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National Stock Number:
5305-01-218-1458
Federal Supply Class:
5305
National Item Identification Number:
012181458
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:
| AS292-4-15 | 84256 | AVIBANK MFG., INC. | | GB510CG415 | 26512 | NORTHROP GRUMMAN SYSTEMS CORPORATION | | GB510CG415 | 27624 | SPS TECHNOLOGIES LLC | | GB510CG415 | 56878 | SPS TECHNOLOGIES, LLC | | GB510CG415 | 73197 | HI-SHEAR CORPORATION | | GB510CG415 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | GB510CG415 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.277 INCHES MINIMUM AND | | 0.328 INCHES MAXIMUM | | FASTENER LENGTH | 1.356 INCHES MINIMUM AND | | 1.376 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 43.0 ROCKWELL C MINIMUM AND | | 47.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 63000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.449 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | LOCKING FEATURE | DETENT BALL GRIP | | GRIP LENGTH | 1.048 INCHES MINIMUM AND | | 1.079 INCHES MAXIMUM | | GRIP DIAMETER | 0.2487 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.361 INCHES MINIMUM AND | | 1.381 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND | | 0.086 INCHES MAXIMUM FIRST HOLE | | SPECIAL FEATURES | INTERNAL DRIVE RIBBED |
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