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National Stock Number:
5310-99-833-0726
Federal Supply Class:
5310
National Item Identification Number:
998330726
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:
| BS4320 | K7766 | BRITISH STANDARDS INSTITUTION | | W6032724 | K7705 | KNDS DEFENCE UK LIMITED |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND | | COLOR | YELLOW | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | HOLE DIAMETER | 31.00 MILLIMETERS MINIMUM AND 31.60 MILLIMETERS MAXIMUM AND 31.00 MILLIMETERS NOMINAL | | MATERIAL DOCUMENT AND CLASSIFICATION | BS 1449 PART 3B CS4 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | STEEL | | PERIPHERAL SHAPE STYLE | ROUND | | OVERALL DIAMETER | 55.00 MILLIMETERS MINIMUM AND 56.00 MILLIMETERS MAXIMUM | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | DEF SPEC 130 MIL STD 1ST TREATMENT RESPONSE | | SURFACE TREATMENT | PASSIVATE AND ZINC | | THICKNESS | 2.30 MILLIMETERS MINIMUM AND 2.70 MILLIMETERS MAXIMUM |
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