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National Stock Number:
5306-00-321-9217
Federal Supply Class:
5306
National Item Identification Number:
003219217
Description:
BOLT,CLOSE TOLERANCE
Detail:
An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.
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Manufacturer Information:
| 74328-4-38 | 50392 | SPS TECHNOLOGIES INC | | 74328-4-38 | 56878 | SPS TECHNOLOGIES, LLC | | AIC752-4-38 | 06725 | SPS TECHNOLOGIES, LLC | | BM3326-4-38 | 17446 | HUCK INTERNATIONAL, INC | | GS1030-4-38 | 1EM77 | B & B SPECIALTIES INC | | BM3326-4-38 | 97928 | HUCK INTL INC | | ST3M571-4-38 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M571-4-38 | 0K6Z0 | SATURN FASTENERS INC | | ST3M571-4-38 | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | S371-4-38 | 17446 | HUCK INTERNATIONAL, INC | | S11-1059-4-38 | 57928 | SONIC INDUSTRIES, INC. | | MB84-4-38 | 73197 | HI-SHEAR CORPORATION | | S371-4-38 | 97928 | HUCK INTL INC | | MB84-4-38 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | VAL23033-4-38 | 06710 | VALLEY-TODECO, INC. | | VS3060-4-38 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M571-4-38 | 16258 | SPACE-LOK, INC. | | ST3M571-4-38 | 1VSL7 | HOUSTON PRECISION FASTENERS I LP | | ST3M571-4-38 | 27624 | SPS TECHNOLOGIES LLC | | ST3M571-4-38 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M571-4-38 | 59563 | REID PRODUCTS INC. | | ST3M571-4-38 | 76301 | THE BOEING COMPANY | | ST3M571-4-38 | 80539 | SPS TECHNOLOGIES, LLC | | VS3060-4-38 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC |
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Techincal Specification:
| EXTENDED WASHER THICKNESS | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM | | EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM | | FASTENER LENGTH | 2.828 INCHES MINIMUM AND 2.858 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | HEAD HEIGHT | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM | | HEAD STYLE | DOUBLE HEXAGON W/HOLE | | MATERIAL | STEEL CORROSION RESISTING OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | WIDTH BETWEEN FLATS | 0.034 INCHES MINIMUM AND 0.313 INCHES MAXIMUM | | SURFACE TREATMENT | PASSIVATE OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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