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National Stock Number:
5305-00-810-1266
Federal Supply Class:
5305
National Item Identification Number:
008101266
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:
| 51B334-40H | 06725 | SPS TECHNOLOGIES, LLC | | 51B334-40H | 06954 | BERCO MFG CO | | 51B334-40H | 0JRC1 | NORTHROP GRUMMAN TECHNICAL SERVICES, INC. | | 51B334-40H | 27624 | SPS TECHNOLOGIES LLC | | 51B334-40H | 56878 | SPS TECHNOLOGIES, LLC | | 51B334-40H | 73197 | HI-SHEAR CORPORATION | | 51B334-40H | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | 51B334-40H | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B334-40H | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 0.116 INCHES NOMINAL FIRST HOLE | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 2.770 INCHES MINIMUM AND 2.837 INCHES MAXIMUM | | GRIP DIAMETER | 0.2482 INCHES MINIMUM AND 0.2487 INCHES MAXIMUM | | GRIP LENGTH | 2.470 INCHES MINIMUM AND 2.490 INCHES MAXIMUM | | HEAD DIAMETER | 0.507 INCHES NOMINAL | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | MATERIAL | STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 6150 OR STEEL COMP E4340 OVERALL | | MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES NOMINAL FIRST HOLE | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 1 FED SPEC 1ST TREATMENT RESPONSE OR QQ-P-416 TY 2 FED SPEC 2ND TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OR CADMIUM AND CHROMATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.316 INCHES MINIMUM | | THREAD SERIES DESIGNATOR | UNF | | THREAD QUANTITY PER INCH | 28 |
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