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National Stock Number:
5305-00-305-1334
Federal Supply Class:
5305
National Item Identification Number:
003051334
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:
| 68A450996-2001 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.900 INCHES MINIMUM AND 1.910 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 2.038 INCHES NOMINAL | | GRIP DIAMETER | 0.2481 INCHES MINIMUM AND 0.2487 INCHES MAXIMUM | | GRIP LENGTH | 1.613 INCHES NOMINAL | | HEAD DIAMETER | 0.373 INCHES MINIMUM AND 0.374 INCHES MAXIMUM | | HEAD HEIGHT | 0.560 INCHES NOMINAL | | HEAD STYLE | FILLISTER | | INTERNAL DRIVE STYLE | SLOT | | MATERIAL | STEEL COMP 4340 OVERALL | | MINIMUM TENSILE STRENGTH | 15000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | PS23041,FSCM 76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.425 INCHES MINIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNF |
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