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National Stock Number:
5305-01-323-2915
Federal Supply Class:
5305
National Item Identification Number:
013232915
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:
| 10113686 | A486G | NIMIKKEISTOKESKUS NCB FINLAND | | 11925C7-25A | 59563 | REID PRODUCTS INC. | | HT4020-7-25A | 73197 | HI-SHEAR CORPORATION | | HT4020-7-25A | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-7-25A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-7-25A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M652C7-25A | 76301 | THE BOEING COMPANY |
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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 | 0.657 INCHES NOMINAL | | FASTENER LENGTH | 2.203 INCHES MINIMUM AND | | 2.250 INCHES MAXIMUM | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | SURFACE TREATMENT | PASSIVATE FASTENER | | COLOR | WHITE TOP OF HEAD | | MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.8812 INCHES MINIMUM AND | | 0.8884 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 1.552 INCHES MINIMUM AND | | 1.572 INCHES MAXIMUM | | GRIP DIAMETER | 0.4365 INCHES MINIMUM AND | | 0.4370 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS | | FEATURES PROVIDED | CETYL ALCOHOL LUBRICANT | | SPECIAL FEATURES | PAINT NON-BEARING SURFACE OF HEAD WHITE PER FED STD 595 NO. 37875; FURNISH WITH O-RING |
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