5305-01-206-8399, SCREW,EXTERNALLY RELIEVED BODY

5305-01-206-8398 SCREW,EXTERNALLY RELIEVED BODY

5305-01-206-8400 SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-01-206-8399

Federal Supply Class:
5305

National Item Identification Number:
012068399

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:

768228-1	73030	HAMILTON SUNDSTRAND CORPORATION
768228-2	73030	HAMILTON SUNDSTRAND CORPORATION

Techincal Specification:

THREAD SERIES DESIGNATOR	UNJC
NOMINAL THREAD DIAMETER	0.138 INCHES
THREAD QUANTITY PER INCH	32
THREAD CLASS	3A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.330 INCHES NOMINAL
FASTENER LENGTH	0.747 INCHES MINIMUM AND
	0.750 INCHES MAXIMUM
MATERIAL	STEEL COMP 4340 OR
	STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR
	MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR
	AMS6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL
SURFACE TREATMENT	CADMIUM AND
	CHROMATE HEAD
	CADMIUM AND
	CHROMATE BEARING SURFACE OF HEAD
	CADMIUM GRIP
	CHROMATE FASTENER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE HEAD
	QQ-P-416,TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD
	HS74 TYPE 2 CLASS 3 MFR REF SINGLE TREATMENT RESPONSE GRIP
	QQ-P-416,TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE FASTENER
HARDNESS RATING	36.0 ROCKWELL C MINIMUM AND
	40.0 ROCKWELL C MAXIMUM OVERALL
MINIMUM TENSILE STRENGTH	160000 POUNDS PER SQUARE INCH
HEAD STYLE	HEXAGON
HEAD HEIGHT	0.080 INCHES MINIMUM AND
	0.093 INCHES MAXIMUM
WIDTH BETWEEN FLATS	0.243 INCHES MINIMUM AND
	0.251 INCHES MAXIMUM
INTERNAL DRIVE STYLE	TRI-WING RECESS
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	1
FIRST DIAMETER FROM HEAD	0.096 INCHES MINIMUM AND
	0.100 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.420 INCHES NOMINAL

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