5305-01-048-1144, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-048-1144

Federal Supply Class:
5305

National Item Identification Number:
010481144

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:

51B223-13H	0JRC1	NORTHROP GRUMMAN TECHNICAL SERVICES, INC.
51B223-13H	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.312 INCHES
THREAD QUANTITY PER INCH	24
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.345 INCHES MINIMUM AND
	0.422 INCHES MAXIMUM
FASTENER LENGTH	1.172 INCHES MINIMUM AND
	1.219 INCHES MAXIMUM
MATERIAL	STEEL COMP E4340 OR
	STEEL COMP 4140 OR
	STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR
	MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OR
	MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND
	CHROMATE OR
	CADMIUM OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	Q-P-416 TY2 CL2 FED SPEC 13TH TREATMENT RESPONSE OR
	NAS 672 ASSN STD 2ND TREATMENT RESPONSE OVERALL
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND
	43.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	180000 POUNDS PER SQUARE INCH
HEAD STYLE	PAN
HEAD DIAMETER	0.568 INCHES MINIMUM AND
	0.593 INCHES MAXIMUM
HEAD HEIGHT	0.162 INCHES MINIMUM AND
	0.183 INCHES MAXIMUM
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
GRIP LENGTH	0.797 INCHES MINIMUM AND
	0.827 INCHES MAXIMUM
GRIP DIAMETER	0.3110 INCHES MINIMUM AND
	0.3120 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES GRIP
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.068 INCHES NOMINAL FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.066 INCHES MINIMUM AND
	0.086 INCHES MAXIMUM FIRST HOLE

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