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National Stock Number:
5305-01-130-3273
Federal Supply Class:
5305
National Item Identification Number:
011303273
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:
| 10115240 | A486G | NIMIKKEISTOKESKUS NCB FINLAND | | HT4053-4-9 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4053-4-9 | 17446 | HUCK INTERNATIONAL, INC | | HT4053-4-9 | 56878 | SPS TECHNOLOGIES, LLC | | HT4053-4-9 | 73197 | HI-SHEAR CORPORATION | | HT4053-4-9 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4053-4-9A | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4053-4-9A | 0PTK6 | SPS TECHNOLOGIES INC | | HT4053-4-9A | 17446 | HUCK INTERNATIONAL, INC | | HT4053-4-9A | 1RC86 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4053-4-9A | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | HT4053-4-9A | 60516 | WEST COAST AEROSPACE, INC. | | HT4053-4-9A | 73197 | HI-SHEAR CORPORATION | | HT4053-4-9 | 97928 | HUCK INTL INC | | ST3M740-4-L9 | 007R1 | TWIST TITE MFG, INC | | ST3M740-4-9 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M740-4L9 | 0PTK6 | SPS TECHNOLOGIES INC | | ST3M740-4L9 | 17446 | HUCK INTERNATIONAL, INC | | ST3M740-4L9 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M740-4L9 | 60615 | SPACE INSTRUMENTS INC | | ST3M740-4L9 | 73197 | HI-SHEAR CORPORATION | | ST3M740-4L9 | 76301 | THE BOEING COMPANY | | ST3M740-4-9 | 76301 | THE BOEING COMPANY | | HT4053-4-9A | 80539 | SPS TECHNOLOGIES, LLC | | ST3M740-4L9 | 80539 | SPS TECHNOLOGIES, LLC | | HT4053-4-9A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M740-4-9 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4053-4-9A | 97928 | HUCK INTL INC | | HT4053-4-9A | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4053-4-9A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M740-4L9 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M740-4L9 | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION |
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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 | 0.444 INCHES MINIMUM AND | | 0.494 INCHES MAXIMUM | | FASTENER LENGTH | 1.016 INCHES MINIMUM AND | | 1.046 INCHES MAXIMUM | | MATERIAL | STEEL COMP 8740 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | ALUMINUM AND | | CHROMATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-83488 TYPE 2 CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND | | 43.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH | | 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 | 0.552 INCHES MINIMUM AND | | 0.572 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS |
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