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National Stock Number:
5305-01-284-8378
Federal Supply Class:
5305
National Item Identification Number:
012848378
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:
| 121558-5-A28P | 56878 | SPS TECHNOLOGIES, LLC | | 121558-5-A28P | 80539 | SPS TECHNOLOGIES, LLC | | AIC985-5-28 | 06725 | SPS TECHNOLOGIES, LLC | | C7985-5-28 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | C7985-5-28 | 56878 | SPS TECHNOLOGIES, LLC | | C7985-5-28 | 81755 | LOCKHEED MARTIN CORPORATION | | VT1694F5-28 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | H185-5-28 | 17446 | HUCK INTERNATIONAL, INC | | PBF1166-5-28 | 27624 | SPS TECHNOLOGIES LLC | | VT1694F5-28 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 2.251 INCHES NOMINAL | | GRIP DIAMETER | 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM | | GRIP LENGTH | 1.750 INCHES NOMINAL | | HEAD DIAMETER | 0.429 INCHES MINIMUM AND 0.479 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | MATERIAL | STEEL COMP H11 OVERALL | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.501 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 24 |
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