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National Stock Number:
5310-00-731-1798
Federal Supply Class:
5310
National Item Identification Number:
007311798
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:
| 7311798 | 19200 | US ARMY ARDEC RDECOM | | 7311798 | 19205 | SPRINGFIELD ARMORY |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | HARDNESS RATING | 84.0 ROCKWELL B MINIMUM AND 96.0 ROCKWELL B MAXIMUM | | HOLE DIAMETER | 0.140 INCHES MINIMUM AND 0.143 INCHES MAXIMUM | | OVERALL DIAMETER | 0.359 INCHES MINIMUM AND 0.391 INCHES MAXIMUM | | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A108 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP 1015 OR STEEL COMP 1022 OVERALL | | PERIPHERAL SHAPE STYLE | ROUND | | SURFACE TREATMENT | PHOSPHATE OVERALL | | THICKNESS | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM |
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