5306-00-151-1781, BOLT,CLOSE TOLERANCE

National Stock Number:
5306-00-151-1781

Federal Supply Class:
5306

National Item Identification Number:
001511781

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:

AN178H46

88044

AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	4.671 INCHES NOMINAL FIRST HOLE
FASTENER LENGTH	4.844 INCHES NOMINAL
GRIP DIAMETER	0.4986 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM
GRIP LENGTH	4.062 INCHES NOMINAL
HARDNESS RATING	26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
HEAD HEIGHT	0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM
HEAD STYLE	HEXAGON
HOLE CONFIGURATION STYLE	HEXAGON FLATS
HOLE DIAMETER	0.070 INCHES NOMINAL
HOLE QUANTITY	1
HOLE TYPE	DRILLED
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 3RD MATERIAL RESPONSE OR AMS 6300 ASSN STD 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 6TH MATERIAL RESPONSE OVERALL
MATERIAL	STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4037 OR STEEL COMP 4130 OR STEEL COMP 4140 OVERALL
MINIMUM TENSILE STRENGTH	125000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER	0.500 INCHES
SHANK UNTHREADED HOLE DIAMETER	0.106 INCHES NOMINAL FIRST HOLE
WIDTH BETWEEN FLATS	0.740 INCHES MINIMUM AND 0.752 INCHES MAXIMUM
SURFACE FINISH	125.0 MICROINCHES THREADS
SURFACE FINISH	250.0 MICROINCHES TOP OF HEAD
SURFACE FINISH	63.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH	63.0 MICROINCHES GRIP
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM OVERALL
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.782 INCHES MINIMUM
THREAD QUANTITY PER INCH	20
THREAD SERIES DESIGNATOR	UNF

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