5306-01-320-8840, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-01-320-8840

Federal Supply Class:
5306

National Item Identification Number:
013208840

Description:
BOLT,CLOSE TOLERANCE

Detail:
A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. The head is designed to accommodate an external wrench or driver. 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. The unthreaded portion is of specific 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. A locking feature may be incorporated in the design of the head or threads. See BOLT, MACHINE and BOLT, CLEVIS.

Manufacturer Information:

NAS6605D34

80205

NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJF
NOMINAL THREAD DIAMETER	0.312 INCHES
THREAD QUANTITY PER INCH	24
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.444 INCHES MINIMUM AND
	0.494 INCHES MAXIMUM
FASTENER LENGTH	2.579 INCHES MINIMUM AND
	2.609 INCHES MAXIMUM
MATERIAL	STEEL COMP E4340 OR
	STEEL COMP 8740 OR
	STEEL COMP 4037 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS6349 ASSN STD 1ST MATERIAL RESPONSE OR
	AMS6382 ASSN STD 1ST MATERIAL RESPONSE OR
	AMS6415 ASSN STD 2ND MATERIAL RESPONSE OR
	AMS6484 ASSN STD 2ND MATERIAL RESPONSE OR
	AMS6325 ASSN STD 3RD MATERIAL RESPONSE OR
	AMS6327 ASSN STD 3RD MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND
	CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND
	40.0 ROCKWELL C MAXIMUM OVERALL
HEAD STYLE	DISHED HEXAGON
HEAD HEIGHT	0.141 INCHES MINIMUM AND
	0.171 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.492 INCHES MINIMUM AND
	0.502 INCHES MAXIMUM
HOLE TYPE	DRILLED
HOLE QUANTITY	1
HOLE DIAMETER	0.070 INCHES MINIMUM AND
	0.080 INCHES MAXIMUM
GRIP LENGTH	2.115 INCHES MINIMUM AND
	2.135 INCHES MAXIMUM
GRIP DIAMETER	0.3110 INCHES MINIMUM AND
	0.3120 INCHES MAXIMUM
SURFACE FINISH	32.0 MICROINCHES BEARING SURFACE OF HEAD
	32.0 MICROINCHES GRIP
	32.0 MICROINCHES THREADS
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	2.398 INCHES MINIMUM AND
	2.428 INCHES MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND
	0.086 INCHES MAXIMUM FIRST HOLE
SPECIFICATION/STANDARD DATA	80205-NAS6605 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD

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