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National Stock Number:
5305-00-464-2774
Federal Supply Class:
5305
National Item Identification Number:
004642774
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:
| 106334-4-14 | 56878 | SPS TECHNOLOGIES, LLC | | 106334-4-14 | 80539 | SPS TECHNOLOGIES, LLC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.5 DEGREES MINIMUM AND 100.5 DEGREES MAXIMUM | | FASTENER LENGTH | 1.185 INCHES MINIMUM AND 1.222 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM | | HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL | | HEAD DIAMETER | 0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | MATERIAL DOCUMENT AND CLASSIFICATION | SPS-M-107 CAGEC 56878 MFR REF SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL OVERALL | | MINIMUM TENSILE STRENGTH | 132000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.316 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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