NSN 5305-01-256-3050

Part Details | CLOSE TOLERANCE SCREW

5305-01-256-3050 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: ST3M7334L3, ST3M733-4L3, 119354L3, 11935-4L3, 5305-01-256-3050, 01-256-3050, 5305012563050, 012563050

Supply Group (FSG) NSN Assigned NIIN Item Name Code (INC)
53JUN 03, 198701-256-305029294 ( SCREW, CLOSE TOLERANCE )
REFERENCE DRAWINGS & PICTURES

HEXAGON COUNTERSUNK

HIGH-TORQUE

Cross Reference | NSN 5305-01-256-3050
Part Number Cage Code Manufacturer
ST3M733-4L376301BOEING COMPANY, THEDBA BOEING
11935-4L359563REID PRODUCTS INC.DBA REID PRODUCTS
Technical Data | NSN 5305-01-256-3050
Characteristic Specifications
THREAD SERIES DESIGNATOR UNF
NOMINAL THREAD DIAMETER0.250 INCHES
THREAD QUANTITY PER INCH28
THREAD CLASS3A
THREAD DIRECTION RIGHT-HAND
THREAD LENGTH0.469 INCHES NOMINAL
FASTENER LENGTH0.657 INCHES MINIMUM
HEAD STYLE0 HEXAGON COUNTERSUNK
HEAD DIAMETER0.508 INCHES MAXIMUM
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
INTERNAL DRIVE STYLE HIGH-TORQUE
GRIP LENGTH0.188 INCHES NOMINAL
GRIP DIAMETER0.2490 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM