5305-00-807-6688, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-00-807-6688

Federal Supply Class:
5305

National Item Identification Number:
008076688

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:

8859134	19203	PICATINNY ARSENAL
NAS2804-4	80205	NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE

Techincal Specification:

THREAD SERIES DESIGNATOR	UNF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.456 INCHES MINIMUM
FASTENER LENGTH	0.691 INCHES MINIMUM AND
	0.721 INCHES MAXIMUM
MATERIAL	STEEL COMP 4140 OR
	STEEL COMP E4340 OR
	STEEL COMP 6150 OR
	STEEL COMP 8735 OR
	STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR
	MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR
	MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OR
	MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR
	MIL-S-6049 MIL SPEC 5TH MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND
	40.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	180000 POUNDS PER SQUARE INCH
HEAD STYLE	FLAT COUNTERSUNK
HEAD DIAMETER	0.449 INCHES MINIMUM AND
	0.507 INCHES MAXIMUM
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND
	101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
GRIP LENGTH	0.250 INCHES NOMINAL
GRIP DIAMETER	0.2485 INCHES MINIMUM AND
	0.2495 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES GRIP
	32.0 MICROINCHES THREADS
SPECIFICATION/STANDARD DATA	80205-NAS2804 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD

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