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National Stock Number:
5305-01-433-4092
Federal Supply Class:
5305
National Item Identification Number:
014334092
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:
| 3M1231-1 | 06725 | SPS TECHNOLOGIES, LLC | | 3M1231-1 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 3M1231-1 | 56878 | SPS TECHNOLOGIES, LLC | | 3M1231-1 | 58845 | ABOUNDING SECURITY INC DIV OF MAA CORP | | 3M1231-1 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJC | | NOMINAL THREAD DIAMETER | 0.138 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.577 INCHES NOMINAL | | FASTENER LENGTH | 2.157 INCHES NOMINAL | | MATERIAL | IRON ALLOY 660 OVERALL | | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | | HEAD STYLE | HEXAGON | | HEAD HEIGHT | 0.080 INCHES MINIMUM AND | | 0.093 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.243 INCHES MINIMUM AND | | 0.251 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE | | GRIP LENGTH | 1.570 INCHES MINIMUM AND | | 1.590 INCHES MAXIMUM | | GRIP DIAMETER | 0.115 INCHES MINIMUM AND | | 0.138 INCHES MAXIMUM |
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