5305-01-525-4939, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-525-4939

Federal Supply Class:
5305

National Item Identification Number:
015254939

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:

NAS2854T4PT

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	0.544 INCHES NOMINAL
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM
HEAD DIAMETER	0.3902 INCHES MINIMUM AND 0.3988 INCHES MAXIMUM
HEAD HEIGHT	0.076 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK UNDERCUT
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL DOCUMENT AND CLASSIFICATION	AMS4971 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	TITANIUM ALLOY OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SPECIFICATION/STANDARD DATA	80205-NAS2854 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	ALUMINUM OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.370 INCHES NOMINAL
THREAD SERIES DESIGNATOR	UNJF
THREAD QUANTITY PER INCH	32

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