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National Stock Number:
5305-01-240-7397
Federal Supply Class:
5305
National Item Identification Number:
012407397
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:
| 3M925C4-20A | 06710 | VALLEY-TODECO, INC. | | 3M925C4-20A | 06725 | SPS TECHNOLOGIES, LLC | | 3M925C4-20A | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | 3M925C4-20A | 0PTK6 | SPS TECHNOLOGIES INC | | 3M925C4-20A | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | 3M925C4-20A | 1VSL7 | HOUSTON PRECISION FASTENERS I LP | | 3M925C4-20A | 27624 | SPS TECHNOLOGIES LLC | | 3M925C4-20A | 56878 | SPS TECHNOLOGIES, LLC | | 3M925C4-20A | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | 3M925C4-20A | 59563 | REID PRODUCTS INC. | | 3M925C4-20A | 60516 | WEST COAST AEROSPACE, INC. | | 3M925C4-20A | 73197 | HI-SHEAR CORPORATION | | 3M925C4-20A | 76301 | THE BOEING COMPANY | | 3M925C4-20A | 80539 | SPS TECHNOLOGIES, LLC | | HT4067-4-20A | 17446 | HUCK INTERNATIONAL, INC | | 642AS1631-8 | 30003 | NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER | | 3M925C4-20A | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4067-4-20A | 97928 | HUCK INTL INC | | 3M925C4-20A | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | 3M925C4-20A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 1.704 INCHES MINIMUM AND 1.734 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM | | HEAD DIAMETER | 0.501 INCHES MINIMUM AND 0.507 INCHES MAXIMUM | | HEAD HEIGHT | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL COMP XM-13 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | FURNISHED WITH RUBBER O-RING | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | ALUMINUM AND CHROMATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNJF |
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