MS29513-241 – Aerospace Preformed O-Ring
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Overview
The MS29513-241 is a military-standard, preformed packing O-ring engineered specifically for reliable sealing in aircraft fuel systems. Manufactured in strict accordance with the MS29513 and MIL-P-5315 specifications, this O-ring is fabricated from a high-quality Nitrile (Buna-N) rubber compound. This material is formulated to provide exceptional resistance to hydrocarbon fuels, including jet fuels and aviation gasoline. The MS29513-241 is a critical sealing component used to prevent leaks in fuel lines, fittings, and engine components, ensuring the safety and integrity of the aircraft's fuel system.
Key Features
- Hydrocarbon Fuel Resistance: Fabricated from a specialized Nitrile (Butadiene-Acrylonitrile, NBR) compound, providing superior resistance to swelling, hardening, and degradation when exposed to aviation fuels like Jet A, JP-4, JP-5, and 100LL Avgas.
- Reliable Sealing Performance: Designed to provide a durable, positive seal in both static and low-pressure dynamic applications, preventing fuel leakage which can be a significant fire hazard.
- MS Certified Standard: As a certified Military Standard part, it guarantees the material compound, dimensional tolerances, and physical properties (such as durometer) meet the stringent requirements for use in certified aircraft.
- Wide Temperature Range: Engineered to maintain its sealing integrity and flexibility across a broad temperature range, typically from -65°F to 200°F (-54°C to 93°C).
- Precise Dimensions: The "-241" dash number corresponds to a specific dimensional standard (AS568), guaranteeing a perfect fit in glands and grooves designed for this O-ring size.
Technical Specifications
- Standard: MS29513 / MIL-P-5315
- Full Part Number: MS29513-241
- Material: Nitrile Rubber Compound (Buna-N, NBR)
- Durometer (Hardness): 70 Shore A
- Color: Black
- AS568 Dash Size: -241
- Nominal Dimensions:
- Inside Diameter (I.D.): 3.859 inches
- Outside Diameter (O.D.): 4.125 inches (4-1/8")
- Cross Section (C.S.): 0.139 inches (approx. 1/8")
- Primary Fluid Compatibility: Hydrocarbon Fuels (Jet Fuel, Avgas), Petroleum-Based Oils & Greases.
Aircraft Compatibility
The MS29513-241 is a standard O-ring used in fuel system components across a vast array of general aviation, business, and military aircraft, including many models from Textron Aviation, Bombardier, and others. Its use is determined by the specific design of the component it is sealing.
- Common Applications:
- Fuel Tank Systems: Sealing access panels, fuel quantity transmitters, and drain valves.
- Fuel Line Fittings: Used as the primary seal in various types of fuel line connectors and fittings.
- Engine Components: Serves as a seal in fuel pumps, fuel control units, and primers.
- Fuel Filter Assemblies: Provides the seal for fuel filter bowls and bypass valves.
Applications
The MS29513-241 is the specified sealing solution for numerous fuel system requirements:
- Static Sealing: Ideal for creating a leak-proof seal between two stationary, mated surfaces, such as flanges.
- Low-Pressure Dynamic Sealing: Suitable for use in applications with slow or infrequent movement.
- Component Overhaul & Repair: A mandatory replacement item whenever a fuel system component is disassembled for inspection, repair, or overhaul.
Why Choose MS29513-241?
Fuel leaks pose one of the most significant fire and safety risks in aviation. The integrity of every seal in the fuel system is paramount. Using a genuine MS29513-241 O-ring guarantees that the seal is made from the correct Nitrile compound, specifically formulated and tested for long-term compatibility with aviation fuels. Substituting with a non-certified or commercial-grade O-ring made from the wrong material (e.g., EPDM) can lead to rapid swelling, softening, and catastrophic failure of the seal. For any fuel system maintenance, trust only certified Mil-Spec seals.
Order Your MS29513-241 O-Rings Now
Ensure the leak-free integrity of your aircraft's fuel system with certified, high-performance seals. Visit Airparts.aero to order your MS29513-241 O-rings today.
The MS29513 standard specifies O-rings made from a Nitrile (Buna-N) compound with a 70 Shore A durometer hardness. This specific hardness provides an excellent balance of properties for fuel system sealing. It is soft enough to conform to surface imperfections to create a positive seal under low pressure, yet resilient enough to resist extrusion and damage when system pressures increase. The Nitrile polymer's molecular structure, rich in acrylonitrile, makes it highly resistant to non-polar solvents like gasoline and kerosene (jet fuel). This prevents the O-ring from swelling excessively or breaking down chemically, ensuring it maintains its physical properties and sealing force throughout its entire service life.
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 (e.g., fuel or approved lubricant) to prevent damage during assembly. Never use tools that could nick or scratch the O-ring or sealing surfaces.
