M83248/2-906 - Textron Aviation Cessna OEM Preformed Packing Fluorocarbon O-Ring

M83248/2-906 – Textron Aviation Cessna OEM Preformed Packing Fluorocarbon O-Ring

Available now on the Airparts.aero Marketplace.

Overview

The M83248/2-906 is a mil-spec, high-pressure, preformed packing, commonly known as an O-ring, specified by Textron Aviation for critical sealing applications in their aircraft. This is not a standard industrial O-ring; it is a precision-molded seal manufactured in strict accordance with the military specification MIL-DTL-83248/2. This standard dictates a specialized fluorocarbon (FKM, Viton® type) elastomer compound engineered for improved performance at the low temperatures encountered at altitude, a critical enhancement over standard FKM materials. The -906 size designation indicates it is specifically for use as a boss gasket seal on -6 (3/8 inch) straight thread tube fittings.

This O-ring is designed to create a positive, leak-proof seal in high-pressure hydraulic, fuel, and lubrication systems. Its 90-durometer hardness provides exceptional resistance to extrusion under pressure. As a component whose failure could lead to the catastrophic loss of flammable fluids, the use of this fully certified, OEM-traceable M83248/2-906 O-ring is an absolute requirement for airworthy maintenance and repair.

Key Features

• Mil-Spec Certified: Manufactured and tested in strict accordance with MIL-DTL-83248/2, ensuring material composition, dimensional accuracy, and performance.

• Fluorocarbon FKM Material: Made from a high-grade fluorocarbon elastomer, providing excellent resistance to petroleum-based hydraulic fluids (e.g., MIL-PRF-5606), engine oils, and aviation fuels.

• Improved Low-Temperature Performance: The M83248/2 compound is specifically formulated to remain flexible and effective at low temperatures, preventing leaks during cold-soak conditions at high altitude.

• 90 Durometer Hardness: The high hardness (Shore A) provides superior resistance to extrusion and nibbling in high-pressure applications (up to 3,000 PSI).

• High-Pressure Boss Seal: The -906 size is specifically designed to seal straight thread tube fittings against a flat boss, a common connection method for pumps, actuators, and valves.

Technical Specifications

• Part Number / Specification: M83248/2-906

• Component Type: O-Ring / Preformed Packing (Boss Gasket Seal)

• OEM Designator: Textron Aviation (Cessna)

• Material: Fluorocarbon Rubber (FKM), 90 Durometer (Shore A)

• Size Standard: AS568 Dash Number -906 (for a 9/16-18 straight thread boss, corresponding to a -6 or 3/8" tube OD fitting).

• Governing Specification: MIL-DTL-83248/2

• Typical Operating Temperature Range: -40°F to 400°F (-40°C to 204°C)

Aircraft Compatibility

• Textron Aviation (Cessna): This mil-spec O-ring is used extensively across the Cessna product line, from piston singles to Citation jets, in any location where a -906 FKM O-ring is specified by the maintenance manual or IPC.

Note: The correct O-ring material and part number must be verified in the aircraft's official maintenance documentation. O-ring selection is critical and system-dependent.

Applications

• Hydraulic Systems: Sealing high-pressure lines and components, such as brake cylinders, landing gear actuators, and power packs.

• Fuel Systems: Used on fuel pumps, selector valves, and filter housings where a high-pressure seal is required.

• Engine & Propeller Systems: Sealing lubrication lines, propeller governors, and other engine accessories that utilize straight thread boss fittings.

Why Choose M83248/2-906?

An O-ring is one of the most critical and least expensive components in a fluid system. Using a generic, non-certified part is an unacceptable risk. An incorrect O-ring may be made from the wrong material (e.g., Nitrile instead of Fluorocarbon), which will swell, harden, or dissolve when exposed to aviation fluids. It may have the wrong durometer, leading to extrusion failure under pressure. It may lack the low-temperature properties, causing it to shrink and leak at altitude. A failure of this single component can lead to a catastrophic, in-flight leak of flammable hydraulic fluid or fuel, potentially resulting in fire or loss of control. The certified M83248/2-906 is a low-cost guarantee of material integrity and safety.

Website Metadata

• Meta Title (Max 60 chars): M83248/2-906 | FKM O-Ring 90 Duro Boss Seal | Mil-Spec

• Meta Description (Max 160 chars): Genuine M83248/2-906 mil-spec O-ring. 90 durometer fluorocarbon (FKM) for high-pressure hydraulic and fuel systems. -906 size for 3/8" boss fittings.

• SEO Keywords & Phrases: M83248/2-906, aircraft o-ring, fluorocarbon o-ring, FKM viton, 90 durometer, boss seal, MS28775-906, MIL-DTL-83248, high pressure seal, hydraulic o-ring, fuel o-ring, Textron Cessna parts, M83248/2-906 for sale

SEO-Enhanced Addendum

The engineering principle behind the specification of a 90 durometer elastomer for the M83248/2-906 is rooted in the physics of high-pressure sealing and the prevention of extrusion. In a boss fitting, system pressure energizes the O-ring, forcing it against the walls of the gland. Simultaneously, this pressure attempts to push the solid elastomer material through the microscopic clearance between the two metal components (the extrusion gap). A softer material (e.g., 70 durometer) would deform more easily and be "nibbled" away as it is forced into this gap, leading to rapid seal failure. The 90 Shore A hardness of the M83248/2 compound provides a high modulus of elasticity and significant resistance to this plastic deformation. This allows the O-ring itself to bridge the extrusion gap under high pressure (typically up to 3,000 PSI) without requiring the additional complexity and weight of a separate, rigid anti-extrusion backup ring.

Note: The M83248/2-906 is a flight-critical seal. Never reuse O-rings. Always install a new, certified O-ring whenever a fitting is disconnected. Inspect the sealing surfaces on the fitting and the boss for any nicks, scratches, or corrosion before installation. Lightly lubricate the new O-ring with clean system fluid to prevent damage during installation. Ensure the O-ring is not twisted in the gland.

Documentation

• MIL-DTL-83248/2: The military detail specification sheet defines all material, dimensional, and testing requirements for this O-ring and is publicly available through the Defense Logistics Agency ASSIST database and various online mil-spec libraries.