Part Number: 401 185

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CONDITION:
NS
PIPER AIRCRAFT INC.77294
E.C.A ETABLISSEMENT CENTRAL DESAPPROVISIONNEMENTS DES FORCES ARMEEA00AM
U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM19207
AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE88044
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.531 INCHES MINIMUM
FASTENER LENGTH0.719 INCHES NOMINAL
HEAD STYLEHEXAGON
HEAD HEIGHT0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM
WIDTH BETWEEN FLATS0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM
NOMINAL THREAD DIAMETER0.312 INCHES
GRIP LENGTH0.188 INCHES NOMINAL
FEATURES PROVIDEDFINISHED HEAD
THREAD QUANTITY PER INCH24
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH
HARDNESS RATING26.0 ROCKWELL C MINIMUM OVERALL AND 32.0 ROCKWELL C MAXIMUM OVERALL
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,TY2,CL3 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.