5305-01-094-6060, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-094-6060

Federal Supply Class:
5305

National Item Identification Number:
010946060

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:

AS205-04-97	84256	AVIBANK MFG., INC.
CA2658-4-97	29372	HOWMET GLOBAL FASTENING SYSTEMS INC.
GB511DW4-97	26512	NORTHROP GRUMMAN SYSTEMS CORPORATION

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.287 INCHES MINIMUM AND
	0.318 INCHES MAXIMUM
FASTENER LENGTH	6.490 INCHES NOMINAL
MATERIAL DOCUMENT AND CLASSIFICATION	ASTM A580 COND. A ASSN STD SINGLE MATERIAL RESPONSE SPRING
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
HARDNESS RATING	38.0 ROCKWELL C MINIMUM AND
	45.0 ROCKWELL C MAXIMUM FASTENER
MINIMUM TENSILE STRENGTH	170000 POUNDS PER SQUARE INCH
HEAD STYLE	CROWNED HEXAGON
HEAD HEIGHT	0.126 INCHES MINIMUM AND
	0.141 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.430 INCHES MINIMUM AND
	0.439 INCHES MAXIMUM
INTERNAL DRIVE STYLE	SLOT
LOCKING FEATURE	DETENT BALL GRIP
GRIP LENGTH	6.062 INCHES MINIMUM AND
	6.078 INCHES MAXIMUM
GRIP DIAMETER	0.2487 INCHES MINIMUM AND
	0.2492 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	6.385 INCHES MINIMUM AND
	6.405 INCHES MAXIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND
	0.086 INCHES MAXIMUM FIRST HOLE
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT

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