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National Stock Number:
5305-00-121-8895
Federal Supply Class:
5305
National Item Identification Number:
001218895
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:
| 106466-4-18 | 80539 | SPS TECHNOLOGIES, LLC | | AS195-4-18 | 84256 | AVIBANK MFG., INC. | | CA4520-4-18 | 29372 | HOWMET GLOBAL FASTENING SYSTEMS INC. | | MS27577-4-18 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | MS27577-4-18 | 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 | 0.282 INCHES MINIMUM AND | | 0.333 INCHES MAXIMUM | | FASTENER LENGTH | 1.543 INCHES MINIMUM AND | | 1.563 INCHES MAXIMUM | | MATERIAL | STEEL OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-B-83050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM AND | | CHROMATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND | | 41.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.449 INCHES MINIMUM AND | | 0.507 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | LOCKING FEATURE | DETENT BALL GRIP | | GRIP LENGTH | 1.125 INCHES MINIMUM AND | | 1.141 INCHES MAXIMUM | | GRIP DIAMETER | 0.2483 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES GRIP | | 63.0 MICROINCHES TOP OF HEAD | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.443 INCHES MINIMUM AND | | 1.563 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND | | 0.086 INCHES MAXIMUM FIRST HOLE |
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