5310-00-230-0525, WASHER,FLAT

4820-00-230-0527 VALVE,LINEAR,DIRECTIONAL CONTROL

National Stock Number:
5310-00-230-0525

Federal Supply Class:
5310

National Item Identification Number:
002300525

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.

Manufacturer Information:

S1535-61262-8

78286

SIKORSKY AIRCRAFT CORPORATION

Techincal Specification:

CENTER HOLE SHAPE STYLE	ROUND
CROSS-SECTIONAL SHAPE STYLE	RECTANGULAR
HARDNESS RATING	34.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
HOLE DIAMETER	0.516 INCHES MINIMUM AND 0.532 INCHES MAXIMUM
OVERALL DIAMETER	1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 4130 OVERALL
MINIMUM TENSILE STRENGTH	150000 POUNDS PER SQUARE INCH
PERIPHERAL SHAPE STYLE	ROUND
SURFACE FINISH	100.0 MICROINCHES ALL SURFACES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-S-365,TYPE 1,GRADE A MIL SPEC SINGLE TREATMENT RESPONSE OR SS8488,FSCM 78286 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	SILVER OR NICKEL AND CADMIUM OVERALL
THICKNESS	0.080 INCHES MINIMUM AND 0.100 INCHES MAXIMUM

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