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National Stock Number:
5305-01-389-9412
Federal Supply Class:
5305
National Item Identification Number:
013899412
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:
| 5305PL0788132 | 9009H | INSPEKTORAT WSPARCIA SIL ZBROJNYCH | | MS3369-307 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| FASTENER LENGTH | 0.810 INCHES MINIMUM AND 0.830 INCHES MAXIMUM | | GRIP LENGTH | 0.448 INCHES MINIMUM AND 0.464 INCHES MAXIMUM | | GRIP DIAMETER | 0.1889 INCHES MINIMUM AND 0.1894 INCHES MAXIMUM | | HEAD HEIGHT | 0.096 INCHES MINIMUM AND 0.110 INCHES MAXIMUM | | HEAD STYLE | CROWNED HEXAGON | | INTERNAL DRIVE STYLE | SLOT | | MATERIAL | STEEL COMP 630 OVERALL | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | WIDTH BETWEEN FLATS | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.236 INCHES MINIMUM AND 0.286 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 32 |
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