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National Stock Number: 5305-01-038-4686
Federal Supply Class: 5305
National Item Identification Number: 010384686
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:
HT295-4D17 | 73197 | HI-SHEAR CORPORATION |
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Techincal Specification:
COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | GRIP LENGTH | 0.750 INCHES NOMINAL | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | HEAD DIAMETER | 0.507 INCHES NOMINAL | HEAD STYLE | FLAT COUNTERSUNK | INTERNAL DRIVE STYLE | HIGH-TORQUE | MATERIAL DOCUMENT AND CLASSIFICATION | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | MATERIAL | STEEL CORROSION RESISTING OVERALL | MINIMUM TENSILE STRENGTH | 125000 POUNDS PER SQUARE INCH | NOMINAL THREAD DIAMETER | 0.250 INCHES | SHANK UNTHREADED HOLE DIAMETER | 0.071 INCHES MINIMUM AND 0.076 INCHES MAXIMUM FIRST HOLE | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | SURFACE TREATMENT | PASSIVATE OVERALL | THREAD CLASS | 3A | THREAD DIRECTION | RIGHT-HAND | THREAD QUANTITY PER INCH | 28 | THREAD SERIES DESIGNATOR | UNJF |
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