5306-01-321-1704, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-01-321-1704

Federal Supply Class:
5306

National Item Identification Number:
013211704

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:

BACB30NF8D19

81205

THE BOEING COMPANY

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	1.542 INCHES NOMINAL FIRST HOLE
EXTENDED WASHER DIAMETER	0.734 INCHES MINIMUM AND 0.752 INCHES MAXIMUM
EXTENDED WASHER THICKNESS	0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM
FASTENER LENGTH	1.713 INCHES MINIMUM AND 1.743 INCHES MAXIMUM
GRIP DIAMETER	0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM
GRIP LENGTH	1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM
HEAD HEIGHT	0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM
HEAD STYLE	HEXAGON EXTENDED WASHER
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OR AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 4340 OR STEEL COMP 8740 OVERALL
NOMINAL THREAD DIAMETER	0.5000 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE
SPECIAL FEATURES	TOP OF HEAD IS DISHED,0.49/0.51 IN. DIA
WIDTH BETWEEN FLATS	0.746 INCHES NOMINAL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.541 INCHES NOMINAL
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH	20

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