Aircraft Hydraulic Fluids

Aircraft Hydraulic Fluids

Aircraft hydraulic fluids transmit power and motion in the hydraulic systems that operate various aircraft components, including landing gear, flaps, brakes, and steering systems. 

Hydraulic fluid also serves as a lubricant and a coolant for aircraft hydraulic system components, helping to prevent wear and overheating.

PJi offers an expansive selection of aircraft hydraulic fluid to keep your aircraft flight ready. Our aviation specialists will help you find the best hydraulic fluids for your aircraft.

Castrol Brayco-Micronic-756-1QT
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$10.37/ea.
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Royco 756-1QT
Royco 756-1QT
Royco 756 Aircraft Hydraulic Fluid – MIL-PRF-5606, 1 Quart
Works with: 310, 320, 337 Skymaster, 340, 411, 414, 414A, 421, Caravan 406, Diamond & more...
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$15.00/ea.
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1 Gallon | 24 Quart Case | 5 Gallon | 55 Gallon Drum | 6 Gallon Case
Castrol Aero-40-1QT
Castrol Aero-40-1QT
MIL-H-5606
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$16.91/ea.
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Castrol Brayco-Micronic-756-1GL
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$39.79/ea.
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Royco 756-1GL
Royco 756-1GL
Royco 756 Aircraft Hydraulic Fluid – MIL-PRF-5606, 1 Gallon
Works with: 310, 320, 337 Skymaster, 340, 411, 414, 414A, 421, Caravan 406, Diamond & more...
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$48.89/ea.
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Additional Sizes Available:
1 Quart | 24 Quart Case | 5 Gallon | 55 Gallon Drum | 6 Gallon Case
Castrol Brayco-Micronic-756-12QT-Case
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$124.45/ea.
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Castrol Brayco-Micronic-756-5GL
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$155.99/ea.
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Castrol Aero-40-5GL
Castrol Aero-40-5GL
MIL-H-5606
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$177.99/ea.
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Castrol Brayco-Micronic-882-1 Quart
Castrol Brayco-Micronic-882-1 Quart
MIL-PRF-83282D, Amendment 1
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$12.38/ea.
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Royco 782-1QT
Royco 782-1QT
MIL-PRF-83282 - 1 Quart
Works with: Metro Merlin III, Metro Merlin IV, 206B3, 206L4, 206LT, OH-58, TH-67, Apache AH-64, AS365N Dauphin, HH-65A Dolphin & more...
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$15.49/ea.
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Castrol Brayco-Micronic-882-1GL
Castrol Brayco-Micronic-882-1GL
MIL-PRF-83282D, Amendment 1
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$40.81/ea.
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Royco 782-1GL
Royco 782-1GL
MIL-PRF-83282 - 1 Gallon
Works with: Metro Merlin III, Metro Merlin IV, 206B3, 206L4, 206LT, OH-58, TH-67, Apache AH-64, AS365N Dauphin, HH-65A Dolphin & more...
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$68.99/ea.
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Castrol Brayco-Micronic-882-12QT-Case
Castrol Brayco-Micronic-882-12QT-Case
MIL-PRF-83282D, Amendment 1
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$148.68/ea.
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Castrol Brayco-Micronic-882-5GL
Castrol Brayco-Micronic-882-5GL
MIL-PRF-83282D, Amendment 1
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$175.81/ea.
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Castrol 881-QT
Castrol 881-QT
MIL-PRF-87257B - 1 Quart
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$16.19/ea.
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Castrol Brayco-Micronic-881-1QT
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$16.20/ea.
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Castrol Aero-35-Yellow-1QT
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$16.42/ea.
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Castrol Aero-35-Yellow-5GL
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$185.92/ea.
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Eastman 500B4-QT
Eastman 500B4-QT
Skydrol 500B-4 Aviation Hydraulic Fluid, 1 Quart
Works with: Bravo, 737-BBJ, 737-BBJ2, Challenger 300, Challenger 600, Challenger 601, Challenger 604, Challenger 605 (CL605), Challenger 850, Global Express & more...
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$48.50/ea.
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Eastman LD4-1GL
Eastman LD4-1GL
Skydrol LD-4 Aviation Hydraulic Fluid, 1 Gallon
Works with: Bravo, 737-BBJ, 737-BBJ2, Challenger 300, Challenger 600, Challenger 601, Challenger 604, Challenger 605 (CL605), Challenger 850, Global Express & more...
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$183.49/ea.
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Aviation Hydraulic Fluid – Skydrol, 5606, MIL-SPEC

Whether you’re looking for Skydrol hydraulic fluid, 5606 hydraulic fluid, or MIL-SPEC hydraulic fluid, PJi has got you covered!

What are the three most common types of aircraft hydraulic fluid?

There are three main types of hydraulic fluids used in aircraft:

  • Mineral oil-based fluids (5606, 83282)
  • Synthetic hydrocarbon-based fluids (87257, AeroShell Fluid 31)
  • Phosphate ester-based fluids (Skydrol, Hyjet)

The type of hydraulic fluid used depends on the specific requirements of the aircraft’s hydraulic system, including temperature range, operating pressure, and compatibility with other materials.

Mineral oil-based fluids are used in most general aviation and commercial aircraft. Synthetic fluids are used in some military and high-performance aircraft because they offer better performance at high temperatures and pressures. Phosphate ester-based fluids are used in some military and commercial aircraft due to their fire-resistant properties.

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