ASTM D6158 - 14

    Standard Specification for Mineral Hydraulic Oils

    Active Standard ASTM D6158 | Developed by Subcommittee: D02.N0.10

    Book of Standards Volume: 05.03

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    This specification covers the standard for mineral oils used in hydraulic systems which require refined base oil (Class HH), refined mineral base oil with rust and oxidation inhibitors (Class HL) or refined mineral base oil with rust and oxidation inhibitors plus antiwear characteristics (Class HM). This specification only covers lubricating oils before they are installed in the hydraulic system and does not include all hydraulic oils. Requirements for the mineral oils shall include, but not limited to, viscosity, specific gravity, appearance, flash point, chemical acid number, corrosion, water separation, elastomer compatibility, air release, and thermal stability.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers mineral oils used in hydraulic systems, where the performance requirements demand fluids with one of the following characteristics:

    1.1.1 A refined base oil (Class HH),

    1.1.2 A refined mineral base oil with rust and oxidation inhibitors (Class HL), and

    1.1.3 A refined mineral base oil with rust and oxidation inhibitors plus antiwear characteristics (Class HM).

    1.2 This specification defines the requirements of mineral oil-based hydraulic fluids that are compatible with most existing machinery components when there is adequate maintenance.

    1.3 This specification defines only new lubricating oils before they are installed in the hydraulic system.

    1.4 This specification defines specific types of hydraulic oils. It does not include all hydraulic oils. Some oils that are not included may be satisfactory for certain hydraulic applications. Certain equipment or conditions of use may permit or require a wider or narrower range of characteristics than those described herein.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5.1 Exception—In X1.3.9 on Wear Protection, the values of pump pressure are in MPa, and the psi follows in brackets as a reference point immediately recognized by a large part of the industry.

    1.6 The following safety hazard caveat pertains to the test methods referenced in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitation prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester

    D97 Test Method for Pour Point of Petroleum Products

    D130 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test

    D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

    D471 Test Method for Rubber Property--Effect of Liquids

    D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    D665 Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water

    D892 Test Method for Foaming Characteristics of Lubricating Oils

    D943 Test Method for Oxidation Characteristics of Inhibited Mineral Oils

    D974 Test Method for Acid and Base Number by Color-Indicator Titration

    D1298 Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

    D1401 Test Method for Water Separability of Petroleum Oils and Synthetic Fluids

    D2070 Test Method for Thermal Stability of Hydraulic Oils

    D2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and 100C

    D2422 Classification of Industrial Fluid Lubricants by Viscosity System

    D2619 Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)

    D2983 Test Method for Low-Temperature Viscosity of Lubricants Measured by Brookfield Viscometer

    D3427 Test Method for Air Release Properties of Petroleum Oils

    D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter

    D4310 Test Method for Determination of Sludging and Corrosion Tendencies of Inhibited Mineral Oils

    D6080 Practice for Defining the Viscosity Characteristics of Hydraulic Fluids

    D7043 Test Method for Indicating Wear Characteristics of Non-Petroleum and Petroleum Hydraulic Fluids in a Constant Volume Vane Pump

    ICS Code

    ICS Number Code 75.120 (Hydraulic fluids)

    UNSPSC Code

    UNSPSC Code 15121504(Hydraulic oil)

    Referencing This Standard

    DOI: 10.1520/D6158-14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D6158-14, Standard Specification for Mineral Hydraulic Oils, ASTM International, West Conshohocken, PA, 2014,

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