5305-01-330-0429, SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-01-330-0429

Federal Supply Class:
5305

National Item Identification Number:
013300429

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:

803-5959304-X-42

53711

NAVAL SEA SYSTEMS COMMAND

Techincal Specification:

THREAD SERIES DESIGNATOR	UNC
NOMINAL THREAD DIAMETER	0.250 INCHES
THREAD QUANTITY PER INCH	20
THREAD CLASS	2A
THREAD DIRECTION	RIGHT-HAND
THREAD LENGTH	0.350 INCHES NOMINAL
FASTENER LENGTH	0.500 INCHES NOMINAL
MATERIAL	NICKEL ALLOY K-500 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	QQ-N-286 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
HEAD STYLE	FLAT CHAMFER
HEAD DIAMETER	0.380 INCHES NOMINAL
HEAD HEIGHT	0.500 INCHES NOMINAL
INTERNAL DRIVE STYLE	HEXAGON
WIDTH ACROSS FLATS	0.188 INCHES MINIMUM AND
	0.190 INCHES MAXIMUM
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER	0.340 INCHES NOMINAL FIRST HOLE
SHANK UNTHREADED HOLE DIAMETER	0.120 INCHES NOMINAL FIRST HOLE
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY	1
FIRST DIAMETER FROM HEAD	0.170 INCHES NOMINAL
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER	0.150 INCHES NOMINAL

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