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National Stock Number:
5306-01-276-1645
Federal Supply Class:
5306
National Item Identification Number:
012761645
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:
| AS300-4-53 | 84256 | AVIBANK MFG., INC. | | LB36-4-53 | 73197 | HI-SHEAR CORPORATION | | ST3M764C4-53 | 76301 | THE BOEING COMPANY | | LB36-4-53 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 3.692 INCHES MINIMUM AND 3.698 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM | | FEATURES PROVIDED | NUT | | GRIP DIAMETER | 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM | | GRIP LENGTH | 3.312 INCHES MINIMUM AND 3.328 INCHES MAXIMUM | | HEAD HEIGHT | 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM | | HEAD STYLE | DISHED HEXAGON | | LOCKING FEATURE | RETAINER GRIP | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE FASTENER | | MATERIAL | STEEL COMP XM-13 FASTENER | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIAL FEATURES | ALSO CONTAINS PLUNGER LOCATED IN THE THREAD END OF BOLT | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 63.0 MICROINCHES GRIP | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE FASTENER | | SURFACE TREATMENT | PASSIVATE FASTENER | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.360 INCHES MINIMUM AND 0.395 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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