E J Company

Deep Hole Drilling Products

Grade Chart

Drilling Data Grade Chart (PDF 110 KB)

DRILLING  DATA  FOR  E  J  COMPANY  DTS (424.6)  &  STS (420.6)  DRILLS
ISO Material Description HB Cutting Speed
ft / min
Drill Diameter (inches)
.312-.495 .496-.614 .615-.787 .788-1.220 1.221-1.692 1.693-2.559
Feed in. / rev.
P Unalloyed Steel 90-200
125-225
150-225
180-225
230 - 395

230 - 295
 
.003-.006
 
.003-.006
 
.004-.007
 
.004-.007
 
.006-.008
 
.006-.008
 
.006-.008
 
.007-.010
 
.006-.010
 
.008-.012
 
.007-.011
 
.009-.013
 
Low Alloy Steel 150-260
220-400
230 - 330
180 - 330
.003-.006 .004-.007 .006-.008 .007-.010 .008-.012 .009-.013
High Alloy Steel 150-250
150-250
250-350
250-400
230 -330

180 - 330
 
.003-.006 .004-.007 .006-.008 .007-.010 .008-.012 .009-.013
Steel Castings 90-225
150-250
 
160 - 330 .003-.006 .003-.007 .005-.007 .006-.009 .008-.011 .010-.013
M Stainless Steel 150-270 Ferritic
150-275 Austenitic
130-280
180-280
.003-.006
.003-.006
.006-.008
.006-.008
.006-.008
.006-.008
.007-.010
.007-.010
.009-.012
.009-.012
.009-.014
.010-.014
Stainless Steel - Cast 150-180
 
150-280 .003-.006 .004-.007 .006-.008 .007-.010 .009-.012 .010-.014
Heat Resistant Alloys 180-300
220-300
220-300
30-165 .003-.005 .004-.006 .004-.007 .006-.008 .007-.010 .008-.012
  300-450
 
100-165 .003-.005 .004-.006 .005-.006 .006-.009 .007-.010 .008-.012
K Extra Hard Steel 250 100-230 .003-.006 .004-.007 .006-.008 .007-.010 .009-.012 .010-.012
Malleable Cast Iron 110-145
150-270
260-330 .003-.005 .004-.006 .006-.007 .007-.010 .008-.012 .009-.013
Grey Cast Iron 150-220
200-330
200-330 .003-.006 .003-.007 .005-.007 .006-.009 .008-.011 .009-.013
Nodular Cast Iron 125-230
200-300
165-330 .003-.006 .003-.007 .005-.007 .006-.009 .008-.011 .009-.013
Aliminum Alloys 30-80
75-150
40-100
70-125
210-430 .003-.006 .004-.008 .004-.008 .006-.010 .007-.012 .008-.018
Copper and Copper Alloys 50-160
-130
 
210-430 .003-.006 .004-.008 .004-.008 .006-.010 .007-.012 .008-.018
P ISO Drilling Data