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M83248/1-026 - Textron Aviation OEM O-Ring Seal

M83248/1-026 - Textron Aviation OEM O-Ring Seal

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$ 5.90 $ 5.90

M83248/1-026 – Textron Aviation OEM Fluorocarbon O-Ring Seal

Available now on the Airparts.aero Marketplace.

Overview

The M83248/1-026 is a flight-critical, genuine Textron Aviation Original Equipment Manufacturer (OEM) preformed packing O-ring seal. It is manufactured in strict accordance with Military Specification MIL-PRF-83248/1, which defines the requirements for high-performance Fluorocarbon (FKM) elastomer O-rings. This specific component is engineered for static sealing applications in aircraft systems that operate with petroleum-based hydraulic fluids, lubricating oils, and fuels at elevated temperatures.

The -026 suffix designates the O-ring's size according to the AS568 dimensional standard. The FKM material, commonly known by the trade name Viton®, provides exceptional resistance to chemical attack and thermal degradation up to 400°F (204°C), significantly exceeding the capabilities of standard Nitrile (NBR) seals. As a genuine Textron Aviation part, this O-ring guarantees the precise material compound, dimensional tolerances, and quality control required for reliable, leak-free performance in demanding aerospace environments.

Key Features

  • Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct material performance and airworthiness.

  • MIL-PRF-83248/1 Compliance: Manufactured and tested to meet the rigorous military standard for 75 durometer Fluorocarbon (FKM) O-rings.

  • High-Temperature Fluorocarbon (FKM): Fabricated from a Viton® or equivalent FKM elastomer, providing a continuous service temperature rating of up to 400°F (204°C).

  • Excellent Fluid Resistance: Offers superior, long-term resistance to petroleum-based and synthetic lubricating oils, hydraulic fluids (MIL-PRF-5606, MIL-PRF-83282), jet fuels, and greases.

  • AS568 Size -026: Precisely dimensioned according to the AS568-026 standard for a perfect fit in corresponding glands.

  • Designed for Static Sealing: Provides a reliable seal between two stationary surfaces under pressure in high-temperature environments.

Technical Specifications

  • Part Number: M83248/1-026

  • Component Type: Preformed O-Ring Packing Seal

  • OEM Authority: Textron Aviation

  • Governing Specification: MIL-PRF-83248/1

  • Material: Fluorocarbon Elastomer (FKM / Viton®)

  • Hardness: 75 ± 5 Durometer Shore A

  • Color (Typical): Brown

  • Dimensions (AS568-026):

    • Inside Diameter (ID): 1.237 inches

    • Cross-Section (CS): 0.103 inches

  • Typical Temperature Range: -15°F to +400°F (-26°C to +204°C)

  • Compatible Fluids: Petroleum-based hydraulic fluids, synthetic lubricating oils, jet fuels, greases.

  • Incompatible Fluids: Phosphate ester hydraulic fluids (Skydrol®), ketones, strong acids.

Aircraft Compatibility

As a Textron Aviation OEM part conforming to a military standard, this O-ring is specified for numerous high-temperature fluid connections on their aircraft fleet and across the wider aerospace industry.

  • Primary Textron Aviation Platforms:

    • Cessna Citation Series Business Jets

    • Beechcraft King Air Series

    • Hawker Business Jets

  • General Aerospace Usage: Used in any aerospace application requiring a MIL-PRF-83248/1 compliant FKM O-ring in the AS568-026 size for fuel, oil, or petroleum-based hydraulic systems.

Note: Verification of applicability is the responsibility of the installer. Always consult the current version of the aircraft or engine's Illustrated Parts Catalog (IPC) to confirm part number eligibility.

Applications

  • Static sealing in high-temperature zones such as firewall-forward components.

  • Connections on engine accessories: fuel controls, oil filters, hydraulic pumps.

  • Hydraulic and fuel lines near hot engine components or bleed air ducts.

  • Landing gear system components using petroleum-based fluids.

  • Any static seal application where temperatures exceed the limits of Nitrile (NBR) and petroleum fluid compatibility is required.

Why Choose this M83248/1-026?

This component provides the dual assurance of meeting the public military specification and the specific endorsement of Textron Aviation. Material selection for seals is flight-critical. Substituting a lower-temperature Nitrile (NBR) O-ring where FKM is specified will lead to rapid thermal degradation, hardening, cracking, and catastrophic fluid leakage. Using the genuine OEM M83248/1-026 guarantees you are installing the correct, certified high-temperature material required by the aircraft's design for a safe and airworthy installation.

The exceptional performance of the M83248/1-026 O-ring is rooted in the molecular structure of its Fluorocarbon (FKM) elastomer. FKM is a family of synthetic rubbers based on fluorinated hydrocarbon polymers, most commonly vinylidene fluoride (VDF). The key to its thermal and chemical stability is the presence of strong carbon-fluorine (C-F) bonds, which are significantly stronger and more stable than the carbon-hydrogen (C-H) bonds that form the backbone of general-purpose elastomers like Nitrile (NBR). This high bond energy makes the FKM polymer chain highly resistant to scission from thermal energy (heat) and attack by aggressive chemicals and oxidizing agents found in synthetic lubricants and fuels. This inherent chemical inertness and thermal stability are why Fluorocarbon, specified under MIL-PRF-83248, is the mandated material for static seals in aerospace applications that must reliably perform at temperatures approaching 400°F.

Note: This component has a finite shelf life defined by standards like ARP5316. The cure date marked on the packaging must be verified prior to installation. It is a single-use part; a new O-ring must be used every time a fitting is reinstalled. The port and fitting sealing surfaces must be impeccably clean and free of scratches or damage. The O-ring must be lubricated with clean system fluid before installation.

Documentation

The military specification governing this part is publicly available through the Department of Defense ASSIST database. OEM-specific application and installation data is contained within the Textron Aviation maintenance and parts manuals.