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National Stock Number:
5305-01-337-5977
Federal Supply Class:
5305
National Item Identification Number:
013375977
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:
| HT357E8-21 | 73197 | HI-SHEAR CORPORATION | | HT357E8-21 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 2.064 INCHES MINIMUM AND 2.111 INCHES MAXIMUM | | FEATURES PROVIDED | O RING | | GRIP LENGTH | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM | | GRIP DIAMETER | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM | | HEAD HEIGHT | 0.157 INCHES MINIMUM AND 0.160 INCHES MAXIMUM | | HEAD DIAMETER | 0.966 INCHES MINIMUM AND 1.014 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER | | MATERIAL | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR RINGNICKEL ALLOY 718 FASTENER | | NOMINAL THREAD DIAMETER | 0.500 INCHES | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD32.0 MICROINCHES GRIP32.0 MICROINCHES THREADS | | SURFACE TREATMENT | PASSIVATE FASTENER | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.768 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 20 |
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