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National Stock Number:
5305-01-128-5128
Federal Supply Class:
5305
National Item Identification Number:
011285128
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:
| HT4020-7-23A | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-7-23A | 0PTK6 | SPS TECHNOLOGIES INC | | HT4020-7-23A | 17446 | HUCK INTERNATIONAL, INC | | HT4020-7-23A | 56878 | SPS TECHNOLOGIES, LLC | | HT4020-7-23A | 73197 | HI-SHEAR CORPORATION | | HT4020-7-23A | 80539 | SPS TECHNOLOGIES, LLC | | ST3M652C7-23A | 17446 | HUCK INTERNATIONAL, INC | | ST3M652C7-23A | 76301 | THE BOEING COMPANY | | ST3M652C7-23A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-7-23A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-7-23A | 97928 | HUCK INTL INC | | ST3M652C7-23A | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4020-7-23A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.438 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.630 INCHES MINIMUM AND | | 0.697 INCHES MAXIMUM | | FASTENER LENGTH | 2.078 INCHES MINIMUM AND | | 2.125 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | HEAD DIAMETER | 0.881 INCHES MINIMUM AND | | 0.888 INCHES MAXIMUM | | HEAD HEIGHT | 0.130 INCHES MINIMUM AND | | 0.133 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 1.428 INCHES MINIMUM AND | | 1.448 INCHES MAXIMUM | | GRIP DIAMETER | 0.4365 INCHES MINIMUM AND | | 0.4370 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS | | SPECIAL FEATURES | FURNISHED WITH ONE ORING |
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