5305-01-491-4259, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-491-4259

Federal Supply Class:
5305

National Item Identification Number:
014914259

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:

03A519-4-13C	1W025	NORTHROP GRUMMAN SYSTEMS CORP
CB9350-4-13C	66530	CLICK BOND INC

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	1.222 INCHES MINIMUM AND 1.252 INCHES MAXIMUM
GRIP LENGTH	0.562 INCHES NOMINAL
GRIP DIAMETER	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
HEAD DIAMETER	0.449 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	TORX
MATERIAL DOCUMENT AND CLASSIFICATION	09A196-2,CAGE1W025 MFR REF SINGLE MATERIAL RESPONSE TOP OF HEAD
MATERIAL DOCUMENT AND CLASSIFICATION	AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS4967 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
MATERIAL	PLASTIC TOP OF HEAD
MATERIAL	TITANIUM ALLOY UNS R56400 FASTENER
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SPECIAL FEATURES	PLASTIC CAP PERMENENTLY AFFIXED TO HEAD
SPLINE MAJOR DIAMETER	0.173 INCHES MINIMUM AND 0.183 INCHES MAXIMUM
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.425 INCHES NOMINAL
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	28

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