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MIL-SPEC Hydraulic Fluid

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MIL-SPEC Hydraulic Fluid

Commercial Hydraulic Fluid


Spec Short Product Description Products
Hydraulic Fluid MIL-PRF-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile & Ordinance Royco 756
Fluid 4
Fluid 41
Brayco Micronic 882
Hydraulic Fluid MIL-PRF-6083 Hydraulic Fluid, Petroleum Base Preservative Brayco Micronic 783
Hydraulic Fluid MIL-PRF-7024E II Used in the calibration of aircraft fuel system components. Brayco 922
Hydraulic Fluid MIL-DTL-17111 Hydraulic Fluid, for use in the hydraulic transmission of power. Brayco 717
Hydraulic Fluid MIL-PRF-17672 Lubricating Oil, Hydraulic & Light Turbine, Non Corrosive, Symbols 2075th, 2110th and 2135th
Hydraulic Fluid MIL-H-46001 Hydraulic fluid (Petroleum Base for Machine Tools Grades 1, 2, 3, & 4 QC Hydraulic Anti-wear
Hydraulic Fluid MIL-PRF-46170 Hydraulic Fluid, Rust Inhibited, Fire Resistant, Synthetic Hydrocarbon Base Brayco Micronic 883
Hydraulic Fluid MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft Royco 782
Brayco Micronic 882
Hydraulic Fluid MIL-PRF-87257 Hydraulic fluid, fire resistant; low temperature, synthetic hydrocarbon base, aircraft and missile Brayco Micronic 881



Hydraulic fluids are a large group of liquids made of many kinds of chemicals.
Some of the most commonly used fluids are synthetic lubricants, petroleum oils, oil-water emulsions, and water-glycol mixtures. The main characteristics of hydraulic fluid are proper viscosity, high viscosity index, anti-wear protection, if applicable, proper oxidation, proper pour point, rust inhibition, good demulsibility, foaming resistance, and compatibility with seal materials. Anti-wear oils are used in compact, high-pressure, and capacity pumps that require extra lubrication protection. They are used in auto transmissions, power steering and brakes. They are used in forklift trucks, power steering and brakes. They are used in Tractors, bulldozers, aircraft and industrial machinery.
Some common types of hydraulic fluids are mineral oil, organophosphate ester, polyalphaolefin, castor oil, silicone, glycol esters and ethers.

Hydraulic fluids can contain a wide range of chemical compounds; oils, butanol, esters (e.g. phthalates, like DEHP, and adipates, like bis (2-ethylhexyl) adipate), polyalkylene glycols (PAG), phosphate esters (e.g. tributylphosphate), silicones, alkylated aromatic hydrocarbons, polyalphaolefins (PAO) (e.g. polyisobutenes), corrosion inhibitors, etc.
Farm tractors and marine dredging may benefit from using biodegradable hydraulic fluids based upon varieties of vegetable oil since they are environmentally sensitive, and when there is the risk of an oil spill from a ruptured line. These oils are available in their designated military specifications. Hydraulic systems will work efficiently if the specific hydraulic fluid has low compressibility.
Brake fluid is a type of hydraulic fluid with a high boiling point and low freezing point.
Some hydraulic fluids have an oily smell and others have no smell. Some are flammable and some are not.