5306-01-581-4345 BOLT,MACHINE Index 5306-01-581-4357 BOLT,CLOSE TOLERANCE

National Stock Number:
5306-01-581-4352

Federal Supply Class:
5306

National Item Identification Number:
015814352

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.


Manufacturer Information:
BACB30UU5K1381205THE BOEING COMPANY


Techincal Specification:
THREAD SERIES DESIGNATORUNJF
NOMINAL THREAD DIAMETER0.312 INCHES
THREAD QUANTITY PER INCH24
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.449 INCHES MINIMUM AND
0.459 INCHES MAXIMUM
FASTENER LENGTH1.251 INCHES MINIMUM AND
1.281 INCHES MAXIMUM
MATERIALNICKEL ALLOY 718 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OR
AMS 5962 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTALUMINUM OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONBMS 10-85, TYPE 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
HEAD STYLEDOUBLE HEXAGON
HEAD HEIGHT0.177 INCHES MINIMUM AND
0.197 INCHES MAXIMUM
WIDTH BETWEEN FLATS0.492 INCHES MINIMUM AND
0.502 INCHES MAXIMUM
GRIP LENGTH0.802 INCHES MINIMUM AND
0.822 INCHES MAXIMUM
GRIP DIAMETER0.311 INCHES MINIMUM AND
0.312 INCHES MAXIMUM
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
32.0 MICROINCHES GRIP
32.0 MICROINCHES THREADS
PART NAME ASSIGNED BY CONTROLLING AGENCYBOLT, 12 POINT HEAD, SHORT THREAD, CLOSE TOLERANCE, NICKEL ALLOY 718, 125 KSI MINIMUM SHEAR


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