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National Stock Number:
5305-01-273-4382
Federal Supply Class:
5305
National Item Identification Number:
012734382
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:
| SS5112-516 | 16258 | SPACE-LOK, INC. | | SS5112-516 | 73197 | HI-SHEAR CORPORATION | | SS5112-516 | 78286 | SIKORSKY AIRCRAFT CORPORATION | | SS5112-516 | 84256 | AVIBANK MFG., INC. | | SS5112-516 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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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 | 0.307 INCHES MINIMUM AND | | 0.357 INCHES MAXIMUM | | FASTENER LENGTH | 1.478 INCHES MINIMUM AND | | 1.498 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | CROWNED HEXAGON | | HEAD HEIGHT | 0.157 INCHES MINIMUM AND | | 0.172 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.492 INCHES MINIMUM AND | | 0.502 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | SLOT | | LOCKING FEATURE | DETENT BALL OVERALL | | GRIP LENGTH | 1.000 INCHES MINIMUM AND | | 1.016 INCHES MAXIMUM | | GRIP DIAMETER | 0.3112 INCHES MINIMUM AND | | 0.3117 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.365 INCHES MINIMUM AND | | 1.385 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND | | 0.086 INCHES MAXIMUM OVERALL | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 78286 | | MFR SOURCE CONTROLLING REFERENCE | SS5112-516 |
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