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National Stock Number:
5305-01-519-1476
Federal Supply Class:
5305
National Item Identification Number:
015191476
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:
| 120-259V4A12 | 97499 | BELL TEXTRON INC | | 5314V4A12 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | NAS53124V4A12 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE |
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Techincal Specification:
| FASTENER LENGTH | 1.234 INCHES NOMINAL | | GRIP LENGTH | 0.750 INCHES NOMINAL | | GRIP DIAMETER | 0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM | | HEAD DIAMETER | 0.482 INCHES NOMINAL | | HEAD HEIGHT | 0.168 INCHES NOMINAL | | HEAD STYLE | UNDERCUT PAN NO. 2 | | INTERNAL DRIVE STYLE | TORX | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 4928 FED SPEC 1ST MATERIAL RESPONSE OR AMS 4967 FED SPEC 2ND MATERIAL RESPONSE OVERALL | | MATERIAL | TITANIUM ALLOY UNS R54520 OVERALL | | MINIMUM TENSILE STRENGTH | 5820 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, SHEAR, PAN HEAD, CLOSE TOLERANCE, SHORT THREAD, SIX LOBE RECESS, 95 KSI FSU | | SPLINE MAJOR DIAMETER | 0.221 INCHES NOMINAL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS4006 ASSN STD 1ST TREATMENT RESPONSE AND CETYL ALCOHOL LUBRICANT PER MIL-L-87132, TYPE 3, GRADE B MIL SPEC 2ND TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | PAINT AND LUBRICANT OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.298 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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