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National Stock Number:
5305-01-482-1579
Federal Supply Class:
5305
National Item Identification Number:
014821579
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:
| 123179A4R06 | 80539 | SPS TECHNOLOGIES, LLC | | AIC4040-4-06R | 06725 | SPS TECHNOLOGIES, LLC | | SC1786R-4-06 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | PBF1381-2406 | 27624 | SPS TECHNOLOGIES LLC | | LE111-0035-2406 | 43999 | THE BOEING COMPANY | | LE111-0035-2406 | 57928 | SONIC INDUSTRIES, 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 | 0.425 INCHES NOMINAL | | FASTENER LENGTH | 0.785 INCHES MINIMUM AND | | 0.815 INCHES MAXIMUM | | MATERIAL | STEEL COMP 4140 OR | | STEEL COMP 8740 OR | | STEEL COMP 4340 OR | | STEEL COMP 8735 OR | | STEEL COMP 6150 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | NAS498 NATIONAL SPEC ALL MATERIAL RESPONSES OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | 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 | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.375 INCHES NOMINAL | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM |
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