested material properties to perform reliably, ensuring the safety and airworthiness of the aircraft.
Order Your M83248/1-228 O-Rings Now
Ensure the integrity of your high-performance fluid systems with certified, military-specification seals. Visit Airparts.aero to order your M83248/1-228 O-rings today.
The MIL-DTL-83248 specification for O-rings represents a significant step up in performance from standard hydraulic seals. The Fluorocarbon (FKM) polymer's molecular structure, characterized by strong carbon-fluorine bonds, provides exceptional thermal stability and chemical inertness. The high 90-durometer hardness of the M83248/1-228 significantly increases its resistance to "extrusion," a failure mode where high pressure forces the O-ring material into the small clearance gap between two mating surfaces. This makes it particularly suitable for static face seals in high-pressure systems, as it can often maintain a seal without the need for a separate, hard plastic or metal "backup ring," simplifying design and assembly.
Note: This is a flight-critical sealing component. Always verify the correct O-ring part number from the applicable component maintenance manual (CMM) or aircraft Illustrated Parts Catalog (IPC). Ensure the O-ring is within its specified shelf life before installation. Lubricate with a clean, compatible system fluid to prevent damage during assembly. The brown color is a critical material identifier and should not be substituted.
