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National Stock Number:
5305-01-412-0840
Federal Supply Class:
5305
National Item Identification Number:
014120840
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:
| 03A416-4-14L | 1W025 | NORTHROP GRUMMAN SYSTEMS CORP | | 125301-4-14L | 80539 | SPS TECHNOLOGIES, LLC | | PBF1571-4-14L | 27624 | SPS TECHNOLOGIES LLC | | HR258-4-14L | 73197 | HI-SHEAR CORPORATION | | HR258-4-14L | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS 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 | 0.403 INCHES NOMINAL | | FASTENER LENGTH | 1.263 INCHES MINIMUM AND | | 1.293 INCHES MAXIMUM | | MATERIAL | COBALT COMP MP-35-N OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5844 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.438 INCHES MINIMUM | | COUNTERSINK ANGLE | 129.0 DEGREES MINIMUM AND | | 131.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.865 INCHES MINIMUM AND | | 0.885 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | FEATURES PROVIDED | DRY FILM LUBRICANT | | SPECIAL FEATURES | DRY FILM LUBRICANT ON THREADS ONLY |
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