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.<\/p>\n
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.<\/p>\n
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.<\/p>\n
1.4 This specification acccompanies Specification B 439 that covers the requirements for Iron-Base Powder Metallurgy (PM) Bearings, (Oil-Impregnated).<\/p>\n
1.5 Typical applications for bronze-base bearings are listed in Appendix X1.<\/p>\n
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.<\/p>\n
1.7 With the exception of density values for which the g\/cm 3<\/sup> 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.<\/p>\n 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.<\/span><\/p>\n B438-08 Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated)<\/b><\/p>\nPDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 1<\/td>\n Scope
Referenced Documents <\/td>\n<\/tr>\n\n 2<\/td>\n Terminology
Classification
Ordering Information
Materials and Manufacture
Chemical Composition <\/td>\n<\/tr>\n\n 3<\/td>\n Physical Properties
Mechanical Properties
Dimensions, Mass, and Permissible Variations
TABLE 1
FIG. 1 <\/td>\n<\/tr>\n\n 4<\/td>\n Workmanship, Finish and Appearance
Sampling
Test Methods
FIG. 2
FIG. 3
FIG. 4 <\/td>\n<\/tr>\n\n 6<\/td>\n Inspection
Rejection and Rehearing
Certification and Test Report
Packaging
Keywords <\/td>\n<\/tr>\n\n 8<\/td>\n TABLE S3.1 <\/td>\n<\/tr>\n \n 11<\/td>\n TABLE S3.2 <\/td>\n<\/tr>\n \n 12<\/td>\n TABLE S3.3 <\/td>\n<\/tr>\n \n 13<\/td>\n TABLE S3.4
TABLE S3.5 <\/td>\n<\/tr>\n\n 14<\/td>\n 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 <\/td>\n<\/tr>\n\n 15<\/td>\n A2. CROSS INDEX OF BEARING MATERIALS
A2.1 Cross Reference
X1. BRONZE-BASE PM BEARINGS\u2014APPLICATIONS
X1.1 Introduction
TABLE A2.1 <\/td>\n<\/tr>\n\n 16<\/td>\n 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\u2014COMMERCIAL TOLERANCES
X2.1 Introduction
X2.2 Sleeve Bearings
X2.3 Flange Bearings <\/td>\n<\/tr>\n\n 17<\/td>\n X2.4 Thrust Washers
X2.5 Spherical Bearings
TABLE X2.1 <\/td>\n<\/tr>\n\n 18<\/td>\n TABLE X2.2
TABLE X2.3 <\/td>\n<\/tr>\n\n 19<\/td>\n X3. BRONZE-BASE PM BEARINGS\u2014ENGINEERING INFORMATION
X3.1 Introduction
X3.2 Bearing Loading and Speeds
TABLE X2.4
TABLE X2.5 <\/td>\n<\/tr>\n\n 20<\/td>\n X3.3 Pressure\/Velocity (PV) Factor
X3.4 Installation
X3.5 Running Clearance
X3.6 Bearing Life
TABLE X3.1 <\/td>\n<\/tr>\n\n 21<\/td>\n X4. PM BEARINGS\u2014ADDITIONAL INFORMATION
X4.1 MPIF Standard
X4.2 Metric Bearings
TABLE X3.2 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ASTM<\/b><\/a><\/td>\n 2008<\/td>\n 22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":117798,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[314,2637],"product_tag":[],"class_list":{"0":"post-117797","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-21-100-01","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/117797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/117798"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=117797"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=117797"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=117797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}