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National Stock Number:
5305-01-584-7121
Federal Supply Class:
5305
National Item Identification Number:
015847121
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:
| 120-225-C4R18 | 06725 | SPS TECHNOLOGIES, LLC | | 120-225-C4R18 | 0K6Z0 | SATURN FASTENERS INC | | 120-225-C4R18 | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | 120-225-C4R18 | 1EM77 | B & B SPECIALTIES INC | | 120-225-C4R18 | 1ER65 | 3-V FASTENER CO., INC. | | 120-225-C4R18 | 1GP79 | PILGRIM SCREW CORP | | 120-225-C4R18 | 27624 | SPS TECHNOLOGIES LLC | | 120-225-C4R18 | 47253 | PILGRIM SCREW CORPORATION | | 120-225-C4R18 | 56878 | SPS TECHNOLOGIES, LLC | | 120-225-C4R18 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | 120-225-C4R18 | 62206 | B & B SPECIALTIES INC | | 120-225-C4R18 | 62384 | LFC INDUSTRIES INC. | | 120-225-C4R18 | 80539 | SPS TECHNOLOGIES, LLC | | 120-225-C4R18 | 97499 | BELL TEXTRON INC | | 120-225C4-18 | 97499 | BELL TEXTRON INC |
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Techincal Specification:
| EXTENDED WASHER THICKNESS | 0.028 INCHES MINIMUM AND 0.033 INCHES MAXIMUM | | EXTENDED WASHER DIAMETER | 0.500 INCHES NOMINAL | | FASTENER LENGTH | 1.156 INCHES NOMINAL | | GRIP DIAMETER | 0.248 INCHES MINIMUM AND 0.249 INCHES MAXIMUM | | GRIP LENGTH | 0.625 INCHES NOMINAL | | HEAD HEIGHT | 0.096 INCHES MINIMUM AND 0.106 INCHES MAXIMUM | | HEAD DIAMETER | 0.437 INCHES NOMINAL | | HEAD STYLE | ROUND EXTENDED WASHER | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE II | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | PART NAME ASSIGNED BY CONTROLLING AGENCY | WASHER HEAD SCREW | | PROPRIETARY CHARACTERISTICS | PACS | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SURFACE TREATMENT | PASSIVATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.531 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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