3120-00-740-6473, BEARING,WASHER,THRUST

National Stock Number:
3120-00-740-6473

Federal Supply Class:
3120

National Item Identification Number:
007406473

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:

114R2178-1	77272	THE BOEING COMPANY
114R2178-1	81205	THE BOEING COMPANY
1560HC1-022	81996	U S ARMY AVIATION AND MISSILE COMMAND
114R2178-1	A0126	LEONARDO SPA HELICOPTERS DIVISION -PRODUCTION SITE

Techincal Specification:

CENTER HOLE KEYWAY RADIUS	0.2300 INCHES MINIMUM AND 0.2700 INCHES MAXIMUM
CENTER HOLE KEYWAY QUANTITY	8
CENTER HOLE SHAPE STYLE	ROUND W/ROUND KEYWAYS
CORNER SHAPE	SQUARE FIRST INSIDE CORNER
CORNER SHAPE	SQUARE FIRST OUTSIDE CORNER
CORNER SHAPE	SQUARE FOURTH INSIDE CORNER
CORNER SHAPE	ROUND SECOND INSIDE CORNER
CORNER SHAPE	SQUARE SECOND OUTSIDE CORNER
CORNER SHAPE	SQUARE THIRD INSIDE CORNER
COUNTERBORE DEPTH	0.0550 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM
COUNTERBORE DIAMETER	4.3900 INCHES MINIMUM AND 4.4100 INCHES MAXIMUM
CROSS-SECTIONAL SHAPE STYLE	COUNTERBORED
LUBRICATION FEATURE	PERFORATION EXTERNAL SURFACE MEMBER
MAJOR DIAMETER	4.3900 INCHES MINIMUM AND 4.4100 INCHES MAXIMUM
OUTSIDE DIAMETER	4.7600 INCHES MINIMUM AND 4.7800 INCHES MAXIMUM
OVERALL THICKNESS	0.1770 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-P-330 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	COPPER ALLOY OVERALL
MINOR DIAMETER	4.0070 INCHES MINIMUM AND 4.0090 INCHES MAXIMUM
SPECIAL FEATURES	IDENTICAL COUNTER BORE ON OPPOSITE BEARING SURFACE
STYLE DESIGNATOR	ROUND
SURFACE FINISH	63.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY
SURFACE FINISH	125.0 MICROINCHES COUNTERBORE DIAMETER
SURFACE FINISH	125.0 MICROINCHES LARGEST OUTSIDE DIAMETER
SURFACE FINISH	125.0 MICROINCHES LEFT SIDE
SURFACE FINISH	125.0 MICROINCHES RIGHT SIDE

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