5305-01-455-1406, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-455-1406

Federal Supply Class:
5305

National Item Identification Number:
014551406

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:

NAS1580A8T32

80205

NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	2.753 INCHES MINIMUM AND 2.783 INCHES MAXIMUM
GRIP DIAMETER	0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM
GRIP LENGTH	1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM
HEAD DIAMETER	0.951 INCHES MINIMUM AND 1.014 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	160000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.500 INCHES
PART NAME ASSIGNED BY CONTROLLING AGENCY	NAVY SPECIAL PROJECT
SPECIFICATION/STANDARD DATA	80205-NAS1580 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
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	0.768 INCHES NOMINAL
THREAD QUANTITY PER INCH	20
THREAD SERIES DESIGNATOR	UNF

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