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National Stock Number:
5310-01-143-1770
Federal Supply Class:
5310
National Item Identification Number:
011431770
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:
| 65103-11039-102 | 54878 | ROTAIR AEROSPACE CORP | | 65103-11039-102 | 65780 | TEK PRECISION CO LIMITED | | 65103-11039-102 | 78286 | SIKORSKY AIRCRAFT CORPORATION |
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Techincal Specification:
| CENTER HOLE SHAPE STYLE | ROUND W/FLATS | | CROSS-SECTIONAL SHAPE STYLE | RECTANGULAR | | HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM | | HOLE DIAMETER | 2.842 INCHES MINIMUM AND 2.852 INCHES MAXIMUM | | HOLE WIDTH ACROSS FLATS | 2.628 INCHES MINIMUM AND 2.630 INCHES MAXIMUM | | OVERALL DIAMETER | 3.250 INCHES NOMINAL | | PERIPHERAL SHAPE STYLE | ROUND | | SURFACE FINISH | 90.0 MICROINCHES ALL SURFACES | | SURFACE TREATMENT | OXIDE OVERALL | | THICKNESS | 0.115 INCHES MINIMUM AND 0.120 INCHES MAXIMUM |
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