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National Stock Number:
5305-00-805-4253
Federal Supply Class:
5305
National Item Identification Number:
008054253
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:
| 51B221-32H | 06725 | SPS TECHNOLOGIES, LLC | | 51B221-32H | 0JRC1 | NORTHROP GRUMMAN TECHNICAL SERVICES, INC. | | 51B221-32H | 27624 | SPS TECHNOLOGIES LLC | | 51B221-32H | 73197 | HI-SHEAR CORPORATION | | 51B221-32H | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | 51B221-32H | 80539 | SPS TECHNOLOGIES, LLC | | 51B221-32H | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B221-32H | 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 | 0.117 INCHES NOMINAL FIRST HOLE | | FASTENER LENGTH | 2.260 INCHES MINIMUM AND 2.277 INCHES MAXIMUM | | GRIP DIAMETER | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM | | GRIP LENGTH | 1.969 INCHES MINIMUM AND 1.999 INCHES MAXIMUM | | HEAD DIAMETER | 0.391 INCHES NOMINAL | | HEAD HEIGHT | 0.109 INCHES NOMINAL | | HEAD STYLE | BUTTON | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | MATERIAL | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 6150 OR STEEL COMP 8735 OVERALL | | MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.070 INCHES NOMINAL FIRST HOLE | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TY 1 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-416,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.261 INCHES MINIMUM AND 0.308 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 32 | | THREAD SERIES DESIGNATOR | UNC |
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