Genuine Aircraft Hardware Co.All original Text, Tables, andDrawings are Copyright 1994-2006reproduction by permission only.

Documents in this book for REFERENCE ONLY, not intended for design. Not guaranteed for accuracy.

1 0 0 % m a d e i n t h e U n i t e d S t a t e s o f A m e r i c a .

Use the charts on the left tohelp in selection of the drillsyou require.

The High-Speed drill bits areall made to NAS907 type B.They have a 135 degreesplit point and a blacksurface treated finish. ThePrecision Twist Drill seriesnumbers are:

Fractional R10BAlphabetical R15BNumerical R18BThey all have standard flutelengths.

The Cobalt Numerical andFractional drill bits are madeto NAS907 type D. TheAlphabetical drill bits aremade to NAS907 type J.They all have a 135 degreesplit point and a bronzecolored oxide finish. ThePrecision Twist Drill seriesnumbers are:

Fractional R88CONumerical R89CO

The above two have screwmachine length (short) flutesfor greater rigidity. Thebelow series has standardflute lengths.

Alphabetical R15CO

Jobberlength

251

High Speed Steel and Cobalt Drill Bits

Genuine Aircraft Hardware Co. All original Text, Tables, andDrawings are Copyright 1994-2006reproduction by permission only.

252 Documents in this book for REFERENCE ONLY, not intended for design. Not guaranteed for accuracy.

High Speed Steel and Cobalt Drill BitsThreaded Shank Drill Bits NAS965B, NAS965D & Other Sizes

Part Numbers for Threaded Drill BitsNAS965 ( B ) or ( D ) - ( dia. ) - ( L )

B =Hex Shank, HSS Drill 135 deg. Spilt Point.D =Square Shank, Cobalt Drill, 135deg, Split Point.

dia =See charts for available Diameters listed.L =is the length code, see below ST,SH,LG,&, EL.ST = Stubby, between 1/2” & 5/8” depending on diameter.SH =Short, between 1” & 1+1/4” depending on diameter.LG =Long, all long drills are 2+1/8” regardless of diameter.EL =Extra Long, limited sizes avail., all are 3” see charts

Example or Part Number.NAS965B-#10-SH = Threaded, High SpeedSteel , Dr i l l B i t , Hex Shank, .1935 d iameter,1+1/4” length, 135 degree sp l i t po in t .NOTE:Diameters Greater than .2570 are not listed on the NAS965Spec. Substitute “NAS965” with “THD135” SEE CHART

253Documents in this book for REFERENCE ONLY, not intended for design. Not guaranteed for accuracy.

Genuine Aircraft Hardware Co.All original Text, Tables, andDrawings are Copyright 1994-2006reproduction by permission only.

Extension Drills and Jobber Length Drill Sets

The long drill bitsare made toNAS907 B(High-Speed)NAS907 J(Cobalt).

They have a 135degree split point.The Hi-Speedhave a black surface treated finish.

The Cobalt have a bronze oxide finish.

Jobber Length Drill SetsAll the sets that we stock are Hi-Speed steel with a

black surface treated finish and a 118 degree conventional point for general purpose drilling.

Part # 99976 Part # 99977Wire Sizes 1 - 60 Fractional Sizes 1/16 - 1/2 by 1/64ths

60 pieces in metal index 29 pieces in metal index

Part # 99981 Part # 99983Wire Sizes 61 - 80 Letter Sizes A - Z

20 pieces in metal index 26 pieces in metal index