AN834-2D - Textron Aviation OEM Aluminum Bulkhead Tee Fitting

AN834-2D – Textron Aviation OEM 1/8" Aluminum Bulkhead Tee Fitting, 37° Flare

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Overview

The AN834-2D is a high-quality, AN-standard bulkhead tee fitting, supplied with the full certification and traceability of Textron Aviation as an Original Equipment Manufacturer (OEM) component. This precision-machined fitting is designed to perform two critical functions simultaneously: to create a three-way junction for 1/8-inch tubing, and to provide a secure, fixed pass-through point for a fluid line on a firewall, instrument panel, or structural rib.

Fabricated from high-strength 2024 aluminum alloy and finished with a distinctive blue anodization, this fitting is engineered for use in low-pressure fuel, oil, and instrument line applications. All three ports feature the standard 37° flared male cone, which creates a robust metal-to-metal seal when mated with a corresponding flared tube and AN B-nut. As a genuine Textron OEM part, it guarantees the precise dimensions and material specifications required for an airworthy installation.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring a perfect fit and uncompromising safety.

• Bulkhead Pass-Through Design: Features a longer body and threads on one of the run ports, allowing it to be securely mounted through a panel with a locknut (e.g., AN924) to create a rigid fluid connection point.

• Tee-Configuration: Allows a single fluid line to be split into two, or for two lines to be joined into one, providing a junction for complex plumbing runs.

• 37° Flared Sealing Surface: The AN-standard 37° male flare provides a time-tested, highly reliable metal-to-metal seal when properly torqued against a flared tube.

• High-Strength 2024 Aluminum Alloy: Machined from a solid bar of 2024-T351 or -T4 aluminum alloy, offering an excellent strength-to-weight ratio for aerospace applications.

• Blue Anodized for Identification: The blue anodized finish provides corrosion resistance and serves as the industry standard color code for aluminum fittings intended for petroleum-based fluid systems.

Technical Specifications

• Part Number: AN834-2D

• Component Type: Bulkhead Flared Tube Tee Fitting

• OEM Authority: Textron Aviation

• Governing Specification: AN834

• Material: 2024-T351 or -T4 Aluminum Alloy

• Finish: Blue Anodize per MIL-A-8625, Type II, Class 2

• For Tube Outside Diameter: 1/8 inch (-2 size)

• Thread Specification: 5/16-24 UNF

• Sealing Angle: 37° Flare

Aircraft Compatibility

The AN834-2D is a standard hardware component used across the general aviation industry, particularly on Textron Aviation's piston and light turbine aircraft.

• Primary Textron Aviation Platforms:

  • Cessna Piston Aircraft (100, 200, 300, 400 Series)

  • Beechcraft Piston Aircraft (Bonanza, Baron)

  • Cessna Caravan Series

• General Aerospace Usage: Used in any certified aircraft requiring a -2 size aluminum bulkhead tee for instrument, fuel, or vent lines.

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.

Applications

• Creating a secure, firewall or panel pass-through junction for low-pressure fluid and pneumatic lines.

• Commonly used for fuel pressure, oil pressure, and manifold pressure instrument lines.

• Used in primer systems and fuel tank vent line plumbing.

Why Choose this AN834-2D?

The integrity of an aircraft's fluid lines is a critical safety-of-flight concern. AN fittings are a precision-engineered system where the 37° flare angle, thread class, and material specifications are non-negotiable. Using a non-certified or incorrect industrial fitting (such as a 45° flare fitting common in automotive use) will create a dangerous sealing surface mismatch, guaranteeing a leak of flammable fluid or a loss of critical instrument readings. The genuine Textron OEM part ensures full compliance with the aircraft's original, type-certified design.

The 37° flared fitting system, of which the AN834-2D is a part, is the cornerstone of aerospace fluid conveyance due to its exceptional reliability. The sealing mechanism is a high-pressure, metal-to-metal contact between the male cone of the fitting and the female cone of the flared tube end. The 37° flare angle was specifically chosen over the 45° angle used in other industries for several engineering reasons. The shallower 37° cone provides a larger sealing surface area for a given tube size, which distributes the compressive force from the B-nut more effectively. This reduces the stress on the flare, making it far more resistant to cracking and failure from the high-frequency vibrations endemic to aircraft. This robust design is what allows the AN standard flared fitting to reliably contain fluids from vacuum up to pressures of 3,000 PSI.

Note: This is a flight-critical fluid fitting. Installation must be performed by a certified A&P mechanic. It requires mating with properly flared tubing and the correct AN B-nuts (AN818) and sleeves (AN819). The bulkhead locknut (AN924) must also be the correct size. Fittings must be torqued to the value specified in the maintenance manual (e.g., FAA AC 43.13-1B) to ensure a proper seal without over-stressing or cracking the tube flare.

Documentation

The base standard for this part is maintained by SAE International, which now manages many of the legacy AN standards. OEM-specific application and installation data is contained within the Textron Aviation maintenance and parts manuals.