AIA/NAS 5311-2011 pdf download SCREW, FLAT FILLISTER HEAD, FULL THREAD, NAS1800 SIX LOBE RECESS
MATERIAL: CRES − A286 (UNS S66286) CONFORMING TO THE CHEMISTRY OF AMS5731, AMS5732, AMS5737 OR AMS5853.
TITANIUM ALLOY − 6AL-4V (UNS R56400) PER AMS4928 OR AMS4967.
HEAT TREATMENT:
DEVELOP BASIC MATERIAL PROPERTIES AS FOLLOWS, WITH CONTROLS PER AMS-H-6875 OR AMS2759 FOR CRES AND AMS-H-81200 OR AMS2801 FOR TITANIUM.
CRES − 160-190 KSI F TU . PRECIPITATION HARDENING PER AMS5853 OR AMS2759. /12/
TITANIUM (6AL-4V) − 160 KSI F TU MIN
FINISH: CRES − PASSIVATE IN ACCORDANCE WITH AMS2700, METHOD 1, CLASS 4 OR CADMIUM PLATE PER AMS-QQ-P-416, TYPE II, CLASS 2.
CODE: BASIC PART NUMBER = NAS1800 SIX LOBE RECESS FLAT FILLISTER HEAD SHEAR SCREW.
MATERIAL CODE AFTER BASIC NUMBER:
ADD “E” FOR CRES.
ADD “V” FOR TITANIUM.
DIAMETER DASH NUMBER DESIGNATES DIAMETER AND THREAD.
FINISH CODE AFTER DIAMETER DASH NUMBER:
ADD “-” FOR PASSIVATION (CRES ONLY).
ADD “-” FOR BARE TITANIUM
ADD “A” FOR ALUMINUM PIGMENTED COATING (TITANIUM ONLY).
ADD “P” FOR CADMIUM PLATING (CRES ONLY).
LENGTH DASH NUMBER DESIGNATES NOMINAL LENGTH IN .0625 LENGTHS AS TABULATED.
INTERMEDIATE OR LONGER LENGTHS MAY BE SPECIFIED BY USE OF WHOLE DASH NUMBERS ONLY.
USE 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:
NAS5311E3-10 = SCREW, .1900-32 THREAD, PASSIVATED CRES, .625 LENGTH
NAS5311V5A15 = SCREW, .3125-24 THREAD, ALUMINUM PIGMENTED COATED TITANIUM, .938 LENGTH.
NAS5311V5-15 = SCREW, .3125-24 THREAD, TITANIUM ALLOY, .938 LENGTH.
NAS5311E3P10 = SCREW, .1900-32 THREAD, CADMIUM PLATED CRES, .625 LENGTH.
NAS5311V06A19H = SCREW, .1380-32 THREAD, ALUMINUM PIGMENTED COATED TITANIUM, 1.188 LENGTH, DRILLED HEAD.
NOTES:
/1/ DIAMETER OF UNTHREADED PORTION OF SCREWS (INCLUDING THE THREAD TRANSITION AREA) SHALL NOT BE LESS THAN MINIMUM PITCH DIAMETER NOR MORE THAN MAXIMUM MAJOR DIAMETER OF THREAD.
/2/ FOR SCREWS 2 INCHES LONG OR SHORTER, COMPLETE THREADS (INCLUDING THE THREAD TRANSITION AREA) SHALL EXTEND TO WITHIN 2 THREADS OF THE BEARING SURFACE OF THE HEAD.SCREWS OF LONGER LENGTH SHALL HAVE A MINIMUM COMPLETE THREAD LENGTH OF 1.750 INCHES.
/3/ RECESS GAGING IN ACCORDANCE WITH NAS1800.
(4) REMOVE ALL BURRS AND SHARP EDGES.
/5/ SCREW RECESSES SHALL MEET THE TORQUE TEST REQUIREMENTS SPECIFIED HEREIN WHEN TESTED IN ACCORDANCE 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 BASED ON FED-STD-H28.
(8) DIMENSIONS ARE IN INCHES AND APPLY AFTER FINISH UNLESS OTHERWISE SPECIFIED.
(9) SURFACE ROUGHNESS: “ØD”, UNDERSIDE OF HEAD AND FLANKS AND ROOT OF THREADS:32 MICROINCHES Ra; ALL OTHER SURFACES: 125 MICROINCHES Ra PER ASME B46.1.
/10/ THREADS IN ACCORDANCE WITH AS8879.

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