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National Stock Number:
5305-01-185-8047
Federal Supply Class:
5305
National Item Identification Number:
011858047
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:
| BACB30EL4CN6 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30EL4CN6 | 17446 | HUCK INTERNATIONAL, INC | | BACB30EL4CN6 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30EL4CN6 | 73197 | HI-SHEAR CORPORATION | | BACB30EL4CN6 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30EL4CN6 | 81205 | THE BOEING COMPANY | | BACB30EL4CN6 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30EL4CN6 | 97928 | HUCK INTL INC | | BACB30EL4CN6 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.291 INCHES MINIMUM AND | | 0.341 INCHES MAXIMUM | | FASTENER LENGTH | 0.676 INCHES MINIMUM AND | | 0.706 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OR | | STEEL COMP 4140 OR | | STEEL COMP 8740 OR | | STEEL COMP 8735 OR | | STEEL COMP 6150 OR | | STEEL COMP 4130 OVERALL | | SURFACE TREATMENT | NICKEL AND | | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.350 INCHES MINIMUM AND | | 0.399 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 0.365 INCHES MINIMUM AND | | 0.385 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS |
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