5306-00-822-6941, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-00-822-6941

Federal Supply Class:
5306

National Item Identification Number:
008226941

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:

394188

77445

RTX CORPORATION

Techincal Specification:

CRITICALITY CODE JUSTIFICATION	FEAT
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.795 INCHES MINIMUM AND 0.815 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	0.905 INCHES MINIMUM AND 0.925 INCHES MAXIMUM
GRIP DIAMETER	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH	0.520 INCHES MINIMUM AND 0.540 INCHES MAXIMUM
HARDNESS RATING	30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT	0.151 INCHES MINIMUM AND 0.161 INCHES MAXIMUM
HEAD STYLE	HEXAGON
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
NONSTANDARD THREAD PITCH DIAMETER	+0.2213 TO 0.2238 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.065 INCHES MINIMUM AND 0.072 INCHES MAXIMUM FIRST HOLE
SPECIAL FEATURES	THIS PART MEETS THE Y REQUIREMENTS DUE TO CRITICAL FEATURES, TOLERANCES,MATERIAL PROPERTIES AND MANUFACTURING PROCESS. FAILURE COULD RESULT IN LOSS OR SUBSTANTIAL DAMAGE TO WEAPON SYSTEM, DEATH OR SERIOUS INJURY.
WIDTH BETWEEN FLATS	0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM
SURFACE FINISH	125.0 MICROINCHES TOP OF HEAD
SURFACE FINISH	32.0 MICROINCHES THREADS
SURFACE FINISH	63.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH	63.0 MICROINCHES GRIP
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.905 INCHES MINIMUM AND 0.925 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNJF
THREAD QUANTITY PER INCH	28

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