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National Stock Number:
5305-01-044-2244
Federal Supply Class:
5305
National Item Identification Number:
010442244
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:
| CHT4020 | 17419 | DEUTSCH CO THE | | CHT4020 | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-4-9 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-9 | 17446 | HUCK INTERNATIONAL, INC | | HT4020-4-9 | 56878 | SPS TECHNOLOGIES, LLC | | CHT4020 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M652C4-9D | 17446 | HUCK INTERNATIONAL, INC | | HT4020-4-9 | 73197 | HI-SHEAR CORPORATION | | ST3M652C4-9D | 76301 | THE BOEING COMPANY | | ST3M652C4-9D | 80539 | SPS TECHNOLOGIES, LLC | | ST3M652C4-9D | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-9 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-9 | 97928 | HUCK INTL INC | | HT4020-4-9 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M652C4-9D | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 1.015 INCHES MINIMUM AND 1.062 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM | | HEAD HEIGHT | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM | | HEAD DIAMETER | 0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | CETYL ALCOHOL LUBRICATION | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE TREATMENT | PASSIVATE OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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