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National Stock Number:
5305-01-521-5144
Federal Supply Class:
5305
National Item Identification Number:
015215144
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:
| BACS12HW5AU14 | 06725 | SPS TECHNOLOGIES, LLC | | BACS12HW5AU14 | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | BACS12HW5AU14 | 77272 | THE BOEING COMPANY | | BACS12HW5AU14 | 81205 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.3125 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.375 INCHES MINIMUM | | FASTENER LENGTH | 1.235 INCHES MINIMUM AND | | 1.265 INCHES MAXIMUM | | MATERIAL | IRON ALLOY 660 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 A286 ASSN STD SINGLE MATERIAL RESPONSE OR | | AMS 5732 A286 ASSN STD SINGLE MATERIAL RESPONSE OR | | AMS 5737 A286 ASSN STD SINGLE MATERIAL RESPONSE OR | | AMS 5853 A268 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS-QQ-P-35, TYPE II OR VIII ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | FLAT CHAMFER | | HEAD DIAMETER | 0.594 INCHES MINIMUM AND | | 0.615 INCHES MAXIMUM | | HEAD HEIGHT | 0.203 INCHES MINIMUM AND | | 0.218 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | TORX | | SPLINE MINOR DIAMETER | 0.157 INCHES MINIMUM AND | | 0.160 INCHES MAXIMUM | | SPLINE MAJOR DIAMETER | 0.219 INCHES MINIMUM AND | | 0.222 INCHES MAXIMUM | | LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN OVERALL | | GRIP LENGTH | 0.865 INCHES MINIMUM AND | | 0.885 INCHES MAXIMUM | | GRIP DIAMETER | 0.3115 INCHES MINIMUM AND | | 0.3120 INCHES MAXIMUM | | SPECIAL FEATURES | PER ASME B46.1. "D" DIAMETER UNDERSIDE OF HEAD, ROOT OF THREADS AND THREAD FLANKS 32 MICROINCHES RA. ALL OTHER SURFACES, 125 MICROINCHES RA. | | CRITICALITY CODE JUSTIFICATION | AGAV | | PART NAME ASSIGNED BY CONTROLLING AGENCY | SCREW, PAN HEAD, CLOSE TOLERANCE,SHORT THREAD, SIX LOBE |
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