5305-01-227-4605, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-227-4605

Federal Supply Class:
5305

National Item Identification Number:
012274605

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:

NAS4503U20

80205

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

Techincal Specification:

GRIP LENGTH	1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM
FASTENER LENGTH	1.558 INCHES MINIMUM AND 1.588 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
THREAD LENGTH	1.491 INCHES MINIMUM AND 1.655 INCHES MAXIMUM
INTERNAL DRIVE STYLE	TRI-WING RECESS
THREAD QUANTITY PER INCH	32
THREAD CLASS	3A
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS4003 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SPECIFICATION/STANDARD DATA	80205-NAS4503 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
THREAD DIRECTION	RIGHT-HAND
MATERIAL	IRON ALLOY 660 OVERALL
SINGLE SHEAR STRENGTH	95000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.190 INCHES
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD SERIES DESIGNATOR	UNJF
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
GRIP DIAMETER	0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM
HEAD DIAMETER	0.338 INCHES MINIMUM AND 0.381 INCHES MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM

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