5305-01-457-8291, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-457-8291

Federal Supply Class:
5305

National Item Identification Number:
014578291

Description:
SCREW,CLOSE TOLERANCE

Detail:
A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 IN.) (0.025 mm) or less of a specific diameter for items (1.000 IN.) (25 mm) or less in diameter. Items over (1.000 IN.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 IN.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 IN.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the Screw Thread Standards, FED STD H28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Manufacturer Information:

NAS6803DU18

80205

NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.988 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST HOLE
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.988 INCHES MINIMUM AND 0.998 INCHES MAXIMUM GRIP
FASTENER LENGTH	1.455 INCHES MINIMUM AND 1.485 INCHES MAXIMUM
GRIP DIAMETER	0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM
GRIP LENGTH	1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM
HEAD HEIGHT	0.110 INCHES MINIMUM AND 0.125 INCHES MAXIMUM
HEAD STYLE	HEXAGON
INTERNAL DRIVE STYLE	W/O INTERNAL DRIVE
MATERIAL	TITANIUM ALLOY UNS R56400 OVERALL
NOMINAL THREAD DIAMETER	0.190 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM GRIP
SPECIFICATION/STANDARD DATA	80205-NAS6803 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.345 INCHES NOMINAL
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	32
WIDTH BETWEEN FLATS	0.357 INCHES MINIMUM AND 0.376 INCHES MAXIMUM

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