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High Performance Flexible Metal Hoses

FMH Aerospace’s Flexible Metal Hose Assemblies are all-metallic, corrugated hose products engineered for extreme aerospace environments. These build-to-print and custom-designed hoses are designed to withstand high pressures, extreme temperatures, and intense vibration without failure,

Each flexible metal hose assembly is constructed from a thin-walled formed bellows core with one or more
layers of braided metal wire reinforcement, plus precision-machined end fittings. This robust construction gives the hose exceptional tolerance to high-pressure and high-vibration conditions. The all-metal design also provides inherent fire resistance, ensuring safe performance even in high-heat or flame environments (no organic liners are used). FMH hoses operate effectively from deep vacuum to high pressure and from cryogenic to high-temperature regimes, covering a broad performance envelope.  

Data Sheet for Flexible Metal Hoses Download a Data Sheet

Built for Cryogenic to Ultra-High Temperatures

Parameter Specification
Size Range 1/4” to 10” ID (6.4 mm to 254 mm)
Pressure Range Vacuum (10⁻⁴ Torr) to 15,000 psi (103 MPa)
Temperature Range –423 °F to +1200 °F (–253 °C to +650 °C)
Materials Stainless Steel, Inconel, or Titanium (all-metal construction)
Construction Corrugated metal bellows with 1–4 braided layers; optional rigid tube sections
Standard Compliance Meets SAE AS1424 (Medium-Pressure, High-Temperature Metal Hose Assemblies)

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Fuel Hose Assemblies
Fuel Hose Assemblies
Liquid Oxygen Line
Liquid Oxygen Fuel Line
Flexible Hose Assembly
Flexible Hose Assembly
Hose Assembly
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Applications

Aircraft Fluid Transfer
  • Fuel Lines
  • Hydraulic Lines
  • Bleed Air Systems
  • Environmental Control System Ducts
  • Coolant Lines
  • Wing and tail anti-ice transfer product
Space Launch Vehicles
  • Fuel feed lines
  • Oxidizer feed lines
  • Purge lines
  • Fill and drain lines
  • Pressurization lines
  • Vent lines
Missiles and Defense Systems
  • Environmental control systems (ECS)
  • Bleed air tubes, ducting and hoses
  • Fuel lines and hoses
  • Hydraulic fluid tubes and hoses
  • APU Exhaust
  • Wing and tail anti-ice transfer product
  • Water and waste water transfer product
  • Fire suppression system tubes and hoses
  • Drain lines
  • Vent lines
Industrial Gas Turbines
  • Fuel Hose Assemblies
  • Lubrications Oil Hoses & Tubes
  • Fire Suppression Lines

Testing and Quality

FMH ensures the quality and reliability of its products through a rigorous, multi‑layered testing and inspection process designed to meet demanding aerospace requirements. Each flight hose assembly is pressure tested well above its maximum operating pressure to verify structural integrity and safety margins, with critical units pushed to burst during qualification. To guarantee leak‑tight performance, FMH performs in‑house helium mass‑spectrometer leak testing, capable of detecting microscopic leaks at extremely low acceptable rates.

Critical components are further validated using non‑destructive examination methods such as X‑ray and dye penetrant inspection to uncover hidden weld defects or surface cracks before final assembly. Finished hose assemblies are then subjected to vibration and flex testing that simulates launch, mission motion, and long‑term fatigue, ensuring they maintain integrity, do not loosen or chafe, and remain leak‑free throughout their service life.

 

Certifications

AMETEK FMH is a AS9100/ISO9001 and NADCAP certified supplier. Our certifications including welding, non-destructive testing and heat-treating can be downloaded here.

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  • Overview +


    - Excellent performance in high-pressure, high-temperature, and high-vibration environments
    - 1/4" to 10" ID
    - 100% in-house production of Bellows, Braids, Tubes, and Couplings
    - Bellows manufacturing processes with consistent convolution pitch, height and wall thickness

  • Application +


    Used in the conveyance of fluids and air in high vibration environments
    • Airframe level:
    - High pressure, high temperature seals and joints
    • Engine level:
    - Exhaust seals, bleed air applications
    • System level:
    - Used in Ball Joints, Gimbals, and Flexible Metal Hoses
    - Conveyance of air and fluids in high vibration areas 

    CONSTRUCTION
    - Fully metallic, from Stainless Steel, Inconel or Titanium
    - Rolled and welded, pressure formed • May be seamless if required
    - Temperature ranges from -420 °F to +1,200 °F (-251 °C to +649 °C)
    - From 1-4 layers as needed
    - Size ranges from ¼” – 36” ID (0.64 cm – 91.33 cm ID)
    - May include braid wire or in combination with ducting where needed 

    FEATURES
    - Fire-resistant
    - Custom designed to applications, including qualification testing, or built to print

    PERFORMANCE
    - Pressure ranges up to 5,000psi in fluid, up to 16,000psi in air

    WHERE USED
    - In Bleed Air Ball Joints from 1.5” to 4” in various commercial engine applications
    - Exhaust Seals in 1” to 4” in length and from 6” to 36” in diameter, typically in Inconel

  • Product Data Sheet Download +