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National Stock Number:
5305-01-027-2006
Federal Supply Class:
5305
National Item Identification Number:
010272006
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:
| CHT4020-4-10A | 17419 | DEUTSCH CO THE | | CHT4020-4-10A | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-4-10A | 06725 | SPS TECHNOLOGIES, LLC | | HT4020-4-10A | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-10A | 17446 | HUCK INTERNATIONAL, INC | | CHT4020-4-10A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M652C4-10A | 17446 | HUCK INTERNATIONAL, INC | | HT4020-4-10A | 73197 | HI-SHEAR CORPORATION | | ST3M652C4-10A | 76301 | THE BOEING COMPANY | | HT4020-4-10A | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-4-10A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-4-10A | 97928 | HUCK INTL INC | | HT4020-4-10A | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4020-4-10A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M652C4-10A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M652C4-10A | 97928 | HUCK INTL 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 | 0.443 INCHES MINIMUM AND | | 0.510 INCHES MAXIMUM | | FASTENER LENGTH | 1.078 INCHES MINIMUM AND | | 1.125 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | HEAD DIAMETER | 0.502 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | HEAD HEIGHT | 0.071 INCHES MINIMUM AND | | 0.073 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 0.615 INCHES MINIMUM AND | | 0.635 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS | | SPECIAL FEATURES | FURNISHED WITH ONE O-RING |
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