2540-01-518-4555 ARMOR,SUPPLEMENTAL,SMALL ARMS-FR Index 5305-01-518-4557 SCREW,CAP,HEXAGON HEAD

National Stock Number:
5305-01-518-4556

Federal Supply Class:
5305

National Item Identification Number:
015184556

Description:
SCREW,CAP,HEXAGON HEAD

Detail:
An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. The threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. The thread length being the controlled dimension, the grip length is not specified. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, MACHINE; BOLT, EXTERNALLY RELIEVED BODY; BOLT, INTERNAL WRENCHING; and SCREW, CAP, SOCKET HEAD.


Manufacturer Information:
B1821BH038F275D80204AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED
MS18153-6796906MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M


Techincal Specification:
FASTENER LENGTH2.750 INCHES NOMINAL
HEAD HEIGHT0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM
HEAD STYLEHEXAGON
HOLE CONFIGURATION STYLEHEXAGON FLATS
HOLE DIAMETER0.062 INCHES NOMINAL
HOLE QUANTITY1
HOLE TYPEDRILLED
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A354,GR BD(GR 8) ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTZINC AND CHROMATE OVERALL
THREAD CLASS2A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH1.000 INCHES NOMINAL
THREAD SERIES DESIGNATORUNF
THREAD QUANTITY PER INCH24


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