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National Stock Number:
5305-01-186-3091
Federal Supply Class:
5305
National Item Identification Number:
011863091
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:
| MS21125B422 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | MS21125B422 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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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 | 1.793 INCHES MINIMUM AND | | 1.813 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 FASTENER | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5678 ASSN STD 1ST MATERIAL RESPONSE OR | | ASTM A580 COND. A ASSN STD 2ND MATERIAL RESPONSE SPRING | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | MINIMUM TENSILE STRENGTH | 63000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT CHAMFER | | HEAD DIAMETER | 0.477 INCHES MINIMUM AND | | 0.492 INCHES MAXIMUM | | HEAD HEIGHT | 0.126 INCHES MINIMUM AND | | 0.141 INCHES MAXIMUM | | INTERNAL DRIVE STYLE | SLOT | | LOCKING FEATURE | DETENT BALL GRIP | | GRIP LENGTH | 1.375 INCHES MINIMUM AND | | 1.391 INCHES MAXIMUM | | GRIP DIAMETER | 0.2487 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES GRIP | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.698 INCHES MINIMUM AND | | 1.718 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND | | 0.086 INCHES MAXIMUM FIRST HOLE |
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