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National Stock Number:
5305-00-814-8736
Federal Supply Class:
5305
National Item Identification Number:
008148736
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:
| NAS1204-23 | 04348 | LAWRENCE ENGINEERING AND SUPPLY INC | | NAS1204-23 | 07851 | NOR-CAL SUPPLY CO | | NAS1204-23 | 08938 | AIR INDUSTRIES CO INC | | NAS1204-23 | 30889 | ERIKS SOUTHWEST INC DBA MONTCLAIR ENTERPRISES | | NAS1204-23 | 30902 | F AND C SALES INC | | NAS1204-23 | 50568 | APCOM INC | | NAS1204-23 | 56878 | SPS TECHNOLOGIES, LLC | | NAS1204-23 | 71563 | COLLINS ENGINEERING CORP | | NAS1204-23 | 73197 | HI-SHEAR CORPORATION | | NAS1204-23 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | NAS1204-23 | 80539 | SPS TECHNOLOGIES, LLC | | NAS1204-23 | 82172 | DURHAM AIRCRAFT SERVICE INC | | NAS1204-23 | A0170 | LEONARDO SPA AEROSTRUCTURE DIVISION | | NAS1204-23 | C4293 | ALCOA FASTENING SYSTEMS FAIRCHILDFASTENERS EUROPE - VSD GMBH | | NAS1204-23 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS 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 | 0.341 INCHES MINIMUM AND | | 0.391 INCHES MAXIMUM | | FASTENER LENGTH | 1.739 INCHES MINIMUM AND | | 1.769 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | SURFACE TREATMENT | CADMIUM OR | | CHROMIUM OVERALL | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND | | 40.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.449 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | | GRIP LENGTH | 1.428 INCHES MINIMUM AND | | 1.448 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM |
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