5305-00-548-5077, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-00-548-5077

Federal Supply Class:
5305

National Item Identification Number:
005485077

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:

51B581-4-9	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION
51B581-4-9H	06725	SPS TECHNOLOGIES, LLC
51B581-4-9H	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
51B581-4-9H	0JRC1	NORTHROP GRUMMAN TECHNICAL SERVICES, INC.
51B581-4-9H	22915	NORTHROP GRUMMAN CORP ELECTRONIC SYSTEMS DEFENSIVE SYSTEM DIV
51B581-4-9H	27624	SPS TECHNOLOGIES LLC
51B581-4-9H	73197	HI-SHEAR CORPORATION
51B581-4-9H	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION
51B581-4-9H	80539	SPS TECHNOLOGIES, LLC
51B581-4-9H	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.736 INCHES MINIMUM AND 0.803 INCHES MAXIMUM FIRST HOLE
COUNTERSINK ANGLE	100.0 DEGREES NOMINAL
FASTENER LENGTH	0.862 INCHES MINIMUM AND 0.909 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL	STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OVERALL
MINIMUM TENSILE STRENGTH	180000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES NOMINAL FIRST HOLE
SPECIFICATION/STANDARD DATA	76823-51B581 MANUFACTURERS STANDARD
SURFACE FINISH	32.0 MICROINCHES GRIP
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNJF

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