AIA/NAS 5311-2006 pdf download SCREW, FLAT FILLISTER HEAD, FULL THREAD, NAS1800 SIX LOBE RECESS
MATERIAL:
HEAT TREAT:
CRES – A286 (UNS S66286) CONFORMING TO THE CHEMISTRY OF AMS 5731AMS 5732， AMS 5737OR AMS 5853.
TITANIUM ALLOY – 6AL-4V (UNS R56400) PER AMS 4928 OR AMS 4967.DEVELOP BASIC MATERIAL PROPERTIES AS FOLLOWS, WITH CONTROLS PER AMS-H-6875 OR AMS2759 FOR CRES AND AMS-H-81200 OR AMS 2801 FOR TITANIUM.
CRES – 160 – 190 KSI FTU. PRECIPITATION HARDENING PER AMS 5853 OR AMS 2759.(12)TITANIUM – 160 KSI FTU MIN PER AMS-H-81200 OR AMS 2801.
FINISH:
CRES – PASSIVATE IN ACCORDANCE WITH AMS 2700, METHOD 1 TYPE 2 OR TYPE 8,CLASS1OR CADMIUM PLATE PER AMS-QQ-P-416，TYPE IICLASS 2 POST PLATE HYDROGENEMBRITTLEMENT BAKING AND TESTING PER AMS-QQ-P-416 ARE NOT REQUIRED.
TIANIUM ALLOY – NONE OR OPTIONAL ALUMINUM PIGMENTED COATING PER NAS4006 WITHCETYL ALCOHOL LUBRICANT PER MIL-L-87132TYPE IIGRADE B
CODE:
BASIC PART NUMBER = NAS1800 SIX LOBE RECESS FLAT FILLISTER HEAD SHEAR SCREW.MATERIAL CODE AFTER BASIC NUMBERADD“E”FOR CRES.ADD”V”FOR TITANIUMDIAMETER DASH NUMBER DESIGNATES DIAMETER AND THREAD.FINISH CODE AFTER DIAMETER DASH NUMBER:ADD””FOR PASSIVATION (CRES ONLY).ADD“”FOR BARE TITANIUMADD“A”FOR ALUMINUM PIGMENTED COATING (TITANIUM ONLY).ADD“P”FOR CADMIUM PLATING (CRES ONLY).LENGTH DASH NUMBER DESIGNATES NOMINAL LENGTH IN .0625 LENGTHS AS TABULATEDINTERMEDIATE OR LONGER LENGTHS MAY BE SPECIFIED BY USE OF WHOLE DASH NUMBERSONLYUSE OF .25 INCH INCREMENTS IS RECOMMENDED FOR SCREWS OVER 3 INCHES LONG.TYPE CODE AFTER LENGTH DASH NUMBER INDICATES DRILL OPTION.
ADD“H”FOR DRILLED HEAD.
NO CODE FOR UNDRILLED HEAD.
EXAMPLES OF PART NUMBERS:
SCREW，.1900-32 THREAD，PASSIVATED CRES，625 LENGTH1
SCREW，.3125-24 THREAD，ALUMINUM PIGMENTED COATED TITANIUM，.9381LENGTH.SCREW，.3125-24 THREAD，TITANIUM ALLOY，.38 LENGTH
SCREW，.1900-32 THREAD，CADMIUM PLATED CRES，625 LENGTH
SCREW，.1380-32 THREAD，ALUMINUM PIGMENTED COATED TITANIUMNAS5311V06A19H1.188 LENGTH，DRILLED HEAD
NOTES:
(1) DIAMETER OF UNTHREADED ORTION OF SCREWS (INCLUDING THE THREAD TRANSITION AREA) SHALL NOTBE LESS THAN MINIMUM PITCH DIAMETER NOR MORE THAN MAXIMUM MAJOR DIAMETER OF THREAD
(2) FOR SCREWS 2 INCHES LONG OR SHORTERCOMPLETE THREADS (INCLUDING THE THREAD TRANSITIONAREA) SHALL EXTEND TO WITHIN 2 THREADS OF THE BEARING SURFACE OF THE HEAD.SCREWS OFLONGER LENGTH SHALL HAVE A MINIMUM COMPLETE THREAD LENGTH OF 1.750 INCHES
(3) RECESS GAGING IN ACCORDANCE WITH NAS1800.
(4) SCREWS SHALL BE FREE FROM BURRS AND SHARP EDGES.
(5) SCREW RECESSES SHALL MEET THE TOROUE TEST REQUIREMENTS SPECIFIED HEREIN WHEN TESTED INACCORDANCE WITH THE APPLICABLE PROCUREMENT SPECIFICATION.
(6) BEARING SURFACE SQUARENESS: WITHIN .003 FIM OF SHANK DIA.
(7) TENSILE STRESS AREAS USED FOR CALCULATION OF ULTIMATE TENSILE STRENGTH VALUES ARE BASEDON FED-STD-H28

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