AIA/NAS 937-2006 pdf download DRILLS, DOUBLE MARGIN STEPPED, HIGH SPEED STEEL AND COBALT, 1/8 INCH THRU 1/2 INCH
PRIME APPLICATION IS FOR DRILLING CLOSE TOLERANCE HOLES INALUMINUM ALLOYS.SEE MATERIAL GROUP 11 NAS 907 SHEET 20.
M-2 OR M-7 H.S.S.
Rc 63.0 TO Rc 66.0 FOR 75% OF FLUTE LENGTH,FROM POINT ENDSHANK HARDNESS ON AIRCRAFT EXTENSION DRILLS TO BE RC 45 TO RC66 TO WITHIN 1-1/2 INCH OF END，SHANK HARDNESS SHALL BE AMINIMUM OF RC 18 ONE INCH FROM THE DRILL SHANK END.
Rc 63.0 TO RC 66.0 FOR 75% OF FLUTE LENGTH FROM POINT END.SHANKHARDNESS SHALL BE RC-18 MINIMUM ONE INCH FROM THE END OF THEDRILL SHANK.
BRIGHT FINISH STANDARD.OTHER CUSTOMER SPECIFIED FINISHOPTIONAL.TOOLS TO HAVE ADEQUATE PROTECTION FROMCORROSION.
P-3(135°) STANDARD.SEE NAS 907 SHEET 11.STEP ANGLEREQUIREMENTS ARE FOUND ON SHEET 7 IN THIS SPECIFICATION
MANUFACTURER’S SYMBOL AND SIZE MARKING TO BE PERMANENT ANDLEGIBLE ON THE TOOL.LOT NUMBER IDENTIFICATION OR DATE CODE TOBE PUT ON TOOL SHANK OR PACKAGING.
WEB THICKNESS SHALL INCREASE IN A UNIFORM TAPER OF 0.017 0.003INCH PER INCHFROM “W1” AT POINTTO END OF FULL DEPTH OF
FLUTES.
JOBBER LENGTH STANDARD.OPTIONAL 6INCH AND 12 NCH AIRCRAFTEXTENSION LENGTHS.
BACK TAPER TO BE .0002 TO .0005 INCH PER INCH FOR ALL DIAMETERS
DRILL DIAMETER TOLERANCE TO BE +.0000 -.0005 INCHMEASURED ATTHE DRILL DIAMETER AT THE STEP ANGLE
FLUTE AND RELIEF GRIND AREA WILL HAVE A SURFACE FINISH OF 16 RAOR BETTER.THIS IS A VISUAL COMPARATIVE CHECK ONLY.NODISCOLORATIONIS ALLOWED AT CUTTING EDGES.
SEE NAS 907 SHEETS 16 18 FOR TYPEB” DRILL CONSTRUCTION (DRILL SIZES, FLUTELENGTHS.WEB THICKNESS W1)AND HELIX ANGLE
SEE NAS 907 SHEETS 14 – 15 FOR PTIONAL SHANK CONFIGURATIONS.SEE NAS 907 SHEET 11 FOR P-3 POINT SPECIFICATIONS

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