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National Stock Number:
5310-01-031-8379
Federal Supply Class:
5310
National Item Identification Number:
010318379
Description:
WASHER,FLAT
Detail:
A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use SHIM. For items fabricated from ceramic or electrically rated materials by specification or industry standards use INSULATOR (1), WASHER. Excludes DISK, VALVE, graphite impregnated and lubricated items.
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Manufacturer Information:
| 2498489-4 | 10001 | NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER | | 2498489-4 | 53711 | NAVAL SEA SYSTEMS COMMAND |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND | | CRITICALITY CODE JUSTIFICATION | ZZZW | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | DEPARTURE FROM CITED DOCUMENT | AS DIFFERENTIATED BY SPECIAL QUALITY CONTROL TESTING FOR MK 48 TORPEDO | | HARDNESS RATING | 27.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM | | HOLE DIAMETER | 0.314 INCHES MINIMUM AND 0.322 INCHES MAXIMUM | | OVERALL DIAMETER | 0.489 INCHES MINIMUM AND 0.495 INCHES MAXIMUM | | MATERIAL | STEEL COMP 4140H OVERALL | | PERIPHERAL SHAPE STYLE | ROUND | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THICKNESS | 0.078 INCHES NOMINAL |
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