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National Stock Number:
5305-00-285-9229
Federal Supply Class:
5305
National Item Identification Number:
002859229
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:
| 10125110 | A486G | NIMIKKEISTOKESKUS NCB FINLAND | | 110179-4-9AS | 56878 | SPS TECHNOLOGIES, LLC | | BM33024V4-9U | 17446 | HUCK INTERNATIONAL, INC | | 110179-4-9AS | 80539 | SPS TECHNOLOGIES, LLC | | BM33024V4-9U | 97928 | HUCK INTL INC | | 110179-4-9AS | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | ST3M430V4-9AS | 007R1 | TWIST TITE MFG, INC | | HT8137-4-9AS | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M430V4-9AS | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | WC8137-4-9A | 60516 | WEST COAST AEROSPACE, INC. | | HT271A4-9 | 73197 | HI-SHEAR CORPORATION | | ST3M430V4-9AS | 76301 | THE BOEING COMPANY | | HT8137-4-9AS | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT271A4-9 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.5 DEGREES MINIMUM AND 100.5 DEGREES MAXIMUM | | FASTENER LENGTH | 1.015 INCHES MINIMUM AND 1.062 INCHES MAXIMUM | | GRIP LENGTH | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | HEAD DIAMETER | 0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM | | HEAD HEIGHT | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | NAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OR AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | TITANIUM ALLOY OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | FURNISHED WITH ONE O-RING SEAL | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 28 |
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