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National Stock Number:
5305-01-571-8597
Federal Supply Class:
5305
National Item Identification Number:
015718597
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.
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Manufacturer Information:
| 03A519-4-8C | 1W025 | NORTHROP GRUMMAN SYSTEMS CORP | | CB9350-4-8C | 66530 | CLICK BOND INC |
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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 | 0.425 INCHES NOMINAL | | FASTENER LENGTH | 0.925 INCHES NOMINAL | | MATERIAL | TITANIUM ALLOY UNS R56400 OVERALL | | PLASTIC TOP OF HEAD | | TITANIUM ALLOY UNS R56400 FASTENER | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | AMS4928 ASSN STD SINGLE MATERIAL RESPONSE FASTENER | | COLOR | GRAY/GREY TOP OF HEAD | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.449 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | TORX | | SPLINE MAJOR DIAMETER | 0.173 INCHES MINIMUM AND | | 0.183 INCHES MAXIMUM | | GRIP LENGTH | 0.500 INCHES NOMINAL | | GRIP DIAMETER | 0.249 INCHES NOMINAL | | SPECIAL FEATURES | SMOOTHNESS CRITICAL ITEM WHEN INSTALLED | | CRITICALITY CODE JUSTIFICATION | FEAT | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 1W025 | | MFR SOURCE CONTROLLING REFERENCE | 03A519-4-8C |
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