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National Stock Number:
5305-01-337-3795
Federal Supply Class:
5305
National Item Identification Number:
013373795
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:
| BACB30MS7R20 | 17446 | HUCK INTERNATIONAL, INC | | BACB30MS7R20 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30MS7R20 | 73197 | HI-SHEAR CORPORATION | | BACB30MS7R20 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30MS7R20 | 81205 | THE BOEING COMPANY | | BACB30MS7R20 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30MS7R20 | 97928 | HUCK INTL INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 1.929 INCHES MINIMUM AND 1.959 INCHES MAXIMUM | | FEATURES PROVIDED | CETYL ALCOHOL LUBRICANT | | GRIP LENGTH | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM | | GRIP DIAMETER | 0.4360 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM | | HEAD DIAMETER | 0.829 INCHES MINIMUM AND 0.892 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | TITANIUM ALLOY UNS R56400 OVERALL | | NOMINAL THREAD DIAMETER | 0.438 INCHES | | SPECIAL FEATURES | RED DYE OR PAINT ON THREAD END BEFORE LUBRICATION | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD32.0 MICROINCHES GRIP32.0 MICROINCHES THREADS | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | BAC 5861,CAGE81205 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | PHOSPHATE OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.694 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 20 |
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