NAS1611-017 - Textron Aviation OEM Preformed Packing O-Ring

NAS1611-017 – Textron Aviation OEM Preformed Packing O-Ring

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Overview

The NAS1611-017 is a National Aerospace Standard, high-performance O-ring engineered for demanding sealing applications in aircraft fuel, oil, and hydraulic systems. Manufactured in strict accordance with the NAS1611 specification, this preformed packing seal is fabricated from a high-quality, 75-durometer Fluorocarbon (FKM) elastomer, commonly known by the trade name Viton®. This advanced material is specified for its excellent resistance to petroleum-based fluids and its ability to maintain sealing integrity at higher temperatures than standard Nitrile seals. As a certified aerospace component specified by Textron Aviation, the NAS1611-017 is a flight-critical seal for ensuring the leak-free integrity of numerous fluid systems.

Key Features

• High-Performance Fluorocarbon (FKM) Material: Fabricated from a Viton® (FKM) elastomer, providing superior performance in moderate-to-high temperature environments and excellent resistance to petroleum-based oils, jet fuels, and most hydraulic fluids.
• Excellent Fluid Compatibility: Offers low swell and resistance to chemical degradation when exposed to a wide array of aviation fluids, ensuring a durable, long-lasting seal that will not harden or break down prematurely.
• NAS Certified Standard: As a certified National Aerospace Standard part, it guarantees that the material compound, physical properties (like its 75-durometer hardness and compression set), and dimensional tolerances meet the highest standards for aviation safety and reliability.
• Precision Dimensions: The "-017" dash number corresponds to a specific dimensional standard (AS568), which ensures a perfect fit into glands designed for this O-ring size, providing a reliable seal under system pressure.
• OEM Specification: A genuine component specified by Textron Aviation for use in their aircraft, guaranteeing the part meets the original performance and quality requirements of the aircraft's certified design.

Technical Specifications

• Standard: NAS1611 (Packing, Preformed, Hydraulic, 75 Durometer)
• Full Part Number: NAS1611-017
• Material: Fluorocarbon Rubber (FKM / Viton®)
• Durometer (Hardness): 75 Shore A
• Color: Black
• AS568 Dash Size: -017
• Nominal Dimensions:
  • Inside Diameter (I.D.): 0.739 inches
  • Cross Section (C.S.): 0.070 inches
• Operating Temperature Range: Approximately -15°F to 400°F (-26°C to 204°C)
• Primary Fluid Compatibility: Petroleum-based oils, fuels (Jet A, 100LL), and hydraulic fluids (MIL-H-5606).

Aircraft Compatibility

The NAS1611-017 O-ring is a standard seal used in numerous applications across the entire spectrum of aviation, including many Textron Aviation (Cessna, Beechcraft) aircraft. Its use is determined by the specific requirements of the component it seals, particularly where temperatures may exceed the limits of standard Nitrile seals.

• Common Applications:
  • Engine & Firewall Forward: Used as seals in fuel pumps, propeller governor systems, lubrication systems, and accessory gearbox housings that experience higher operating temperatures.
  • Hydraulic Systems: Utilized in hydraulic pumps, actuators, and valves where system temperatures are elevated.
  • Fuel Systems: Seals for fuel line fittings, connectors, and fuel control units.

Applications

The NAS1611-017 is the specified sealing solution where higher performance is required:

• Elevated Temperature Sealing: Its primary application is in joints that must maintain a reliable seal at continuous operating temperatures that are too high for standard Buna-N (Nitrile) O-rings.
• Static & Dynamic Sealing: The 75-durometer hardness provides a good balance for use in both static face seals (e.g., flanges) and some dynamic reciprocating seals (e.g., pistons).
• Component Overhaul: A mandatory replacement item during the overhaul of any high-performance fuel, oil, or hydraulic component.

Why Choose NAS1611-017?

Choosing the correct O-ring material is critical for flight safety. An O-ring failure can lead to a critical leak of fuel, oil, or hydraulic fluid. The NAS1611-017, made from Fluorocarbon (FKM), is specifically designed to perform in high-temperature and chemically demanding environments where a standard Nitrile O-ring would fail. Using a genuine, certified NAS-standard part is the only way to ensure the O-ring has the correct, tested material properties for the demanding conditions of flight.

Order Your NAS1611-017 O-Rings Now

Ensure the integrity of your aircraft's critical fluid systems with certified, high-performance seals. Visit Airparts.aero to order your NAS1611-017 O-rings today.

The NAS1611-017 O-ring's Fluorocarbon (FKM) polymer chemistry provides its key performance advantages. The strong carbon-fluorine bonds in its molecular structure give the material its exceptional thermal stability and resistance to chemical attack from non-polar hydrocarbon fluids like fuel and oil. It offers a significant upgrade in temperature capability over standard Nitrile (Buna-N), which is typically limited to around 250°F. This makes the NAS1611 series the standard choice for sealing applications in and around the engine compartment where higher ambient and fluid temperatures are common. The 75-durometer hardness provides a more robust seal that is less prone to damage during installation compared to softer materials.

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.