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National Stock Number:
5306-01-481-0088
Federal Supply Class:
5306
National Item Identification Number:
014810088
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:
| LB52T12-27 | 73197 | HI-SHEAR CORPORATION | | LB52T12-27 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M833V12T27 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| CRITICALITY CODE JUSTIFICATION | FEAT | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.947 INCHES NOMINAL FIRST HOLE | | FASTENER LENGTH | 3.442 INCHES NOMINAL | | GRIP DIAMETER | 0.7485 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM | | GRIP LENGTH | 1.688 INCHES NOMINAL | | HEAD HEIGHT | 0.351 INCHES NOMINAL | | HEAD STYLE | HEXAGON | | LOCKING FEATURE | KNURLED LOCKING FEATURE | | PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT-SELF RETAINING,POSITIVE LOCKING,HEX HEAD,EXTENDED THREAD (WITH INHIBITOR) | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | TITANIUM ALLOY UNS R56400 OVERALL | | NOMINAL THREAD DIAMETER | 0.750 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM FIRST HOLE | | SPECIAL FEATURES | THIS PART IS INTENDED FOR USE WITH 3M891 SERIES NUT IN CRITICAL SINGLE POINT CONNECTIONS IN CONTROL SYSTEMS WHERE LOSS OF THE BOLT WILL AFFECT SAFETY OF FLIGHT:BOLT HAS TWO DRILLED HOLES SHANK 90 DEGREES APART:BOLT COMES WITH INHIBITOR THREAD 0.5625-18 UNJF-2B | | WIDTH BETWEEN FLATS | 1.052 INCHES MINIMUM AND 1.060 INCHES MAXIMUM | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 1.259 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 16 |
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