5306-99-852-5571, BOLT,EXTERNALLY RELIEVED BODY

National Stock Number:
5306-99-852-5571

Federal Supply Class:
5306

National Item Identification Number:
998525571

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:

B515661

K0378

ROLLS-ROYCE PLC

Techincal Specification:

DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	2.28 MILLIMETERS NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	1.27 MILLIMETERS MINIMUM AND 1.77 MILLIMETERS MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FOURTH DIAMETER	20.30 MILLIMETERS MINIMUM AND 21.10 MILLIMETERS MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	7.87 MILLIMETERS MINIMUM AND 8.64 MILLIMETERS MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER	13.75 MILLIMETERS MINIMUM AND 14.25 MILLIMETERS MAXIMUM
CRITICALITY CODE JUSTIFICATION	AAWC AND AAWE
FASTENER LENGTH	28.95 MILLIMETERS MINIMUM AND 29.45 MILLIMETERS MAXIMUM AND 29.20 MILLIMETERS NOMINAL
FIRST DIAMETER FROM HEAD	6.261 MILLIMETERS MINIMUM AND 6.337 MILLIMETERS MAXIMUM
FOURTH DIAMETER FROM HEAD	4.83 MILLIMETERS MINIMUM AND 4.95 MILLIMETERS MAXIMUM
HARDNESS RATING	360.0 VICKERS OR FIRTH DIAMOND PYRAMID MINIMUM OVERALL AND 480.0 VICKERS OR FIRTH DIAMOND PYRAMID MAXIMUM OVERALL
HEAD DIAMETER	12.75 MILLIMETERS MINIMUM AND 13.25 MILLIMETERS MAXIMUM
HEAD HEIGHT	3.55 MILLIMETERS MINIMUM AND 4.05 MILLIMETERS MAXIMUM
HEAD STYLE	DEE CHAMFER
MATERIAL DOCUMENT AND CLASSIFICATION	DTD 5638 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL	NICKEL ALLOY OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES
SECOND DIAMETER FROM HEAD	4.83 MILLIMETERS MINIMUM AND 4.95 MILLIMETERS MAXIMUM
SHANK UNTHREADED HOLE DIAMETER	1.70 MILLIMETERS MINIMUM AND 1.88 MILLIMETERS MAXIMUM
THIRD DIAMETER FROM HEAD	6.261 MILLIMETERS MINIMUM AND 6.337 MILLIMETERS MAXIMUM
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	8.50 MILLIMETERS NOMINAL
THREAD QUANTITY PER INCH	28
THREAD SERIES DESIGNATOR	UNJF
DISTANCE FROM CENTERLINE TO FLAT	4.75 MILLIMETERS MINIMUM AND 4.88 MILLIMETERS MAXIMUM

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