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National Stock Number:
5305-01-487-6877
Federal Supply Class:
5305
National Item Identification Number:
014876877
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:
| HT4024-3-7 | 80539 | SPS TECHNOLOGIES, LLC | | HT4027-3-7 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M557-3-7 | 007R1 | TWIST TITE MFG, INC | | ST3M557-3-7 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M557-3-7 | 22337 | BRIDGESTONE AMERICAS TIRE OPERATIONS, LLC | | ST3M557-3-7 | 56878 | SPS TECHNOLOGIES, LLC | | ST3M557-3-7 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M557-3-7 | 60516 | WEST COAST AEROSPACE, INC. | | ST3M557-3-7 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 0.765 INCHES MINIMUM AND 0.812 INCHES MAXIMUM | | HEAD DIAMETER | 0.2966 INCHES MINIMUM AND 0.3016 INCHES MAXIMUM | | HEAD STYLE | OVAL COUNTERSUNK | | MATERIAL DOCUMENT AND CLASSIFICATION | 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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