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National Stock Number:
5310-99-310-0090
Federal Supply Class:
5310
National Item Identification Number:
993100090
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:
| BS3401 TABLE 3 | K7766 | BRITISH STANDARDS INSTITUTION | | BS3410 TABLE 3 | K7766 | BRITISH STANDARDS INSTITUTION | | G101/5575/ ITEM 8 | K7705 | KNDS DEFENCE UK LIMITED | | G101/5575/8 | K7705 | KNDS DEFENCE UK LIMITED | | W7031523 | K7705 | KNDS DEFENCE UK LIMITED |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | HOLE DIAMETER | 1.026 INCHES MINIMUM AND 1.031 INCHES MAXIMUM | | MATERIAL DOCUMENT AND CLASSIFICATION | BS 1449 EN2 (USE STG062) NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR BS1449 PART 1 CR4 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | STEEL | | PERIPHERAL SHAPE STYLE | ROUND | | OVERALL DIAMETER | 1.865 INCHES MINIMUM AND 1.875 INCHES MAXIMUM | | SPECIAL FEATURES | PASSIVATE DEF SPEC 130 | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | DEF STAN 03-20 MIL STD ALL TREATMENT RESPONSES | | SURFACE TREATMENT | ZINC AND CHROMATE | | THICKNESS | 0.072 INCHES NOMINAL |
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