3120-00-776-7490, BEARING,WASHER,THRUST

National Stock Number:
3120-00-776-7490

Federal Supply Class:
3120

National Item Identification Number:
007767490

Description:
BEARING,WASHER,THRUST

Detail:
An item of any peripheral shape usually having one flat or spherical surface and a centrally located hole. It is designed for applications involving moving (kinetic) loads. Except for items fabricated from bearing quality synthetic (plastic) or composed of multilayer material, one bearing surface must either have a specific surface finish designation of 32 microinch (0.8 micrometre) or less, arithmetical average (aa) (arithmetic mean deviation) or one of the following conditions: be lapped or ground; have visible or detectable means of lubrication; grooves, indentations; or self-lubrication. The thickness must not exceed 25 percent of the outside diameter of the shortest distance between peripheral flats (when thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance). Excludes straight, tubular (without flange) items having a bearing surface(s) parallel to the axis of the bore only. See also WASHER, FLAT and SPACER, SLEEVE.

Manufacturer Information:

7767490	19207	U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM
835865	99551	GOODRICH CORPORATION

Techincal Specification:

MATERIAL	COPPER ALLOY OVERALL
STYLE DESIGNATOR	ROUND
OUTSIDE DIAMETER	3.2310 INCHES MINIMUM AND
	3.2330 INCHES MAXIMUM
CORNER SHAPE	SQUARE FIRST OUTSIDE CORNER
	SQUARE SECOND OUTSIDE CORNER
	SQUARE FIRST INSIDE CORNER
	SQUARE SECOND INSIDE CORNER
	SQUARE THIRD INSIDE CORNER
	SQUARE FOURTH INSIDE CORNER
CROSS-SECTIONAL SHAPE STYLE	COUNTERBORED
COUNTERBORE DIAMETER	3.0930 INCHES MINIMUM AND
	3.0950 INCHES MAXIMUM
COUNTERBORE DEPTH	0.0940 INCHES MINIMUM AND
	0.0990 INCHES MAXIMUM
OVERALL THICKNESS	0.1710 INCHES MINIMUM AND
	0.1760 INCHES MAXIMUM
CENTER HOLE SHAPE STYLE	ROUND
DIAMETER	3.0625 INCHES MINIMUM AND
	3.0781 INCHES MAXIMUM
SURFACE CONDITION	GROUND
BEARING SURFACE HOLE QUANTITY	6 FIRST
BEARING SURFACE HOLE DIAMETER	0.1250 INCHES NOMINAL FIRST

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