Part Number: NAS428KH4-14

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CONDITION:
NS
NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE80205
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH1.438 INCHES MINIMUM AND 1.469 INCHES MAXIMUM
FASTENER LENGTH1.500 INCHES NOMINAL
HEAD STYLECROWNED HEXAGON
HEAD HEIGHT0.141 INCHES NOMINAL
WIDTH BETWEEN FLATS0.438 INCHES NOMINAL
HOLE DIAMETER0.046 INCHES NOMINAL
NOMINAL THREAD DIAMETER0.250 INCHES
GRIP LENGTH0.031 INCHES MINIMUM AND 0.062 INCHES MAXIMUM
HOLE QUANTITY1
HOLE TYPEDRILLED
FEATURES PROVIDEDFINISHED HEAD
THREAD QUANTITY PER INCH28
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH
HARDNESS RATING26.0 ROCKWELL C MINIMUM OVERALL AND 32.0 ROCKWELL C MAXIMUM OVERALL
HOLE CONFIGURATION STYLEHEXAGON FLATS
SPECIAL FEATURESSUPPLIED W/SLOT IN END OF SHANK
MATERIALSTEEL COMP 4037 OVERALL OR STEEL COMP 4130 OVERALL OR STEEL COMP 8630 OVERALL OR STEEL COMP 8735 OVERALL OR STEEL COMP 8740 OVERALL OR STEEL COMP 4140 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-6812 MIL SPEC ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENTCADMIUM OVERALL AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD SERIES DESIGNATORUNF
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 .19 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 . 15 inch ( . 38 mm) or less, BOLT, SHEAR. See also SCREW, CAP, HEXAGON HEAD and SCREW, MACHINE.