5305-01-273-6843, SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-01-273-6843

Federal Supply Class:
5305

National Item Identification Number:
012736843

Description:
SCREW,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 undercut for thread relief). It is No. 0 (0.060 IN.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below No. 10 (0.190 IN.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and multiple spline types) but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. See also BOLT, EXTERNALLY RELIEVED BODY and BOLT, INTERNAL WRENCHING.

Manufacturer Information:

7222331-00

90536

LOCKHEED MARTIN CORP

Techincal Specification:

DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.070 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER	0.550 INCHES NOMINAL
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	2
FASTENER LENGTH	0.840 INCHES NOMINAL
FIRST DIAMETER FROM HEAD	0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM
HEAD DIAMETER	0.262 INCHES MINIMUM AND 0.270 INCHES MAXIMUM
HEAD HEIGHT	0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM
HEAD STYLE	FLAT CHAMFER
INTERNAL DRIVE STYLE	HEXAGON
MATERIAL	STEEL CORROSION RESISTING OVERALL
NOMINAL THREAD DIAMETER	0.164 INCHES
POINT DIAMETER	0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM
POINT LENGTH	0.080 INCHES NOMINAL
POINT STYLE	BALL
SECOND DIAMETER FROM HEAD	0.105 INCHES MINIMUM AND 0.115 INCHES MAXIMUM
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.210 INCHES NOMINAL
THREAD QUANTITY PER INCH	32
THREAD SERIES DESIGNATOR	UNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS	0.140 INCHES MINIMUM AND 0.142 INCHES MAXIMUM

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