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National Stock Number:
5305-01-626-0694
Federal Supply Class:
5305
National Item Identification Number:
016260694
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:
| 11923-7-27 | 59563 | REID PRODUCTS INC. | | HT4027-7-27 | 06725 | SPS TECHNOLOGIES, LLC | | ST3M557-7-27 | 06710 | VALLEY-TODECO, INC. | | WC4027-7-27 | 60516 | WEST COAST AEROSPACE, INC. | | ST3M557-7-27 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.4375 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.656 INCHES NOMINAL | | FASTENER LENGTH | 2.3435 INCHES NOMINAL | | MATERIAL | NICKEL ALLOY 718 OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.612 INCHES MINIMUM AND | | 0.672 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 1.6875 INCHES NOMINAL | | GRIP DIAMETER | 0.4365 INCHES MINIMUM AND | | 0.4370 INCHES MAXIMUM |
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