Speed & Feed Rates

Recommended Cutting Speeds in Feet per Minute for Drilling and Reaming Ferrous Cast Metals

Material
Ferrous Cast Metals		 Hardness, HB* Material
Condition*		 Cutting Speed, fpm
Drilling Reaming
HSS HSS Carbide
Gray Cast Iron          
ASTM Class 20 120-150 A 100 65 300
ASTM Class 25 160-200 AC 90 60 225
ASTM Class 30, 35, and 40 190-220 AC 80 55 180
ASTM Class 45 and 50 220-260 AC 60 40 125
ASTM Class 55 and 60 250-320 AC, HT 30 20 80
ASTM Type 1, 1b, 5 (Ni-Resist) 100-215 AC 50 30 150
ASTM Type 2, 3, 6 (Ni-Resist) 120-175 AC 40 25 140
ASTM Type 2b, 4 (Ni-Resist) 150-250 ac 30 20 125
Malleable Iron          
Ferritic 32510, 35018 110-160 MHT 110 75 325
Pearlitic 40010, 43010, 45006,
45008, 48005, 50005		 160-200 MHT 80 55 250
200-240 MHT 70 45 180
Martensitic 53004, 60003, 60004 200-225 MHT 55 35 160
Martensitic 70002, 70003 220-260 MHT 50 30 150
Martensitic 80002 240-280 MHT 45 30 100
Martensitic 90001 250-320 MHT 25 15 80
Nodular (Ductile) Iron          
Ferritic 60-40-18, 65-45-12 140-190 A 100 65 300
Ferritic-Pearlitic 80-55-06 190-225 AC 70 45 225
225-260 AC 50 30 140
Pearlitic-Martensitic 100-70-03 240-300 HT 40 25 115
Martensitic 120-90-02 270-330 HT 25 15 65
330-400 HT 10 5 30
Cast Steels          
Low Carbon 1010,1020 100-150 AC, A, N 100 65 250
Medium Carbon 1030, 1040, 1050 125-175 AC, A, N 90 60 240
175-225 AC, A, N 70 45 220
225-300 AC, HT 55 35 200
Low Carbon Alloy
1320, 2315, 2320, 4110,
4120, 4320, 8020, 8620		 150-200 AC, A, N 75 50 220
200-250 AC, A, N 65 40 200
250-300 AC, HT 50 30 150
Medium Carbon Alloy
1330, 1340, 2325, 2330,
4125, 4130, 4140, 4330,
4340, 8030, 80B30, 8040,
8430, 8440, 8630,
8640, 9525, 9530, 9535		 175-225 AC, A, N 70 45 200
225-250 AC, A, N 60 35 180
250-300 AC, HT 45 30 150
300-350 AC, HT 30 20 140
350-400 HT 20 10 100
TCT-Reamer-Chart

Recommended material for

Hole Diameter Material Left (Diameter)
.090-.170 .005-.010
.171-.280 .008-.012
.281-.880 .010-.016
.881-2.50 .015-.030
0500-Drill

Feeds for Drilling

Feeds Diameter
.001-.003 IPR .1250 or less
.002-.006 IPR .1250-.250
.004-.010 IPR .250-.500
.007-.015 IPR .500-1.00
.010-.025 IPR 1.00 and up

Metric-to-Standard Conversion Formula (millimeters to inches)
mm 4 25.4 = inches
Example:
12.70 mm 4 25.4 = .500 inches

Calculating Revolutions Per Minute (RPM) from Surface Footage (SFPM) Diameter
12 x SFPM = RPM
p x diameter

Speeds and Feeds
.002 – .003 per flute per revolution
.0025 x number of flutes
= inches per revolution

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