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National Stock Number:
5305-01-517-3073
Federal Supply Class:
5305
National Item Identification Number:
015173073
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:
| BACB30LK4-6 | 81205 | THE BOEING COMPANY |
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Techincal Specification:
| FASTENER LENGTH | 0.764 INCHES NOMINAL | | GRIP DIAMETER | 0.2479 INCHES MINIMUM AND 0.2485 INCHES MAXIMUM | | GRIP LENGTH | 0.375 INCHES NOMINAL | | HEAD DIAMETER | 0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM | | HEAD HEIGHT | 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM | | HEAD STYLE | PAN | | HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM | | HOLE CONFIGURATION STYLE | ROUND | | HOLE QUANTITY | 2 | | HOLE TYPE | DRILLED | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE II | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | IRON ALLOY 660 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.389 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJC | | THREAD QUANTITY PER INCH | 28 |
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