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National Stock Number:
5305-01-395-0150
Federal Supply Class:
5305
National Item Identification Number:
013950150
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:
| 11883-4L21 | 59563 | REID PRODUCTS INC. | | 3M926-4L21 | 06980 | COMMUNICATIONS & POWER INDUSTRIES LLC | | 3M926-4L21 | 17446 | HUCK INTERNATIONAL, INC | | 3M926-4L21 | 56878 | SPS TECHNOLOGIES, LLC | | 3M926-4L21 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | 3M926-4L21 | 60516 | WEST COAST AEROSPACE, INC. | | HT4068-4-21A | 73197 | HI-SHEAR CORPORATION | | 3M926-4L21 | 76301 | THE BOEING COMPANY | | 3M926-4L21 | 80539 | SPS TECHNOLOGIES, LLC | | 3M926-4L21 | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4068-4-21A | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.0250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.469 INCHES NOMINAL | | FASTENER LENGTH | 1.811 INCHES MINIMUM AND | | 1.841 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 OVERALL | | SURFACE TREATMENT | ALUMINUM AND | | CHROMATE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.390 INCHES MINIMUM AND | | 0.395 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | GRIP LENGTH | 1.362 INCHES MINIMUM AND | | 1.382 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM | | FEATURES PROVIDED | CETYL ALCOHOL LUBRICANT |
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