5306-00-167-3925, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-00-167-3925

Federal Supply Class:
5306

National Item Identification Number:
001673925

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:

AN177-20	88044	AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE
AN177H20	88044	AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE
B6812	81349	MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.906 INCHES MINIMUM AND 1.938 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH	2.078 INCHES MINIMUM AND 2.125 INCHES MAXIMUM
GRIP DIAMETER	0.4362 INCHES MINIMUM AND 0.4367 INCHES MAXIMUM
GRIP LENGTH	1.422 INCHES MINIMUM AND 1.454 INCHES MAXIMUM
HARDNESS RATING	26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT	0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM
HEAD LENGTH	0.615 INCHES MINIMUM AND 0.627 INCHES MAXIMUM
HEAD STYLE	HEXAGON
HOLE CONFIGURATION STYLE	HEXAGON FLATS
HOLE DIAMETER	0.070 INCHES NOMINAL
HOLE QUANTITY	1
HOLE TYPE	DRILLED
MATERIAL	STEEL COMP 4130 OR STEEL COMP 8740 OR STEEL COMP 8640 OR STEEL COMP 8735 OR STEEL COMP 4037 OR STEEL COMP 4140 OVERALL
MINIMUM TENSILE STRENGTH	125000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.437 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.106 INCHES MINIMUM FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.116 INCHES MAXIMUM SECOND HOLE
WIDTH BETWEEN FLATS	0.615 INCHES MINIMUM AND 0.627 INCHES MAXIMUM
SURFACE TREATMENT	CADMIUM AND CHROMATE OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.624 INCHES MINIMUM AND 0.703 INCHES MAXIMUM
THREAD SERIES DESIGNATOR	UNF
THREAD QUANTITY PER INCH	20

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