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National Stock Number:
5306-01-450-0725
Federal Supply Class:
5306
National Item Identification Number:
014500725
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:
| MS21297-09036 | 81755 | LOCKHEED MARTIN CORPORATION |
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Techincal Specification:
| EXTENDED WASHER DIAMETER | 1.037 INCHES MINIMUM AND 1.047 INCHES MAXIMUM | | EXTENDED WASHER THICKNESS | 0.071 INCHES MINIMUM AND 0.091 INCHES MAXIMUM | | FASTENER LENGTH | 3.185 INCHES MINIMUM AND 3.215 INCHES MAXIMUM | | GRIP DIAMETER | 0.5605 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM | | GRIP LENGTH | 2.250 INCHES MINIMUM AND 2.260 INCHES MAXIMUM | | HEAD HEIGHT | 0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM | | HEAD MINOR DIAMETER | 0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM | | HEAD STYLE | SPLINE EXTENDED WASHER | | MINIMUM TENSILE STRENGTH | 220000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.562 INCHES | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.925 INCHES MINIMUM AND 0.975 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 18 |
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