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National Stock Number:
5305-01-512-8323
Federal Supply Class:
5305
National Item Identification Number:
015128323
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:
| 3M1312-4-5 | 76301 | THE BOEING COMPANY | | CA22033-4-10-12 | 29372 | HOWMET GLOBAL FASTENING SYSTEMS INC. |
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Techincal Specification:
| CRITICALITY CODE JUSTIFICATION | AGAV | | GRIP DIAMETER | 0.249 INCHES NOMINAL | | GRIP LENGTH | 0.438 INCHES NOMINAL | | PART NAME ASSIGNED BY CONTROLLING AGENCY | (INAVY)SCREW,CLOSE TOLERANCE,AIRCRAFT | | MATERIAL | IRON ALLOY 660 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | FASTNER-CAPTIVE,100DEG REDUCED HEAD,GEAR DRIVE RECESS,A286CRES,95KSI SHEAR;NOT INTENDED FOR USE IN STRUCTURAL APPLICATIONS;USE WITH RETAINING RING 3M1239 & SELF-LOCKING PLATE NUT | | SUPPLEMENTARY FEATURES | OTHER END ITEMS ARE PLYON,AIRCRAFT 01-470-6295,01-475-5569;SUU-79A/A PYLON & SUU-80A/A PYLON;FOR F /A-18E/F APPLICATIONS | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.312 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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