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National Stock Number:
5305-01-536-0106
Federal Supply Class:
5305
National Item Identification Number:
015360106
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:
| 11923-4-6 | 59563 | REID PRODUCTS INC. | | ST3M557-4-6 | 007R1 | TWIST TITE MFG, INC | | ST3M557-4-6 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M557-4-6 | 56878 | SPS TECHNOLOGIES, LLC | | ST3M557-4-6 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M557-4-6 | 60516 | WEST COAST AEROSPACE, INC. | | ST3M557-4-6 | 73197 | HI-SHEAR CORPORATION | | ST3M557-4-6 | 76301 | THE BOEING COMPANY | | ST3M557-4-6 | 80539 | SPS TECHNOLOGIES, LLC | | ST3M557-4-6 | 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 | 0.406 INCHES NOMINAL | | FASTENER LENGTH | 0.829 INCHES MINIMUM AND | | 0.859 INCHES MAXIMUM | | MATERIAL | NICKEL ALLOY 718 OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | HEAD STYLE | OVAL COUNTERSUNK | | HEAD DIAMETER | 0.390 INCHES MINIMUM AND | | 0.395 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 0.365 INCHES MINIMUM AND | | 0.385 INCHES MAXIMUM | | GRIP DIAMETER | 0.249 INCHES NOMINAL |
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