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MIL-PRF-87257

MIL-PRF-87257 is a military specification for a type of hydraulic fluid used in aircraft and missiles. The fluid must meet specific requirements for viscosity, flash point, autoignition temperature, and other physical and chemical properties to ensure it performs effectively in demanding military applications. Fluids that comply with this spec are subject to rigorous testing and quality control measures to ensure they meet these stringent performance standards. This hydraulic fluid is identified by Nato Code number: H-538.

MIL-PRF-87257 Product List

Please consult the product page and product description for the specific grade/size you intend to purchase to ensure it will be supplied with MIL-PRF-87257 paperwork.

Castrol Brayco Micronic 881 Hydraulic Fluid
Castrol Brayco Micronic 881 Hydraulic Fluid
Silmid P/N: 
VAR0000607
No Stock - Standard lead time 38 business days
From £299.51 excl VAT
View Details
Nyco Hydraunycoil FH 42
Nyco Hydraunycoil FH 42
Silmid P/N: 
VAR0000824
In Stock
From £25.30 excl VAT
View Details

List of Revisions

RevisionDetails
MIL-PRF-87257AEstablished Dec 1997, Superseding the previous spec, MIL-H-87257, where MIL = Military, H = Hydraulic fluid, 87257 = Unique identification number for this spec
MIL-PRF-87257BThis version superseded MIL-PRF-87257A in April 2004
MIL-PRF-87257CThis version of the spec was established in June 2017, superseding MIL-PRF-87257B
MIL-PRF-87257DThe most recent version of the spec. Established in February 2022

Key characteristics:

  • Fire resistant: This is a critical property for aircraft and missile applications where flammability could be catastrophic

  • Temperature performance: The fluid is designed to function well in cold environments, down to -54°C. It has a wide temperature range, also withstanding +200°C at the upper level.

  • Synthetic hydrocarbon base: The fluid is made from synthetic materials derived from petroleum

  • Colour: MIL-PRF-87257 fluid is characterised by the colour red

  • Non-Aromatic: The fluid is non-aromatic, which contributes to lower toxicity and better environmental and health safety

  • Durability: Superior oxidative and thermal stability ensure long service life and reduce maintenance costs


Drum, can and tin, Nyco FH 42 packaging.

Summary

Manufacturers producing hydraulic fluids to meet MIL-PRF-87257 must undergo rigorous testing to ensure compliance with the specification. This includes testing for physical and chemical properties, as well as performance under simulated operational conditions. MIL-PRF-87257 sets the standard for high-performance hydraulic fluids used in demanding military applications. Its stringent requirements ensure that hydraulic systems remain operational under extreme temperatures, resist fire, and provide reliable performance in mission-critical scenarios.