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National Stock Number:
5305-01-237-5116
Federal Supply Class:
5305
National Item Identification Number:
012375116
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:
| 3M46-4-18 | 76301 | THE BOEING COMPANY | | 3M46-4-18 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 54266-4-18 | 56878 | SPS TECHNOLOGIES, LLC | | HT408A-4-18 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT408A-4-18 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4UA-CA-4-18 | 73197 | HI-SHEAR CORPORATION | | HT4UA-CA-4-18 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | HTS467-4-18 | 17446 | HUCK INTERNATIONAL, INC | | HTS467-4-18 | 97928 | HUCK INTL INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 1.578 INCHES MINIMUM AND 1.625 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.1115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM | | HEAD DIAMETER | 0.501 INCHES MINIMUM AND 0.506 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | 3-48 CAGE 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | FURNISHED WITH O-RING | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | 3-48 CAGE 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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