NSN 5305-00-021-7789
Part Details | CLOSE TOLERANCE SCREW
5305-00-021-7789 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.
Alternate Parts: CA2730446, CA2730-4-46, AS1040446, AS104-04-46, CC00035446, CC00035-4-46, 5305-00-021-7789, 00-021-7789, 5305000217789, 000217789
Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
---|---|---|---|
53 | JUN 26, 1968 | 00-021-7789 | 29294 ( SCREW, CLOSE TOLERANCE ) |
REFERENCE DRAWINGS & PICTURES
CROWNED HEXAGON

HEXAGON

Cross Reference | NSN 5305-00-021-7789
Part Number | Cage Code | Manufacturer |
---|---|---|
CA2730-4-46 | 29372 | ARCONIC GLOBAL FASTENERS & RINGS,INC. |
AS104-04-46 | 84256 | AVIBANK MFG., INC. |
CC00035-4-46 | 81755 | LOCKHEED MARTIN CORPORATIONDBA LOCKHEED MARTIN AERONAUTICS |
Technical Data | NSN 5305-00-021-7789
Characteristic | Specifications |
---|---|
THREAD SERIES DESIGNATOR | UNF |
NOMINAL THREAD DIAMETER | 0.250 INCHES |
THREAD QUANTITY PER INCH | 28 |
THREAD CLASS | 3A |
THREAD DIRECTION | RIGHT-HAND |
THREAD LENGTH | 0.270 INCHES NOMINAL |
FASTENER LENGTH | 3.313 INCHES MINIMUM AND 3.353 INCHES MAXIMUM |
HEAD STYLE | 9 CROWNED HEXAGON |
HEAD DIAMETER | 0.3737 INCHES MINIMUM AND 0.3742 INCHES MAXIMUM |
HEAD HEIGHT | 0.253 INCHES MINIMUM AND 0.273 INCHES MAXIMUM |
INTERNAL DRIVE STYLE | HEXAGON |
WIDTH ACROSS FLATS | 0.188 INCHES NOMINAL |
GRIP LENGTH | 2.875 INCHES MINIMUM AND 2.895 INCHES MAXIMUM |
GRIP DIAMETER | 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM |