5305-01-048-1143, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-048-1143

Federal Supply Class:
5305

National Item Identification Number:
010481143

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:

51B222-54H	06725	SPS TECHNOLOGIES, LLC
51B222-54H	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
51B222-54H	0JRC1	NORTHROP GRUMMAN TECHNICAL SERVICES, INC.
51B222-54H	27624	SPS TECHNOLOGIES LLC
51B222-54H	73197	HI-SHEAR CORPORATION
51B222-54H	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION
51B222-54H	80539	SPS TECHNOLOGIES, LLC
51B222-54H	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
51B222-54H	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

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	0.286 INCHES MINIMUM AND
	0.363 INCHES MAXIMUM
FASTENER LENGTH	3.676 INCHES MINIMUM AND
	3.723 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	QQ-P-416 TY2 CL2 FED SPEC 1ST 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	0.464 INCHES MINIMUM AND
	0.488 INCHES MAXIMUM
HEAD HEIGHT	0.133 INCHES MINIMUM AND
	0.150 INCHES MAXIMUM
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
GRIP LENGTH	3.360 INCHES MINIMUM AND
	3.390 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND
	0.2495 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES GRIP
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	3.575 INCHES NOMINAL FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.066 INCHES MINIMUM AND
	0.086 INCHES MAXIMUM FIRST HOLE

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