METAL DRILLING REFERENCE GUIDE - irwin.com

1 2004 Printed in , NC for High Speed Steel DrillsSFM*Aluminum and its Alloys200-300 Brass and Bronze (Ordinary)150-300 Bronze (High Tensile)70-150 Die Castings (Zinc Base)300-400 Iron-Cast (Soft)100-150 Cast (Medium hard)70-100 Hard Chilled30-40 Malleable80-90 Magnesium and its Alloys250-400 Monel METAL or High-Nickel Steel30-50 Plastics or Similar Materials (Bakelite)100-300 Steel - Mild (.2carbon to .3carbon)80-110 Steel (.4carbon to .5carbon)70-80 Tool ( )50-60 Forgings40-50 Alloy - 300to 400 Brinell20-30 High Tensile (Heat Treated)35to 40 Rockwell C30-4040to 45 Rockwell C25-3545to 50 Rockwell C15-2550to 55 Rockwell C7-15 Stainless SteelFree Machining Grades30-80 Work Hardening Grades15-50 Wood300-400*Surface Feet per Minute (SFM)Drill DiameterRangeLightMediumHeavy1/16 to 1.

2 - . - .00401/8 to 1 - . - . - .00501/4 to 3 - . - . - .01003/8 to 1 - . - . - .01201/2 to 3 - . - . - .01403/4 to - . - . - .0200 Feed Per Drill RevolutionCutting Speeds - by Working MaterialDeep Hole DRILLING ParametersHoles that fall into the deep-hole DRILLING category are three or more drill bit diameters in depth. When you are DRILLING this deep,you must adjust your speeds and feeds accordingly. The deeper the hole is, the moreprobable that chips might lodge in the flutesand clog the drill. When the flute clogs,the amount of friction and heat will increase.

3 Heat build-up in the drill bit could cause failureand breakage. Lubricants always help the dissipation of heat from the tip of the drill bit,which prolongs the drill s life. Removing the drilland evacuating the chips after DRILLING short distances, often called step- DRILLING , will alsolessen the chance of heat build-up. Some goodrules of thumb when deep-hole DRILLING are toreduce your rate of speed and feed, remove the bit more often from the material, and use lubricant whenever you Depth to Diameter (times drill diameter)Ration SpeedReductionFeedReduction310%10%420%10 %530%20%635-40%20%Speed and Feed Reduction (Based upon hole depth)Speeds and Feeds for DeepHole DrillingIRWIN Industrial Tool CompanyCustomer ServiceTel.

4 DRILLINGREFERENCE GUIDERPM =SFM x ".01561/32". ".04690 - 80 - 64 NC, 1 - 72 NF1/16". - 56 NC, 2 - 64 ".07813 - 48 - 56 - 36 - 40 ".09384 - 48 mm - . mm - . mm - . " - 40 NS5 - 40 - 44 - 32 NC7/64". - 36 - 40 - 48 ". mm - .70, 4 mm - . - 32 NC, 8 - 36 N ".14068 - 40 " - 24 - 24 ".15623/16" - 32 - 32 mm - . mm - . ". - 24 - 28 - 32 NEF3/16". - 20 mm - mm - " - 20 NC13/64".203114 - 24 " - 24 " - 28 ".21881/4" - 32 " - 40 ".23447 mm - mm - ". " - 18 NCTap & Drill Selection ".26568 mm - " - 24 mm - mm - ".

5 28125/16" - 32 ". mm - ".31253/8" - 16 mm - mm - mm - .7521/64".32811/8" - 28 " - 24 NF1/8" - 27 mm - mm - ".343810 mm - mm - mm - ". " - 14 mm - ".375011 mm - ".39067/16" - 20 ".406212 mm - mm - mm - ".42191/2" - 13 NC12 mm - ".43751/4" - 18 ".45311/2"-20 NF,1/2" -24 NS1/4" - 19 BSP15/32".468814 mm - mm - ".48449/16" - 12 mm - ".500014 mm , 14 mm mm - ".51569/16" - 18 NF17/32".53135/8" - 11 NCEX-735/64".546916 mm - ".56253/8" - 18 NPTST-737/64".57815/8" - 18 NF16 mm - ".593811/16" - 11 NS39/64".609418 mm - ".625011/16" - 16 NS41/64".

