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|  MIL-B-13501D (MI)
3.2.1 Chemical analysis. Chemical analysis as specified in the contract or order shall
be furnished showing the percentage of the elements designated in table I (see 4.6.1). If
during the course of routine analysis, the presence of other named elements is suspected or
indicated, further analysis shall be made to determine that the elements are not in excess of
the limits specified. Other elements in excess of the limits specified in table I shall be cause
for rejection.
3.3 Dimensions and tolerances. Dimensions and tolerances for bearings and bushings
shall be as specified on the applicable drawings (see 6.2) unless otherwise specified (see
3.3.1).
3.3.1 Finishing after assembly. When specified, bearings and bushings shall be
furnished with sufficient stock on the bearing surfaces for finish boring and reaming after
assembly.
3.4 Oil grooves. Oil grooves of bearings and bushings shall be as specified on
applicable drawings or as specified in the contract or order (see 6.2).
3.5 Hardness. The hardness of the bearings shall be specified on the applicable
drawings (see 4.6.2).
3.6 Graphited bearings and bushings. When specified, bearings and bushings shall be
furnished with graphite filled indentations or grooves on the bearing surface. The graphite
shall be firmly adherent to the surface. The size, shape, and location of indentations or
grooves shall be specified in the contract or on the applicable drawings.
3.7 Cylindrical bushings. Unless otherwise specified, full cylindrical bushings shall
be formed from tubing or from flat strip with a butt joint parallel to the longitudinal axis of the
bushing.
3.8 Workmanship. Bearings and bushings shall be of uniform quality and structure
and shall be free from defects such as dirt, dross, oxides, porous or spongy spots, shrinkage
cavities, cracks, cold-shuts, blow-holes, hard spots, blisters, or other injurious defects.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the contract or
purchase order, the contractor is responsible for the performance of all inspection
requirements (examinations and tests) as specified herein. Except as otherwise specified in
the contract or purchase order, the contractor may use his own or any other facilities suitable
for the performance of the inspection requirements specified herein, unless disapproved by the
Government. The Government reserves the right to perform any of the inspections set forth in
this specification where such inspections are deemed necessary to ensure supplies and
services conform to prescribed requirements.
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