5306-99-547-6488, BOLT,EXTERNALLY RELIEVED BODY

5999-99-547-6490 CHASSIS,ELECTRICAL EQUIPMENT

National Stock Number:
5306-99-547-6488

Federal Supply Class:
5306

National Item Identification Number:
995476488

Description:
BOLT,EXTERNALLY RELIEVED BODY

Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercuts for thread relief). It is No. 10 (0.190 IN.) (5 mm) or larger in size and has a head which is not designed to be held or driven with an inserted driver or designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, INTERNAL WRENCHING and THUMBSCREW. See also SCREW, EXTERNALLY RELIEVED BODY.

Manufacturer Information:

AS24534	K7766	BRITISH STANDARDS INSTITUTION
AS24534	U1653	SOCIETY OF BRITISH AEROSPACE COMPANI LTD SBAC

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	3.05 MILLIMETERS MINIMUM AND 3.81 MILLIMETERS MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	33.40 MILLIMETERS MINIMUM AND 34.90 MILLIMETERS MAXIMUM
EXTENDED WASHER THICKNESS	1.27 MILLIMETERS MINIMUM AND 1.77 MILLIMETERS MAXIMUM
EXTENDED WASHER DIAMETER	10.88 MILLIMETERS MINIMUM AND 11.38 MILLIMETERS MAXIMUM
FASTENER LENGTH	53.75 MILLIMETERS MINIMUM AND 54.25 MILLIMETERS MAXIMUM
FIRST DIAMETER FROM HEAD	6.25 MILLIMETERS MINIMUM AND 6.32 MILLIMETERS MAXIMUM
HARDNESS RATING	248.0 BRINELL STANDARD MINIMUM OVERALL AND 341.0 BRINELL STANDARD MAXIMUM OVERALL
HEAD HEIGHT	7.45 MILLIMETERS MINIMUM AND 7.95 MILLIMETERS MAXIMUM
HEAD STYLE	DOUBLE HEXAGON W/HOLE
MATERIAL	STEEL OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SECOND DIAMETER FROM HEAD	4.83 MILLIMETERS MINIMUM AND 4.96 MILLIMETERS MAXIMUM
WIDTH BETWEEN FLATS	7.69 MILLIMETERS MINIMUM AND 8.19 MILLIMETERS MAXIMUM
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	19.85 MILLIMETERS NOMINAL
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNF

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