5306-01-239-2403, BOLT,MACHINE

National Stock Number:
5306-01-239-2403

Federal Supply Class:
5306

National Item Identification Number:
012392403

Description:
BOLT,MACHINE

Detail:
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, BOLT, SHEAR. See also SCREW, CAP, HEXAGON HEAD and SCREW, MACHINE.

Manufacturer Information:

MS9557-09

96906

MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M

Techincal Specification:

THREAD LENGTH	0.579 INCHES MINIMUM AND
	0.619 INCHES MAXIMUM
HEAD STYLE	DOUBLE HEXAGON W/HOLE
THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	28
THREAD CLASS	3A
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING	24.0 ROCKWELL C MINIMUM AND
	35.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	130000 POUNDS PER SQUARE INCH
MINIMUM YIELD STRENGTH	85000 POUNDS PER SQUARE INCH
HEAD HEIGHT	0.290 INCHES MINIMUM AND
	0.310 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.312 INCHES NOMINAL
EXTENDED WASHER DIAMETER	0.428 INCHES MINIMUM AND
	0.448 INCHES MAXIMUM
EXTENDED WASHER THICKNESS	0.060 INCHES MINIMUM
GRIP LENGTH	0.079 INCHES MINIMUM AND
	0.099 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
	32.0 MICROINCHES THREADS
FEATURES PROVIDED	FINISHED HEAD
SPEC/STD CONTROLLING DATA
MANUFACTURERS CODE	96906
DEFINITIVE GOVERNMENT SPEC/STD REFERENCE	MS9557-09
THREAD DIRECTION	RIGHT-HAND
FASTENER LENGTH	0.678 INCHES MINIMUM AND
	0.698 INCHES MAXIMUM
MATERIAL	IRON ALLOY 660 OVERALL

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