5305-01-359-2298, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-359-2298

Federal Supply Class:
5305

National Item Identification Number:
013592298

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:

MIL-B-23964	81349	MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
MS3369A612	96906	MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.375 INCHES
THREAD QUANTITY PER INCH	24
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.367 INCHES MINIMUM AND
	0.388 INCHES MAXIMUM
FASTENER LENGTH	1.289 INCHES MINIMUM AND
	1.309 INCHES MAXIMUM
MATERIAL	NICKEL ALLOY 600 OR
	NICKEL ALLOY X-750 SPRING
	IRON ALLOY 660 FASTENER
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-W-390 FED SPEC 1ST MATERIAL RESPONSE OR
	AMS5699 ASSN STD 2ND MATERIAL RESPONSE SPRING
	AMS5737 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
SURFACE TREATMENT	PASSIVATE SPRING
	PASSIVATE FASTENER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SPRING
	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER
MINIMUM TENSILE STRENGTH	90000 POUNDS PER SQUARE INCH
HEAD STYLE	CROWNED HEXAGON
HEAD HEIGHT	0.126 INCHES MINIMUM AND
	0.146 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.553 INCHES MINIMUM AND
	0.564 INCHES MAXIMUM
INTERNAL DRIVE STYLE	SLOT
GRIP LENGTH	0.750 INCHES MINIMUM AND
	0.766 INCHES MAXIMUM
GRIP DIAMETER	0.3737 INCHES MINIMUM AND
	0.3742 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.181 INCHES MINIMUM AND
	1.161 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.106 INCHES MINIMUM AND
	0.116 INCHES MAXIMUM FIRST HOLE
SPECIAL FEATURES	TWO LOCKING BALLS OR ELEMENTS ON GRIP
SPEC/STD CONTROLLING DATA
MANUFACTURERS CODE	81349
NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	MIL-B-23964
MANUFACTURERS CODE	96906
DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	MS3369A612

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