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National Stock Number:
5305-01-494-8431
Federal Supply Class:
5305
National Item Identification Number:
014948431
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:
| HT4020-6-20 | 0PTK6 | SPS TECHNOLOGIES INC | | HT4020-6-20 | 17446 | HUCK INTERNATIONAL, INC | | HT4020-6-20 | 73197 | HI-SHEAR CORPORATION | | HT4020-6-20 | 80539 | SPS TECHNOLOGIES, LLC | | HT4020-6-20 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4020-6-20 | 97928 | HUCK INTL INC | | ST3M652C6-20D | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M652C6-20D | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M652C6-20D | 60516 | WEST COAST AEROSPACE, INC. | | ST3M652C6-20D | 76301 | THE BOEING COMPANY | | HT4020-6-20 | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION | | HT4020-6-20 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| FASTENER LENGTH | 1.297 INCHES MINIMUM AND 1.932 INCHES MAXIMUM | | GRIP DIAMETER | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM | | GRIP LENGTH | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM | | HEAD DIAMETER | 0.7556 INCHES MINIMUM AND 0.7604 INCHES MAXIMUM | | HEAD HEIGHT | 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | NOMINAL THREAD DIAMETER | 0.3750 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 24 |
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