AIA/NAS 1801-2008 pdf download SCREW, HEX HEAD, CRUCIFORM RECESS, FULL THREAD, ALLOY STEEL, 160 KSI Ftu
MATERIAL:
HEAT TREAT:
FINISH:
CODE:
ALLOY STEEL -4140 (UNS G41400) PER AMS6382,4340 (UNS G43406) PER MIL-8-5000 AMS6415 OR AMS6484,8740(UNS G87400) PER MIL-S-6049 AMS6322.
DEVELOP BASIC MATERIAL PROPERTIES AS FOLLOWS,WITH CONTROLS PER AMS2759160 TO 180 KSI FTU.
CADMIUM PLATE PER AMS-QQ-P-416.TYPE II,CLASS 2
FIRST DASH NUMBER INDICATES DIAMETER PER TABLE ISECOND DASH NUMBER INDICATES LENGTH IN .0625 INCH INCREMENTSNO LETTER AFTER FIRST DASH NUMBER INDICATES UNDRILLED HEAD.LETTER “D” AFTER FIRST DASH NUMBER INDICATES DRILLED HEAD (-3 THAU -6 SIZES ONLY)
EXAMPLE OF PART NUMBERS:
NAS1801-4-16 =2500-28 UNJF-3A SCREWONEINCH LONGNAS1801-04-12 =1120-40 UNJC-3A SCREW，750 INCH LONGNAS1801-4D16 -.2500-28 UNJF-3A SCREWONE INCH LONG,DRILLED HEAD.
NOTES:
THE CONCENTAICITY OF THE WASHER PAD TO OD,OR THREAD MAJOR DIAMETER, SHALL BE WITHIN .005 INCH WHENTHE SHANK OR THREAD MAO DIAMETER IS GRIPPED WITHIN A DISTANCE FROM THE WASHE PAD SURFACE EOUAL TOTHE THREAD MAXIMUM MAJOR DIAMETERPLUS OR MINUS TWO THREAD PITCHES
SCREW LENGTHS OF TWO INCHES OR LESS SHALL HAVE AN UNTHREADED SHANK OF .032 TO .064 ADJACENT TO THEHEAD TO SHANK FILLET RADIUS WITH A OD SHANK AS TABULATED IN ABLE 1. SCREWS OVER TWO INCHES LONG SHALIHAVE A MINIMUM FULL THREAD FORM LENGTH OF 1.75 INCHES AND AN UNTHREADED OD SHANK SEGMENT TO WITHIN AMINIMUM DISTANCE FAOM THE HEAD TO SHANK FILLET RADIUS OF .032 NCH. THE THREAD MAJOR, PITCH AND MINORDIAMETERS IN THE THREADED PORTION OF THE SCREW SHALL BE IN ACCORDANCE WITH THE AS8879 THREADSPECIFICATION.
SURFACE TEXTURE PER ASME B46.1: HEAD TO SHANK FILLETTHREAD FLANKS AND THREAD ROOT 32 MICROINCHES Ra’BEARING SURFACE OF HEAD 63 MICROINCHES Ra: OTHER SURFACES 125 MICROINCHES Ba
DIMENSIONS IN INCHES TO BE MET AFTER PLATING.UNLESS OTHERWISE SPECIFIEDTOLERANCES:+/-,010,ANGLES +/1
GAGING OF THE CRUCIFORM RECESS SHALL BE IN ACCORDANCE WITH NASM9006 GAGE PENETRATION FOR ACOUNTERSUNK 100 HEAD MACHINE SCREW EXCEPT AS NOTED AND SHALL BE WITHIN THE VALUES AS TABULATED INTABLE L GAGE PENETRATION FROM SURFACE “P” ON OPTIONAL HEAD PER NOTE (8).
ORIENTATION OF RECESS SLOTS TO HEX IS OPTIONAL.
DIMENSIONS AND TOLERANCING PER ANSI Y14.5M-1982
CIRCULAR INDENTATIO DEFINED BY DIMENSIONS “P” AND “OK” OPTIONAL FOR SIZES 4.6.08 AND 3 ONLYINDENTATION IS NOT ALLOWABLE FOR SIZES 4,5 AND 6.
“N MIN” TO BE MEASURED AT B MIN”HEAD CHAMFER ANGLE OPTIONAL，30 REFERENCE IF PRESENT
DRILL “M” DIA.(THREE HOLES) WITHIN .010 OF CENTER OF HEX FLA WHEN SPECIFIED BY PART NUMBER.3 THRU 6 SIZES ONLY
12.SCREWS SHALL BE FREE FROM BURRS AND SLIVERS
13THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN.
REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF INVITATIONS FOR BID.
UNLESS OTHERWISE SPECIFIED. PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THIS PART STANDARDMAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED.

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