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National Stock Number:
5305-01-385-8191
Federal Supply Class:
5305
National Item Identification Number:
013858191
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:
| NAS1143-6 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE |
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Techincal Specification:
| GRIP DIAMETER | 0.438 INCHES NOMINAL | | GRIP LENGTH | 0.714 INCHES NOMINAL | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | SPECIAL FEATURES | MACHINE-PAN HEAD MODIFIED, CLOSE TOLERANCE, SHORT THREAD, TORQ-SET, ALLOY STEEL, CADMIUM PLATED PER QQ-P-416, TYPE II, CLASS 2, 160,000 TO 180,000 PSI UTS, SHALL BE IN ACCORDANCE WITH ALL REQUIREMENTS AS SPECIFIED IN NATIONAL AEROSPACE STANDARD NAS1141 THRU 1148 | | THREAD LENGTH | 0.276 INCHES NOMINAL | | THREAD CLASS | 3A | | THREAD QUANTITY PER INCH | 32 | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) |
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