5305-00-883-6492, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-00-883-6492

Federal Supply Class:
5305

National Item Identification Number:
008836492

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:

NAS1204-28	04348	LAWRENCE ENGINEERING AND SUPPLY INC
NAS1204-28	07851	NOR-CAL SUPPLY CO
NAS1204-28	08938	AIR INDUSTRIES CO INC
NAS1204-28	30889	ERIKS SOUTHWEST INC DBA MONTCLAIR ENTERPRISES
NAS1204-28	30902	F AND C SALES INC
NAS1204-28	50568	APCOM INC
NAS1204-28	56878	SPS TECHNOLOGIES, LLC
NAS1204-28	71563	COLLINS ENGINEERING CORP
NAS1204-28	73197	HI-SHEAR CORPORATION
NAS1204-28	80205	NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE
NAS1204-28	80539	SPS TECHNOLOGIES, LLC
NAS1204-28	82172	DURHAM AIRCRAFT SERVICE INC
NAS1204-28	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
DEPARTURE FROM CITED DESIGNATOR	AS MOD BY SPECIAL FEATURES
FASTENER LENGTH	2.057 INCHES MINIMUM AND 2.081 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	1.740 INCHES MINIMUM AND 1.760 INCHES MAXIMUM
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.449 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	CROSS RECESS TYPE 1
MATERIAL	STEEL OVERALL
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SPECIAL FEATURES	FLEET BALLISTIC MISSILE QUALITY AS IDENTIFIED BY QUALITY CONRTOL NO. POSO 910917
SPECIFICATION/STANDARD DATA	80205-NAS1204 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.291 INCHES MINIMUM AND 0.341 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28

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