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National Stock Number:
5305-01-347-4022
Federal Supply Class:
5305
National Item Identification Number:
013474022
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:
| HT271A4-10M | 73197 | HI-SHEAR CORPORATION | | HT271A4-10M | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M430V4-10ASM | 56878 | SPS TECHNOLOGIES, LLC | | ST3M430V4-10ASM | 76301 | THE BOEING COMPANY | | ST3M430V4-10ASM | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M430V4-10ASM | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION |
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Techincal Specification:
| COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM | | FASTENER LENGTH | 1.078 INCHES MINIMUM AND 1.125 INCHES MAXIMUM | | FEATURES PROVIDED | O RING AND DRY FILM LUBRICANT AND CETYL ALCOHOL LUBRICANT | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM | | HEAD DIAMETER | 0.5018 INCHES MINIMUM AND 0.5066 INCHES MAXIMUM | | HEAD HEIGHT | 0.106 INCHES MINIMUM AND 0.108 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE FASTENER | | MATERIAL | TITANIUM ALLOY UNS R56400 FASTENER | | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | FLUORSILICON RUBBER O-RING,PER MIL-R-25988 TY1,CL 1,GRADE 70 LUBRICANTS APPLIED ON SHANK AND THREADS | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD32.0 MICROINCHES GRIP32.0 MICROINCHES THREADS | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.469 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 29 |
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