NAS1612-006A – Textron Aviation OEM Fluorosilicone O-Ring Seal
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Overview
The NAS1612-006A is a specialized, high-performance O-ring packing seal, supplied with the full certification and traceability of Textron Aviation as an Original Equipment Manufacturer (OEM) component. This is not a standard Nitrile O-ring; it is manufactured to the precise National Aerospace Standard (NAS1612) from a Fluorosilicone (FVMQ) rubber compound. This advanced elastomer is specifically chosen for its exceptionally wide operational temperature range, particularly its superior flexibility at extremely low temperatures where other materials would become brittle and fail.
Identifiable by its distinctive blue color, the NAS1612-006A is engineered for static sealing applications in aircraft fuel, oil, and hydraulic systems that are exposed to both high heat and the deep cold of high-altitude flight. As a genuine Textron Aviation part, it is the factory-specified seal for numerous critical connections on Cessna, Beechcraft, and Hawker aircraft, ensuring system integrity across the entire flight envelope.
Key Features
Fluorosilicone (FVMQ) Compound: Fabricated from a specialized elastomer that combines the extreme temperature stability of silicone with the fuel and oil resistance of fluorocarbons.
Extreme Low-Temperature Flexibility: Maintains its sealing properties at temperatures as low as -85°F (-65°C), preventing leaks caused by cold-soaking of fuel system components at altitude.
Jet Fuel and Oil Resistant: Provides excellent long-term resistance to swelling and degradation from jet fuels (Jet A, A1, JP-8), petroleum-based hydraulic fluids, and synthetic lubricating oils.
Designed for Static Applications: Engineered to provide a durable, leak-free seal between two stationary surfaces, such as a fitting and a housing, or a cover and a body.
Distinctive Blue Color: The blue pigment serves as a positive visual identifier for the Fluorosilicone material, preventing accidental installation of an incorrect (e.g., black Nitrile) O-ring.
Textron Aviation OEM Certified: Guarantees the component is a factory-approved, fully traceable part for the Textron Aviation family of aircraft.
Technical Specifications
Part Number: NAS1612-006A (conforming to the NAS1612-006 standard)
Component Type: Preformed O-Ring Packing Seal
Governing Specification: NAS1612
OEM Authority: Textron Aviation
Material: Fluorosilicone Rubber (FVMQ)
Hardness: 70-80 Durometer Shore A (75 nominal)
Color: Blue
Dimensions (AS568-006):
Inside Diameter (ID): 0.114 inches
Cross-Section (CS): 0.070 inches
Typical Temperature Range: -85°F to +400°F (-65°C to +204°C)
Aircraft Compatibility
As a Textron Aviation OEM part, this seal is specified for critical fuel and hydraulic system applications across their product lines. The underlying NAS standard makes it common in many other advanced aircraft.
Primary Textron Aviation Platforms:
Cessna Citation Series Business Jets
Beechcraft King Air, Premier, and Starship Series
Hawker Business Jets
General Aerospace Usage: Used in any aerospace application requiring a static seal with exceptional low-temperature performance and fuel resistance.
Note: Verification of applicability is the responsibility of the installer. Always consult the current version of the aircraft's Illustrated Parts Catalog (IPC) and maintenance manual to confirm part number eligibility for a specific location.
Applications
Static sealing in fuel system components: fuel control units (FCUs), fuel quantity probes, fuel pumps, drain valves, and electrical connectors.
Sealing in hydraulic and lubricating oil system components that are subject to extreme temperature ranges.
Ideal for any stationary seal that must perform reliably from arctic ground conditions to high-altitude cruise.
Why Choose NAS1612-6A?
The choice of an O-ring's elastomer is a critical engineering decision. In applications where this seal is specified, substituting a standard black Nitrile (NBR) O-ring would create a significant safety hazard, as the NBR would harden at low temperatures, lose its seal, and cause a major fuel or hydraulic leak. Choosing the genuine Textron Aviation OEM NAS1612-006A guarantees you are installing the correct, certified Fluorosilicone material required to maintain system integrity and flight safety under all temperature conditions.
The unique performance of the NAS1612-006A is a direct result of its advanced polymer science. Its Fluorosilicone (FVMQ) elastomer is a synthesized polymer featuring a polysiloxane backbone. This (-Si-O-) atomic structure is responsible for the material's exceptionally low glass transition temperature and thermal stability, providing a wider operational temperature range than any hydrocarbon-based rubber. To counteract the inherent weakness of standard silicone to hydrocarbon fuels, trifluoropropyl groups are attached to the siloxane chain. These fluorine-containing groups impart a strong polarity to the polymer, making it highly resistant to swelling, softening, and chemical attack from non-polar fluids like jet fuel. This molecular engineering creates a hybrid material that possesses the best qualities of both silicones and fluorocarbons, making it the optimal choice for static seals in aerospace fuel systems.
Note: This component has a finite shelf life (cure date) as defined by standards like ARP5312. This date must be verified prior to installation. Due to the relatively low tear strength of Fluorosilicone, extreme care must be taken during installation to avoid stretching or damaging the O-ring on sharp edges or threads. This is a single-use part and is intended for static sealing applications only.
Documentation
The base standard for this part is the National Aerospace Standard NAS1612. This is a controlled document managed by the Aerospace Industries Association (AIA). OEM-specific application and installation data is contained within the Textron Aviation maintenance manuals.