1.1 This specification covers porous metallic sleeve, flange, thrust and spherical bronze-base bearings that are produced from mixed metal powders 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 bronze-base PM materials that have been developed and standardized specifically for use in the manufacture of these self-lubricating bearings.

1.3 This specification is applicable to the purchase of bronze-base bearings (oil-impregnated) that were formerly covered by military specifications and are intended for government or military applications. Those additional government requirements that only apply to military bearings are listed in the Supplementary Requirements section of this specification.

1.4 This specification acccompanies Specification B 439 that covers the requirements for Iron-Base Powder Metallurgy (PM) Bearings, (Oil-Impregnated).

1.5 Typical applications for bronze-base bearings are listed in Appendix X1.

1.6 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 and the technical literature.

1.7 With the exception of density values for which the g/cm ³ unit is the industry standard, the values stated in inch-pound units are to be regarded as standard. The SI equivalents of inch-pound units, shown in parenthesis, have been converted in accordance with IEEE/ASTM SI 10, may be approximate and are only for information.

1.8 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.

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PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Classification Ordering Information Materials and Manufacture Chemical Composition
3	Physical Properties Mechanical Properties Dimensions, Mass, and Permissible Variations TABLE 1 FIG. 1
4	Workmanship, Finish and Appearance Sampling Test Methods FIG. 2 FIG. 3 FIG. 4
6	Inspection Rejection and Rehearing Certification and Test Report Packaging Keywords
8	TABLE S3.1
11	TABLE S3.2
12	TABLE S3.3
13	TABLE S3.4 TABLE S3.5
14	A1. PM MATERIAL DESIGNATION CODE A1.1 Introduction A1.2 Prefix Material Letter Code A1.3 Four-Digit Chemical Composition Code A1.4 Minimum Strength Suffix Code A1.5 Data Source TABLE A1.1 FIG. A1.1
15	A2. CROSS INDEX OF BEARING MATERIALS A2.1 Cross Reference X1. BRONZE-BASE PM BEARINGS—APPLICATIONS X1.1 Introduction TABLE A2.1
16	X1.2 Bronze Materials X1.3 Bronze-Graphite Materials X1.4 Bronze-High Graphite Materials X1.5 Bronze-Lead-Graphite Material (Military Grade) X1.6 Bronze-Iron-Graphite Materials X2. BRONZE-BASE PM BEARINGS—COMMERCIAL TOLERANCES X2.1 Introduction X2.2 Sleeve Bearings X2.3 Flange Bearings
17	X2.4 Thrust Washers X2.5 Spherical Bearings TABLE X2.1
18	TABLE X2.2 TABLE X2.3
19	X3. BRONZE-BASE PM BEARINGS—ENGINEERING INFORMATION X3.1 Introduction X3.2 Bearing Loading and Speeds TABLE X2.4 TABLE X2.5
20	X3.3 Pressure/Velocity (PV) Factor X3.4 Installation X3.5 Running Clearance X3.6 Bearing Life TABLE X3.1
21	X4. PM BEARINGS—ADDITIONAL INFORMATION X4.1 MPIF Standard X4.2 Metric Bearings TABLE X3.2

Published By	Publication Date	Number of Pages
ASTM	2008	22


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Standard Title	B438-08 Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)
Published Code	ASTM
Publication Date	2008
Pages Count	22
ICS Codes	21.100.01 - Bearings in general

ASTM-B438 2008

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ASTM-B438 2008(Redline)