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National Stock Number:
5305-01-337-3272
Federal Supply Class:
5305
National Item Identification Number:
013373272
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:
| BACB30MS4R12 | 17446 | HUCK INTERNATIONAL, INC | | BACB30MS4R12 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30MS4R12 | 73197 | HI-SHEAR CORPORATION | | BACB30MS4R12 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30MS4R12 | 81205 | THE BOEING COMPANY | | BACB30MS4R12 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30MS4R12 | 97928 | HUCK INTL INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM | | FEATURES PROVIDED | CETYL ALCOHOL LUBRICANT | | GRIP LENGTH | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM | | GRIP DIAMETER | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM | | HEAD DIAMETER | 0.465 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.425 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 28 |
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