5305-01-445-6879, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-445-6879

Federal Supply Class:
5305

National Item Identification Number:
014456879

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.

Techincal Specification:

COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH	1.045 INCHES MINIMUM AND 1.075 INCHES MAXIMUM
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM
HEAD DIAMETER	0.447 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
HEAD STYLE	FLAT COUNTERSUNK
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5844 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	COBALT COMP MP-35-N OVERALL
MINIMUM TENSILE STRENGTH	240000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.250 INCHES
SINGLE SHEAR STRENGTH	132000 POUNDS PER SQUARE INCH
SPECIAL FEATURES	DRY FILM LUBRICANT THREADS ONLY
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	PASSIVATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.498 INCHES NOMINAL
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNJF

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