5305-00-471-6645 SCREW,CLOSE TOLERANCE Index 5306-00-471-6647 BOLT

National Stock Number:
5305-00-471-6646

Federal Supply Class:
5305

National Item Identification Number:
004716646

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:
99-603882599995NATO STOCK NUMBER ASSIGNED BY ANOTHER NATION
STD2180E40K0289BRITISH AEROSPACE MILITARY AIRCRAFT & AEROSTRUCTURES
STD2180E40U9143BAE SYSTEMS (OPERATIONS) LIMITED


Techincal Specification:
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH0.640 INCHES NOMINAL
GRIP LENGTH0.400 INCHES NOMINAL
GRIP DIAMETER0.2495 INCHES MINIMUM AND 0.2504 INCHES MAXIMUM
HEAD DIAMETER0.452 INCHES MINIMUM AND 0.510 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
INTERNAL DRIVE STYLEHIGH-TORQUE
MATERIALTITANIUM ALLOY OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONSTD.2167 CAGEC K0289 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS3A
THREAD LENGTH0.240 INCHES NOMINAL
THREAD DIRECTIONRIGHT-HAND
THREAD SERIES DESIGNATORUNF
THREAD QUANTITY PER INCH28


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