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National Stock Number:
5305-01-338-6798
Federal Supply Class:
5305
National Item Identification Number:
013386798
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:
| HT4075VS4-7-20 | 03950 | NAVAL INVENTORY CONTROL POINT MECHANICSBURG | | HT4075VS4-7-20 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4075VS4-7-20 | 17419 | DEUTSCH CO THE | | HT4075VS4-7-20 | 17446 | HUCK INTERNATIONAL, INC | | HT4075VS4-7-20 | 56878 | SPS TECHNOLOGIES, LLC | | HT4075VS4-7-20 | 73197 | HI-SHEAR CORPORATION | | HT4075VS4-7-20 | 80539 | SPS TECHNOLOGIES, LLC | | HT4075VS4-7-20 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT4075VS4-7-20 | 97928 | HUCK INTL INC | | HT4075VS4-7-20 | 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 | 0.892 INCHES MINIMUM AND 0.922 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM | | HEAD DIAMETER | 0.456 INCHES MINIMUM AND 0.508 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT | | SPECIAL FEATURES | TAPPED HOLE IN HEAD 0.138-32 UNJC-3B THREADS. DISTANCE FROM TOP OF HEAD TO INJECTION PORT 0.200 NOM. IN. LG; 0.060 NOM. WIDE | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.469 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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