Back to Somta UD Ultra Parabolic Twist Drills

UD Ultra Parabolic Twist Drill Selection Guide
Material Types Hardness
HB		 Tensile Strength
N/mm2		 Normal Chip Form Drill Type & Surface Treatment Surface Speed
Metres per min		 Feed Curve
Steel  Free cutting steels <120 <400 extra long UDL
TiN 		35-45
50-70 		H
J
 Structural steel
 Case carburizing steel 		<200 <700 middle/long UDL
TiN 		25-35
40-50 		H
J
 Plain Carbon steel <250 <850 long UDL
TiN TiAIN 		25-30
35-40 		G
I
 Alloy steel >250 <850 long UDL
TiN TiAIN 		25-30
35-40 		G
I
 Alloy steel. Hardened and
 Tempered steel 		>250<350 >850
<1200 		long UDL
TiN TiAIN 		15-20
25-30 		E
G
 Alloy steel. Hardened and
 Tempered steel 		>350 >1200 long UDL
TiN TiAIN 		15-20
20-25 		E
G
Stainless Steel  Free machining stainless
 Steel 		<250 <850 middle UDL
TiN TiAIN 		18-21
27-32 		E
G
 Austenitic <250 <850 long UDL
TiN TiAIN 		8-10
12-15 		K
M
 Ferritic + Austenitic, Ferritic,
 Martensitic 		<300 <1000 long UDL
TiN TiAIN 		10-15
16-22 		E
G
Titanium  Titanium, unalloyed <200 <700 extra long UDL
TiAIN 		20-25
30-35 		E
G
 Titanium, alloyed <270 <900 middle/short UDS
TiAIN 		13-17
20-25 		E
G
 Titanium, alloyed >270<350 >900<1200 middle/short UDS
TiAIN 		5-6
7-11 		C
E
Nickel  Nickel, unalloyed <150 <500 extra long UDL
TiAIN 		12-16
20-25 		G
I
 Nickel, alloyed <270 <900 long UDL
TiAIN 		6-8
10-12 		G
I
 Nickel, alloyed >270<350 >900<1200 long UDL
TiAIN 		5-6
10-12 		C
E
Copper  Copper <100 <350 extra long UDL
TiN 		55-65
80-95 		L
N
 Beta Brass, Bronze <200 <700 middle/short UDS
TiN 		60-70
90-105 		L
N
 Alpha Brass <200 <700 long UDL
TiN 		30-40
45-50 		L
N
 High strength Bronze <470 <1500 short UDS
TiN 		27-33
40-50 		K
M
Aluminium Magnesium  Al, Mg, unalloyed <100 <350 extra long UDL
TiN 		75-85
110-125 		N
N
 Al alloyed Si < 0.5% <150 <500 middle UDL
TiN 		65-75
100-115 		N
N
 Al alloyed, Si >0.5%
                    <10% 		<120 <400 middle/short UDS
TiN 		55-65
80-100 		L
N
 Al alloyed, Si >10%
 Al-alloys, Mg-alloys 		<120 <400 short UDS
TiN 		27-33
40-50 		K
M
Synthetic Materials  Thermoplastics - - extra long UDL
TiN 		75-85
110-125 		L
N
 Thermosetting plastics - - short UDS
TiN 		55-65
80-100 		J
L