AIA/NAS 1801-2012 pdf download SCREW, HEX HEAD, CRUCIFORM RECESS, FULL THREAD, ALLOY STEEL, 1 60 KSI Ftu
MATERIAL:
ALLOY STEEL: 4140 (UNS G41400) PER AMS6382,4340 (UNS G43406) PER IL-S-5000 AMS6415 ORAMS6484,OR 8740 (UNS G87400) PER MIL-S-6049 AMS6322AMS6325 OR AMS6327
HEAT TREATMENT:
DEVELOP BASIC MATERIAL PROPERTIES AS FOLLOWS,WITH CONTROLS PER AMS2759:160 TO 180 KSI FTU.
FINISH:
CADMIUM PLATE PER AMS-QQ-P-416,TYPE IICLASS 2
CODE:
FIRST DASH NUMBER INDICATES DIAMETER PER TABLE ISECOND DASH NUMBE INDICATES LENGTH IN 0625 INCH INCREMENTSNO LETTER AFTER FIRST DASH NUMBER INDICATES UNDRILLED HEADLETTER D” AFTER FIRST DASH NUMBER INDICATES DRILLED HEAD (-3 THRU -6 SIZES ONLY).
EXAMPLES OF PART NUMBERS:
=.2500-28 UNJF-3A SCREW，ONE INCH LONGNAS1801-416NAS1801-04-12 =1120-40 UNJC-3A SCREW，750 INCH LONGNAS1801-4D16 =2500-28 UNJF-3A SCREW,ONE INCH LONG,DRILLED HEAD
NOTES:
THE CONCENTRICITY OF THE WASHER PAD TO ODOR THREAD MAJOR DIAMETER, SHALL BEWITHIN .005 INCH WHEN THE SHANK OR THREAD MAJOR DIAMETER IS GRIPPED WITHIN ADISTANCE FROM THE WASHER PAD SURFACE EQUAL TO THE THREAD MAXIMUM MAJOR DIAMETERPLUS OR MINUS TWO THREAD PITCHES.
SCREW LENGTHS OF TWO INCHES OR LESS SHALL HAVE AN UNTHREADED SHANK OF .032 TO .064ADJACENT TO THE HEAD TO SHANK FILLET RADIUS WITH A OD” SHANK AS TABULATED IN TABLESCREWS OVER TWO INCHES LONG SHALL HAVE A MINIMUM FULL THREAD FORM LENGTH OF 1.75INCHES AND AN UNTHREADED OD”SHANK SEGMENT TO WITHIN A MINIMUM DISTANCE FROM THEHEAD TO SHANK FILLET RADIUS OF .032 INCH. THE THREAD MAJOR, PICH AND MINOR DIAMETERSIN THE THREADED PORTION OF THE SCREW SHALL BE IN ACCORDANCE WITH THE AS8879.
SURFACE ROUGHNESS: HEAD TO SHANK FILLET, THREAD FLANKS AND THREAD ROOT,32MICROINCHES Ra: BEARING SURFACE OF HEAD, 63 MICROINCHES Ra: ALL OTHER SURFACES,125MICROINCHES Ra PER ASME B46.1
DIMENSIONS IN INCHES AND APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED

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