5305-00-766-5306, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-00-766-5306

Federal Supply Class:
5305

National Item Identification Number:
007665306

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:

51B581-4-11H	06725	SPS TECHNOLOGIES, LLC
51B581-4-11H	06950	HOWMET GLOBAL FASTENING SYSTEMS INC
51B581-4-11H	08254	ERWOOD INC
51B581-4-11H	0JRC1	NORTHROP GRUMMAN TECHNICAL SERVICES, INC.
51B581-4-11H	27624	SPS TECHNOLOGIES LLC
51B581-4-11H	73197	HI-SHEAR CORPORATION
51B581-4-11H	76823	NORTHROP GRUMMAN SYSTEMS CORPORATION
51B581-4-11H	79U29	NORTHROP GRUMMAN SYSTEMS CORPORATION
51B581-4-11H	80539	SPS TECHNOLOGIES, LLC
51B581-4-11H	92215	HOWMET GLOBAL FASTENING SYSTEMS INC
51B581-4-11H	L4528	LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC

Techincal Specification:

COUNTERSINK ANGLE	99.5 DEGREES MINIMUM AND 100.5 DEGREES MAXIMUM
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.862 INCHES MINIMUM AND 0.867 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	0.978 INCHES MINIMUM AND 0.983 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND 40.0 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 DOCUMENT AND CLASSIFICATION	MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 4140 OR STEEL COMP 4340 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
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 OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.316 INCHES MINIMUM
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28

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