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National Stock Number:
5305-01-494-8094
Federal Supply Class:
5305
National Item Identification Number:
014948094
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:
| HT4020-4-14 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-14 | 17446 | HUCK INTERNATIONAL, INC | | HT4020-4-14 | 73197 | HI-SHEAR CORPORATION | | HT4020-4-14 | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-4-14 | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4020-4-14 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M652C4-14D | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | WC4020-4-14 | 60516 | WEST COAST AEROSPACE, INC. | | ST3M652C4-14D | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 1.328 INCHES MINIMUM AND 1.375 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM | | HEAD HEIGHT | 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM | | HEAD DIAMETER | 0.5018 INCHES MINIMUM AND 0.5066 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | NOMINAL THREAD DIAMETER | 0.2500 INCHES | | SPECIAL FEATURES | ITEM INTENDED FOR USE IN FUEL SEALING APPLICATIONS | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.469 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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