ASTM B438 PDF

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ASTM B Standard Specification for Bronze-Base Powder Metallurgy (PM) Bearings (Oil-Impregnated). ASTM – B, Grade 1, Type II; MPIF – CTK26; Military – MIL-BD, Type I, Grade I (this spec only applies to Bushings & Washers. It must be requested. ASTM – B, Grade 1, Type II. Military – MIL-BD, Type I, Comp. A. MPIF – CTK Heavy industry uses Sintered Bronze as machinery components.

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This standard does not purport to address all of the safety concerns, if any, associated with its use. The testing procedure and material strength requirements of the? The manufacturer may, at his discretion, use prealloyed bronze powder in the blend. Lubricant content may be veri? These bearings have slightly higher strength constants and slightly lower oil content.

Bearing shall conform to this speci? Historical Version s – view previous versions of standard.

Oil Impregnated Sintered Bronze – plate, cored bar, solid bar & bushings

Therefore, only minimum recommended clearances are listed in Table X1. Thanks for contacting us. Quality Bronze Products for over years. This acceptance procedure can be very useful when evaluating multiple or repeat shipments of the same bearing.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of b4338 of such rights, are v438 their own responsibility. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

Grade 3 is available in two types and Grade 4 is available in one type. The dash numbers remain unchanged from the MS Waivers for minor defects may be addressed to the contracting officer. Any defect or failure shall be cause for rejection of the lot. Flanges A comparatively small flange, step, or overhang can often be produced by machining a shelf or step in the die. The following questions are most important for the material and process selection: If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

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ASTM B / BM – 00 Standard Specification for Sintered Bronze Bearings (Oil-Impregnated)

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

After sizing and inspection, they are impregnated with a lubricating oil unless otherwise speci? Within the text, the SI units are shown in brackets. Second, whole spherical bearings from the same lot are crushed, keeping their axes horizontal, to determine the breaking load of the whole bearing. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Lack of appreciable sweating of the lubricant on the bearing surface will be cause for rejection. Avoid designing long, thin walls; they require tooling that is fragile and the parts themselves have a tendency toward density variation.

This standard has been approved for use by agencies of the Department of Defense. Lubricant content may be veri? Special Tolerancein. Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci? If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

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The manufacturer may, at his discretion, use prealloyed bronze powder in the mixed powder.

These supplementary requirements shall appear separately. As a general rule, walls should not be thinner than 0. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Link to Active This link will always route to the current Active version of the standard.

Must the part be protected from corrosion—how severe?

B48 dimensions are referenced throughout the tolerance tables. Bearings are a natural product for PM because of its controlled porosity and the resulting self-contained lubrication.

The test procedure sstm breaking load requirements for the? The shaping of a sintered bearing is essentially defined by the tool design and its manufacture. Compression ratio—the ratio of the height of the loose powder filling the die to that of the compacted part—also tends to limit vertical part lengths. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Oil Impregnated Sintered Bronze / SAE Products

Those additional government requirements that only apply to military bearings are listed in the Supplementary Requirements section of this specification.

Workmanship, Finish, and Appearance Use the minimum radial crushing strength value speci? Contractor shall furnish a percent composition analysis on an oil-free basis for each lot showing the percentage for each element as speci? B Outside diameter tolerances are the same as for? Is surface finish an important design feature, where, how to measure?