EB-126 – Textron Aviation OEM High Tensile Double Hex Nut
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Overview
The EB-126 is a genuine OEM, ultra-high-temperature, 12-point self-locking nut, an essential piece of hardware for the most demanding, flight-critical applications in modern jet aircraft. Manufactured by industry leaders like SPS Technologies and specified by Textron Aviation, this nut is precision-machined from Inconel 718, a nickel-based superalloy. It is engineered to maintain its exceptional strength and reliable self-locking capability at extreme temperatures where conventional steel and even A-286 CRES nuts would fail. The EB-126 is the specified fastener for use in turbine engine hot sections and other critical high-temperature structural joints.
Key Features
- Inconel 718 Superalloy Construction: Fabricated from Inconel 718 (UNS N07718), a precipitation-hardenable nickel-chromium alloy. This material is renowned for its immense tensile strength, and its ability to resist creep and stress rupture at extreme temperatures.
- 1200°F Temperature Rating: Engineered to maintain its mechanical properties and locking torque at continuous operating temperatures up to 1200°F (649°C), making it essential for use inside the turbine engine compartment.
- 12-Point Double Hexagon Drive: The 12-point head design allows for the application of very high torque with reduced risk of wrench slippage. This enables the proper preloading of high-strength bolts and provides superior tool access in confined spaces.
- All-Metal Self-Locking Design: Features a deformed-thread prevailing torque locking mechanism. This robust, all-metal design provides a consistent and reusable locking action that is completely unaffected by extreme heat.
- Silver Plated Finish: Silver plating is applied to the threads to act as a high-temperature anti-galling agent. This prevents the nut and bolt threads from seizing together under extreme heat and pressure, allowing for proper torquing and eventual removal during maintenance.
Technical Specifications
- Part Number: EB-126
- Standard: Conforms to SPS Technologies EB series standard
- Component Type: 12-Point, All-Metal, High-Temperature Self-Locking Nut
- Material: Inconel 718 (UNS N07718)
- Finish: Silver Plated
- Head Style: 12-Point Double Hexagon
- Thread Specification: 3/8-24 UNJF-3B
- Nominal Diameter: 3/8 inch (0.375 inches)
- Threads Per Inch: 24 (Fine Thread, with controlled root radius)
- Maximum Operating Temperature: 1200°F (649°C)
- Certification: FAA Production Approval with full material and process traceability.
Aircraft Compatibility
The EB-126 nut is specified for use in the most critical, high-temperature structural joints on high-performance jet aircraft, including those manufactured by Textron Aviation.
- Common Aircraft Platforms:
- Textron Aviation (Cessna Citation series)
- Other business jets, commercial airliners, and military aircraft with turbine engines.
- Common Applications:
- Turbine Engine Hot Sections: Securing components like combustor cases, turbine housings, and exhaust plenums.
- Engine Mounts & Pylons: Used in firewall-forward applications where the fasteners are exposed to high engine heat.
- High-Temperature Bleed Air Systems: Fastening clamps and flanges on high-pressure, high-temperature bleed air ducts.
Applications
The EB-126 is the specified fastening solution when no other locknut can withstand the environment:
- Extreme Temperature Joints: Its primary function is to maintain clamp load and locking action in joints exposed to the highest temperatures on the aircraft.
- Critical High-Strength Connections: Used to secure high-strength bolts where joint integrity is absolutely essential for safety of flight.
Why Choose EB-126?
In the hot section of a turbine engine, temperatures can easily exceed the operational limits of both nylon-insert (250°F) and standard all-metal (450°F) locknuts, causing them to lose their locking ability and strength. The EB-126, made from Inconel 718, is specifically engineered to thrive in this environment. Using a genuine, traceable EB-126 is the only way to ensure the fastener will perform its function without failing due to thermal degradation. For the most critical, high-heat applications on your aircraft, there is no substitute for the certified performance of an Inconel superalloy nut.
Order Your EB-126 Nuts Now
Secure your aircraft's most critical high-temperature joints with the ultimate in fastening technology. Visit Airparts.aero to order your genuine EB-126 Inconel self-locking nuts today.
The selection of Inconel 718 for the EB-126 nut is a deliberate choice based on advanced material science. Inconel 718 is a nickel-chromium superalloy that is precipitation-strengthened by the formation of gamma double-prime (Ni3Nb) intermetallic phases within its crystal structure during heat treatment. This unique microstructure gives it extraordinary strength and resistance to creep and stress-rupture at temperatures up to 1300°F (700°C), far surpassing other steels. The silver plating acts as a solid lubricant at these temperatures, preventing the nickel alloy threads of the nut from galling or "pressure-welding" to the threads of the mating bolt, which is a common problem with high-temperature alloys under high clamp loads.
Note: This is a flight-critical structural component. It must only be used where specified by the aircraft or engine manufacturer's maintenance manual. Installation requires the use of a calibrated torque wrench and a 12-point socket. Adherence to specified torque values and lubrication procedures is essential to achieve proper bolt preload.