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National Stock Number:
5305-01-048-6098
Federal Supply Class:
5305
National Item Identification Number:
010486098
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:
| 51B581-7-14H | 06725 | SPS TECHNOLOGIES, LLC | | 51B581-7-14H | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B581-7-14H | 0JRC1 | NORTHROP GRUMMAN TECHNICAL SERVICES, INC. | | 51B581-7-14H | 27624 | SPS TECHNOLOGIES LLC | | 51B581-7-14H | 73197 | HI-SHEAR CORPORATION | | 51B581-7-14H | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | 51B581-7-14H | 79U29 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | 51B581-7-14H | 80539 | SPS TECHNOLOGIES, LLC | | 51B581-7-14H | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 51B581-7-14H | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.438 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.427 INCHES MINIMUM AND | | 0.494 INCHES MAXIMUM | | FASTENER LENGTH | 1.312 INCHES MINIMUM AND | | 1.359 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OR | | STEEL COMP 4340 OR | | STEEL COMP 4140 OR | | STEEL COMP 8740 OVERALL | | SURFACE TREATMENT | CADMIUM AND | | CHROMATE OR | | CADMIUM OVERALL | | HARDNESS RATING | 39.0 ROCKWELL C MINIMUM AND | | 43.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.662 INCHES MINIMUM AND | | 0.668 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.865 INCHES MINIMUM AND | | 0.885 INCHES MAXIMUM | | GRIP DIAMETER | 0.4360 INCHES MINIMUM AND | | 0.4370 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.204 INCHES NOMINAL FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.096 INCHES MINIMUM AND | | 0.116 INCHES MAXIMUM FIRST HOLE | | SPECIFICATION/STANDARD DATA | 76823-51B58 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
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