3020-01-457-4137 GEAR ASSEMBLY,WORM Index 5998-01-457-4139 CIRCUIT CARD ASSEMBLY

National Stock Number:
5306-01-457-4138

Federal Supply Class:
5306

National Item Identification Number:
014574138

Description:
BOLT,MACHINE

Detail:
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. The threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. Head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. For items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, BOLT, SHEAR. See also SCREW, CAP, HEXAGON HEAD and SCREW, MACHINE.


Manufacturer Information:
NAS428-6A-2480205NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE


Techincal Specification:
FASTENER LENGTH2.500 INCHES MINIMUM AND 2.562 INCHES MAXIMUM
GRIP LENGTH0.031 INCHES MINIMUM AND 0.062 INCHES MAXIMUM
HEAD HEIGHT0.203 INCHES NOMINAL
HEAD STYLECROWNED HEXAGON
PART NAME ASSIGNED BY CONTROLLING AGENCYBOLT,MACHINE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-6812 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER0.375 INCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE II,CLASS2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH2.438 INCHES MINIMUM AND 2.469 INCHES MAXIMUM
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH24
WIDTH BETWEEN FLATS0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM


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