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National Stock Number:
5305-01-203-1664
Federal Supply Class:
5305
National Item Identification Number:
012031664
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:
| BACB30LU4-18 | 06170 | BAUMBACH E A MFG CO | | BACB30LU4-18 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30LU4-18 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LU4-18 | 17446 | HUCK INTERNATIONAL, INC | | BACB30LU4-18 | 17943 | FEDERAL MANUFACTURING CORP | | BACB30LU4-18 | 27624 | SPS TECHNOLOGIES LLC | | BACB30LU4-18 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30LU4-18 | 57928 | SONIC INDUSTRIES, INC. | | BACB30LU4-18 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30LU4-18 | 81205 | THE BOEING COMPANY | | BACB30LU4-18 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LU4-18 | 97928 | HUCK INTL INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 100.0 DEGREES MAXIMUM | | FASTENER LENGTH | 1.540 INCHES MINIMUM AND 1.560 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM | | HEAD DIAMETER | 0.455 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP 4340 OR STEEL COMP 8740 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.425 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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