ASTM B438/B438M-05

    Specification for Bronze Powder Metallurgy (P/M) Bearing (Oil-Impregnated)

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    1. Scope

    1.1 This specification covers sintered bronze, oil-impregnated bearings made primarily from elemental copper, tin, lead, and graphite powders. The manufacturer may, at his discretion, use prealloyed bronze powder in the mixed powder.

    1.2 This specification covers the following variables:

    1.2.1 GradesAvailable in three bronze base compositions identifiable by different graphite contents and one leaded bronze grade.

    1.2.2 TypeGrades 1 and 2 are available in four types described by specific density ranges. Grade 3 is available in two types and Grade 4 is available in one type.

    1.3 Bearings ordered to this specification will normally be sized after sintering and will be impregnated with a lubricating oil unless otherwise specified by the print.

    1.4 The values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.

    1.5 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

    B328 Test Method for Density, Oil Content, and Interconnected Porosity of Sintered Metal Structural Parts and Oil-Impregnated Bearings

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

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

    Government Standards

    FED-STD-151 Metals Test Method

    MPIF Standard

    MPIFStandard35 Materials Standards for P/M Self-Lubricating Bearings


    ICS Code

    ICS Number Code 21.100.01 (Bearings in general)

    UNSPSC Code

    UNSPSC Code 31171500(Bearings)


    DOI: 10.1520/B0438_B0438M-05

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