HSS Twist Drill Recommended Speeds and Point Angles
(Scroll down for recommended feed rates by diameter)

Steels Point Angle SFM
Steel < 180 HB 118 80-110
Steel 180-280 HB 118 45-70
Steel 280-380 HB 135-140 30-45
Steel >380 HB 135-140 15-25
 
Stainless Steels Point Angle SFM
Stainless steel 200-300 series 135-140 20-40
Stainless steel 400 series and PH 118 30-60
 
Cast Iron Point Angle SFM
Gray cast iron < 180 HB 90 100-150
Gray cast iron 180-200 HB 118 70-100
Gray cast iron - > 200 HB 118 50-70
Ductile/Nodular cast iron 118 70-80
Cast Iron - chilled 135-140 25-35
 
High-temp alloys Point Angle SFM
Inconel 600 series 135-140 15-30
Inconel X 135-140 10-15
Hastelloy 135-140 15-30
Titanium and titanium alloys 135-140 20-30
A-286 135-140 15-25
Monel 118 40-50
 
Non-ferrous Point Angle SFM
Aluminum and aluminum alloys 118 200-300
Brass 111 150-250
Bronze 118 100-200
Copper 118 100-200

 

HSS Twist Drill Recommended Feed Rates by Diameter

Diameter Feed - IPR
1/4" to 5/16 " .006" to.010"
3/8" to 7/16" .008" to.012"
1/2" to 9/16" .010" to.014"
5/8" to 11/16" .012" to.016"
3/4" to 13/16" .013" to.018"
7/8" to 1 1/8" .015" to .025"
1 1/4" to 1 1/2" .020" to .040"
Over 1 1/2" .025" and up