ASTM B439-08

    Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)

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    1. Scope

    1.1 This specification covers porous metallic sleeve, flange, thrust, and spherical iron-base bearings that are produced from mixed metal powder utilizing powder metallurgy (PM) technology and then impregnated with oil to supply operating lubrication.

    1.2 Included are the specifications for the chemical, physical, and mechanical requirements of those ferrous PM materials that have been developed and standardized specifically for use in the manufacture of these self-lubricating bearings.

    1.3 This specification accompanies Specification B 438/B 438M that covers the requirements for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated).

    1.4 Typical applications for iron-base bearings are discussed in Appendix X1.

    1.5 Commercial bearing dimensional tolerance data are shown in Appendix X2, while engineering information regarding installation and operating parameters of PM bearings is included in Appendix X3. Additional useful information on self-lubricating bearings can be found in MPIF Standard 35 (Bearings) and the technical literature.

    1.6 With the exception of density values for which the g/cm3 unit is the industry standard, the values stated in inch-pound units are to be regarded as standard. The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

    1.7 The following safety hazards caveat pertains only to the test methods described 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 limitations 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

    B243 Terminology of Powder Metallurgy

    B438 Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)

    B939 Test Method for Radial Crushing Strength, K, of Powder Metallurgy (PM) Bearings and Structural Materials

    B962 Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes Principle

    B963 Test Methods for Oil Content, Oil-Impregnation Efficiency, and Interconnected Porosity of Sintered Powder Metallurgy (PM) Products Using Archimedes Principle

    B966 Test Method for Permeability of Powder Metallurgy (PM) Bearings Using Nitrogen Gas

    B970 Test Method for Cleanliness of Powder Metallurgy (PM) Bearings and Structural Parts

    E9 Test Methods of Compression Testing of Metallic Materials at Room Temperature

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques

    MPIF Standard

    MPIFStandard35 Materials Standards for PM Self-Lubricating Bearings


    ICS Code

    ICS Number Code 21.100.10 (Plain bearings)

    UNSPSC Code

    UNSPSC Code 23271805(Iron powder); 31171500(Bearings)


    DOI: 10.1520/B0439-08

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