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The guide below outlines a range of official specifications assigned to aerospace and defence hydraulic fluid products. It includes corresponding NATO codes, Joint Service Designations, French and UK equivalents, and airframe approvals where applicable.
Before ordering, always verify that the specific product and pack-size combination is certified for your required specification. Refer to your aircraft maintenance manual (AMM), component maintenance manual (CMM), or qualified products list (QPL) for final approval. This information may change at any time.
*Always confirm technical suitability with OEM data sheets before selecting or substituting a hydraulic fluid product.
Selecting the correct hydraulic fluid specification is critical for safety, performance, and regulatory compliance. Using a cross-reference chart helps maintenance teams:
In aerospace, defence, heavy industry, and energy sectors, correct specification identification is essential for both safety and operational consistency. Hydraulic systems operate under demanding conditions, and using the wrong fluid can compromise system integrity and lead to costly failures.
It is a guide that helps users match hydraulic fluid products to the correct MIL, NATO, or OEM specifications. It does not indicate whether hydraulic fluids can be mixed or are compatible with each other.
The chart can help identify equivalent specifications, but selecting an alternative product should always be verified with OEM manuals, technical approvals, and compatibility testing. Hydraulic fluid substitution requires careful consideration of system requirements.
It helps ensure the correct product is used for a given application and supports compliance with military, OEM, and regulatory requirements. Using the wrong hydraulic fluid can lead to system failures, safety hazards, and equipment damage.
Different specifications define requirements for properties such as viscosity, fire resistance, seal compatibility, and operating temperature range. Military and aerospace specifications are particularly stringent to ensure reliability in critical applications.
