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National Stock Number:
5305-01-521-5771
Federal Supply Class:
5305
National Item Identification Number:
015215771
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:
| 11923-3D4 | 59563 | REID PRODUCTS INC. | | HT4027-3D4 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4027-3D4 | 56878 | SPS TECHNOLOGIES, LLC | | ST3M557-3D4 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.381 INCHES MINIMUM AND | | 0.431 INCHES MAXIMUM | | FASTENER LENGTH | 0.671 INCHES NOMINAL | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | HEAD STYLE | FILLISTER COUNTERSUNK | | HEAD DIAMETER | 0.297 INCHES MINIMUM AND | | 0.302 INCHES MAXIMUM | | HEAD HEIGHT | 0.013 INCHES NOMINAL | | COUNTERSINK ANGLE | 99.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 0.240 INCHES MINIMUM AND | | 0.250 INCHES MAXIMUM | | GRIP DIAMETER | 0.189 INCHES MINIMUM AND | | 0.190 INCHES MAXIMUM | | SPECIAL FEATURES | ITEM HAS DRILLED THREADS | | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
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