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National Stock Number:
5305-01-478-5479
Federal Supply Class:
5305
National Item Identification Number:
014785479
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:
| 93926-5-13 | 56878 | SPS TECHNOLOGIES, LLC | | 93926-5-13 | 80539 | SPS TECHNOLOGIES, LLC | | AIC618-5-13 | 06725 | SPS TECHNOLOGIES, LLC | | GS1009-5-13 | 1EM77 | B & B SPECIALTIES INC | | C20645-5-13 | 81755 | LOCKHEED MARTIN CORPORATION |
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Techincal Specification:
| INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.8125 INCHES NOMINAL | | GRIP DIAMETER | 0.311 INCHES MINIMUM AND | | 0.312 INCHES MAXIMUM | | POINT STYLE | FLAT | | THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.3125 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.501 INCHES NOMINAL | | FASTENER LENGTH | 1.2985 INCHES MINIMUM AND | | 1.3285 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | MINIMUM TENSILE STRENGTH | 6300 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.429 INCHES MINIMUM AND | | 0.479 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM |
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