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National Stock Number:
5305-01-406-8667
Federal Supply Class:
5305
National Item Identification Number:
014068667
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:
| 121557-4-A5PX | 56878 | SPS TECHNOLOGIES, LLC | | 121557-4-A5PX | 80539 | SPS TECHNOLOGIES, LLC | | AIC984-4-5R | 06725 | SPS TECHNOLOGIES, LLC | | C7984-4-5R | 06725 | SPS TECHNOLOGIES, LLC | | C7984-4-5R | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | C7984-4-5R | 27624 | SPS TECHNOLOGIES LLC | | VT1693F4-5X | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | H044-4-5R | 17446 | HUCK INTERNATIONAL, INC | | C7984-4-5R | 56878 | SPS TECHNOLOGIES, LLC | | C7984-4-5R | 80539 | SPS TECHNOLOGIES, LLC | | C7984-4-5R | 81755 | LOCKHEED MARTIN CORPORATION | | C7984-4-5R | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | VT1693F4-5X | 92215 | HOWMET GLOBAL FASTENING SYSTEMS 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 | 0.370 INCHES NOMINAL | | FASTENER LENGTH | 0.667 INCHES MINIMUM AND | | 0.697 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND | | 49.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.447 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.302 INCHES MINIMUM AND | | 0.322 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | SPECIFICATION/STANDARD DATA | 81755-C7984-4-5R PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |
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