View Historical Standards for B439:

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Document Designation and Title Year Select Item(s) B439 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated) 08 B439 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil Impregnated) 07 B439 Standard Specification for Iron-Base Powder Metallurgy (PM) Bearings (Oil Impregnated) 06 B439 Standard Specification for Iron-Base Sintered Bearings (Oil-Impregnated) 00e1 B439 Standard Specification for Iron-Base Sintered Bearings (Oil-Impregnated) 00