6 640621/32".65623/4" - 10 NC18 mm - ".671911/16".68753/4" - 16 NF20 mm - ".70311/2" - 14 NPT23/32".718847/64".73443/4".750049/64" .76567/8" - 9 NC25/32".781251/64".796913/16".81257/8" - 14 NF22 mm - ".828124 mm - ".843855/64".85947/8".87501" - 8 NC24 mm - ".890629/32".906259/64".92191" - 12 NF3/4" - 14 NPT15/16".93751" - 14 NS61/64".953131/32".968863/64".98441-1/8 " - 7 NC1" " " " " " " " - 11-1/2 NPT1-3/16" " " " " " " - 11-1/2 NPTNC = National Coarse (USS)NS = National SpecialNF = National Fine (SAE)NEF = National Extra FineNPT = National Pipe TaperBSP = British Standard ".01561/32".

7 ".04690 - 80 - 64 NC, 1 - 72 NF1/16". - 56 NC, 2 - 64 ".07813 - 48 - 56 - 36 - 40 ".09384 - 48 mm - . mm - . mm - . " - 40 NS5 - 40 - 44 - 32 NC7/64". - 36 - 40 - 48 ". mm - .70, 4 mm - . - 32 NC, 8 - 36 N ".14068 - 40 " - 24 - 24 ".15623/16" - 32 - 32 mm - . mm - . ". - 24 - 28 - 32 NEF3/16". - 20 mm - mm - " - 20 NC13/64".203114 - 24 " - 24 " - 28 ".21881/4" - 32 " - 40 ".23447 mm - mm - ". " - 18 NCTap & Drill Selection ".26568 mm - " - 24 mm - mm - ".28125/16" - 32 ". mm - ".31253/8" - 16 mm - mm - mm.

8 7521/64".32811/8" - 28 " - 24 NF1/8" - 27 mm - mm - ".343810 mm - mm - mm - ". " - 14 mm - ".375011 mm - ".39067/16" - 20 ".406212 mm - mm - mm - ".42191/2" - 13 NC12 mm - ".43751/4" - 18 ".45311/2"-20 NF,1/2" -24 NS1/4" - 19 BSP15/32".468814 mm - mm - ".48449/16" - 12 mm - ".500014 mm , 14 mm mm - ".51569/16" - 18 NF17/32".53135/8" - 11 NCEX-735/64".546916 mm - ".56253/8" - 18 NPTST-737/64".57815/8" - 18 NF16 mm - ".593811/16" - 11 NS39/64".609418 mm - ".625011/16" - 16 NS41/64".640621/32".65623/4" - 10 NC18 mm - ".671911/16".

9 68753/4" - 16 NF20 mm - ".70311/2" - 14 NPT23/32".718847/64".73443/4".750049/64" .76567/8" - 9 NC25/32".781251/64".796913/16".81257/8" - 14 NF22 mm - ".828124 mm - ".843855/64".85947/8".87501" - 8 NC24 mm - ".890629/32".906259/64".92191" - 12 NF3/4" - 14 NPT15/16".93751" - 14 NS61/64".953131/32".968863/64".98441-1/8 " - 7 NC1" " " " " " " " - 11-1/2 NPT1-3/16" " " " " " " - 11-1/2 NPTNC = National Coarse (USS)NS = National SpecialNF = National Fine (SAE)NEF = National Extra FineNPT = National Pipe TaperBSP = British Standard Pipe 2004 Printed in , NC for High Speed Steel DrillsSFM*Aluminum and its Alloys200-300 Brass and Bronze (Ordinary)150-300 Bronze (High Tensile)70-150 Die Castings (Zinc Base)300-400 Iron-Cast (Soft)100-150 Cast (Medium hard)

10 70-100 Hard Chilled30-40 Malleable80-90 Magnesium and its Alloys250-400 Monel METAL or High-Nickel Steel30-50 Plastics or Similar Materials (Bakelite)100-300 Steel - Mild (.2carbon to .3carbon)80-110 Steel (.4carbon to .5carbon)70-80 Tool ( )50-60 Forgings40-50 Alloy - 300to 400 Brinell20-30 High Tensile (Heat Treated)35to 40 Rockwell C30-4040to 45 Rockwell C25-3545to 50 Rockwell C15-2550to 55 Rockwell C7-15 Stainless SteelFree Machining Grades30-80 Work Hardening Grades15-50 Wood300-400*Surface Feet per Minute (SFM)Drill DiameterRangeLightMediumHeavy1/16 to 1 - . - . - .00401/8 to 1.