5305-01-342-9434, SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-342-9434

Federal Supply Class:
5305

National Item Identification Number:
013429434

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:

5305PL0884225	9009H	INSPEKTORAT WSPARCIA SIL ZBROJNYCH
7002820-4	82577	RAYTHEON COMPANY

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.435 INCHES NOMINAL
FASTENER LENGTH	0.653 INCHES NOMINAL
MATERIAL	STEEL COMP 4140 OVERALL
SURFACE TREATMENT	CADMIUM OVERALL
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
HEAD STYLE	FLAT COUNTERSUNK
HEAD DIAMETER	0.390 INCHES MINIMUM AND
	0.410 INCHES MAXIMUM
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND
	101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE	OFFSET CRUCIFORM (TORQUE SET)
GRIP LENGTH	0.218 INCHES NOMINAL
GRIP DIAMETER	0.248 INCHES MINIMUM AND
	0.249 INCHES MAXIMUM
THE MANUFACTURERS DATA
MANUFACTURERS CODE	82577
DESIGN CONTROL REFERENCE	7002820-4

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