4720-00-445-7246 HOSE ASSEMBLY,NONMETALLIC Index 5999-00-445-7248 CONTACT ASSEMBLY,ELECTRICAL

National Stock Number:
5305-00-445-7247

Federal Supply Class:
5305

National Item Identification Number:
004457247

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:
1067453918876U S ARMY AVIATION AND MISSILE COMMAND


Techincal Specification:
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER1.230 INCHES MINIMUM AND 1.270 INCHES MAXIMUM
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER1.310 INCHES MINIMUM AND 1.320 INCHES MAXIMUM
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY3
FASTENER LENGTH1.610 INCHES MINIMUM AND 1.650 INCHES MAXIMUM
FIRST DIAMETER FROM HEAD0.182 INCHES MINIMUM AND 0.192 INCHES MAXIMUM
HEAD DIAMETER0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM
HEAD HEIGHT0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM
HEAD STYLEFLAT CHAMFER
INTERNAL DRIVE STYLESLOT
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 303 OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
SECOND DIAMETER FROM HEAD0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM
THREAD CLASS2A
THREAD DIRECTIONRIGHT-HAND
THIRD DIAMETER FROM HEAD0.179 INCHES MINIMUM AND 0.185 INCHES MAXIMUM
THREAD LENGTH0.290 INCHES MINIMUM AND 0.340 INCHES MAXIMUM
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH20


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