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National Stock Number:
3120-01-317-5247
Federal Supply Class:
3120
National Item Identification Number:
013175247
Description:
BEARING,WASHER,THRUST
Detail:
An item of any peripheral shape usually having one flat or spherical surface and a centrally located hole. It is designed for applications involving moving (kinetic) loads. Except for items fabricated from bearing quality synthetic (plastic) or composed of multilayer material, one bearing surface must either have a specific surface finish designation of 32 microinch (0.8 micrometre) or less, arithmetical average (aa) (arithmetic mean deviation) or one of the following conditions: be lapped or ground; have visible or detectable means of lubrication; grooves, indentations; or self-lubrication. The thickness must not exceed 25 percent of the outside diameter of the shortest distance between peripheral flats (when thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance). Excludes straight, tubular (without flange) items having a bearing surface(s) parallel to the axis of the bore only. See also WASHER, FLAT and SPACER, SLEEVE.
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Manufacturer Information:
| MS21783-12222 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND | | CORNER SHAPE | SQUARE ALL CORNERS | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | DIAMETER | 0.7480 INCHES MINIMUM AND 0.7580 INCHES MAXIMUM | | HARDNESS RATING | 30.0 ROCKWELL H MINIMUM AND 70.0 ROCKWELL H MAXIMUM OVERALL | | OVERALL THICKNESS | 0.0570 INCHES MINIMUM AND 0.0670 INCHES MAXIMUM | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-5687,TYPE 1,GRADE 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | COPPER ALLOY 841 OVERALL | | MATERIAL | OIL LUBRICATING LUBRICATION | | OUTSIDE DIAMETER | 1.3700 INCHES MINIMUM AND 1.3800 INCHES MAXIMUM | | STYLE DESIGNATOR | ROUND | | SURFACE FINISH | 32.0 MICROINCHES LEFT END SURFACE OF BODY | | SURFACE FINISH | 32.0 MICROINCHES LEFT SIDE |
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