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National Stock Number: 5305-01-042-8198
Federal Supply Class: 5305
National Item Identification Number: 010428198
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.
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Manufacturer Information:
SC-B-691406 | 80063 | US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR |
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Techincal Specification:
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER | 1.125 INCHES NOMINAL | EXTERNALLY RELIEVED BODY DIAMETER QUANTITY | 1 | FASTENER LENGTH | 1.750 INCHES NOMINAL | FIRST DIAMETER FROM HEAD | 0.185 INCHES NOMINAL | HEAD HEIGHT | 0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM | HEAD DIAMETER | 0.492 INCHES NOMINAL | HEAD STYLE | PAN | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | MATERIAL | STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 303CU OR STEEL COMP 303MA OR STEEL COMP 304 OR STEEL COMP 304L OVERALL | NOMINAL THREAD DIAMETER | 0.250 INCHES | POINT STYLE | FLAT | THREAD DIRECTION | RIGHT-HAND | THREAD CLASS | 2A | THREAD LENGTH | 0.625 INCHES NOMINAL | THREAD SERIES DESIGNATOR | UNC | THREAD QUANTITY PER INCH | 20 |
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