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National Stock Number:
5305-01-520-4354
Federal Supply Class:
5305
National Item Identification Number:
015204354
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:
| AIC618-5-28 | 06725 | SPS TECHNOLOGIES, LLC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.476 INCHES MINIMUM AND | | 0.526 INCHES MAXIMUM | | FASTENER LENGTH | 1.735 INCHES MINIMUM AND | | 1.765 INCHES MAXIMUM | | MATERIAL | STEEL COMP H11 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | CDA000 ASSN STD ALL MATERIAL RESPONSES OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS672 ASSN STD ALL TREATMENT RESPONSES OVERALL | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND | | 49.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.429 INCHES MINIMUM AND | | 0.479 INCHES MAXIMUM | | COUNTERSINK ANGLE | 90.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 1.234 INCHES MINIMUM AND | | 1.264 INCHES MAXIMUM | | GRIP DIAMETER | 0.311 INCHES MINIMUM AND | | 0.312 INCHES MAXIMUM | | PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW-LOW HD, SKIRT HD |
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