TWIST DRILLS
Straight Shank Twist Drills
Twist Drills
with Reduced Shank
Twist Drills
Titanium Coated
Twist Drills Plus Series
Twist Drills for Aluminium
Twist Drills Morse Cone
Twist Drills Stub Series
Twist Drills Double Ended
Twist Drills Long Series
Twist Drills 8% Co
 
Strike Twist Drills

Strike brand has always characterised high quality twist drills, offered in a range that gets increasingly more complete.
All our twist drills are milled and ground from the solid, and undergo a severe quality control in order to guarantee that they are always up to our customers' expectations.

HSS twist drills are made with AISI M2 steel, and are available in many versions: Straight Shank (art. 57), Reduced Shank (art. 57R), Straight Shank Long Series (art. 59L), Straight Shank Stub Series (art. 59E), Morse Cone (art. 59C), Straight Shank Double Ended (art. 59D). Furthermore, twist drills that undergo special treatments are available:

TIN (art. 57T): a Titanium Nitride coating improves hardness and smoothness, making it easier to drill steels.

PLUS (art. 58): a special HD (Hard Coated) coating process increases the hardness of the twist drills (64-65 HRC) and improves the smoothness..

Twist drills with a special sharpening to drill Aluminium (art. 59A) are also available.

CO Twist Drills (art.88) are made with high speed 8% Cobalt AISI M42 steel. This kind of cobalt steel guarantees excellent performances even when drilling the most resistant steels.
TWIST DRILLS' DIAMETERS AND RELATIVE LENGTHS
 DIN 338
 ø 0,5  1 1,5  2  2,5 3  3,5  4  4,5  5  6 7 8 9 10 11 12 13 14 16 18 20 
 L 22 34  40  49  57  61  70  75  80  86  93  109  117  125  133 142 151 151 160 178 196 214
 E 6  12  18  24  30  33  39  43  47  52  57  69  75  81  87  94 101 101 108 120 130 140
 DIN 340
 ø 1,5 2 2,5  3 3,5 4 4,5  5 6 7 8 9 10 11 12 13
 L 70 85  95  100 112 119 126 132 139 156 165 175 184 195 205 205
 E 45 56 62 66 73 78 82 87 91 102 109 115 121 128 134 134
 DIN 345
 ø 8 10 12 14 16 18 20 22 24 26 28 30 32 35 38 40 42 45 50
 L 156 168 182 189 218 228 238 248 281 286 291 296 334 339 349 349 354 359 369
 E 75 87 101 108 120 130 140 150 160 165 170 175 185 190 200 200 205 210 220
 DIN 1897
 ø 2 2,5 3 3,5 4 4,5 5 6 7 8
 L 38 43 46 52 55  58 62 66 74 79
 E 12 14 16 20 22 24 26 28 34 37

TWIST DRILLS CUTTING SPECIFICATIONS
 MATERIAL R
(N/mmq)		 REFRIGERANT SPEED
(m/min)		 TWIST DRILL DIAMETER (mm)
2 5 8 10 12  16 20
FEET (mm/r.)
MAX r.p.m.
 Construction
 steel		 >500 Emulsion 25-30 0,05
5000		 0,10
2000		 0,16
1200		 0,18
1000		 0,20
800		 0,25
550		 0,40
500
 Low alloy steel 500/900 Emulsion 15-25 0,05
4000		 0,10
1600		 0,16
1000		 0,18
800		 0,20
650		 0,25
500		 0,40
400
 Alloy steel* 900/1100 Emuls/Oil 8-15 0,02
2400		 0,05
950		 0,08
600		 0,10
500		 0,12
400		 0,14
300		 0,18
250
 High alloy and
 stainless steel*		 1100/1400 Emuls/Oil 6-12 0,02
1900		 0,05
750		 0,08
500		 0,10
400		 0,12
300		 0,14
250		 0,18
200
 Mild cast iron HB<240 Dry 15-25 0,02
4000		 0,12
1600		 0,20
1000		 0,23
800		 0,25
650		 0,30
500		 0,35
400
 Hard cast iron HB>240 Dry 5-15 0,03
2400		 0,07
1000		 0,10
600		 0,14
500		 0,16
400		 0,20
300		 0,25
250
 Copper 200/400 Emuls/Oil 20-30 0,05
4800		 0,14
1900		 0,18
1200		 0,20
950		 0,22
800		 0,30
600		 0,35
500
 Brass 250/650 Emuls/Oil 30-60 0,05
9500		 0,15
3800		 0,20
2400		 0,23
1900		 0,25
1600		 0,35
1200		 0,40
950
 Bronze 300/800 Emuls/Oil 20-40 0,05
6400		 0,08
2500		 0,14
1600		 0,16
1300		 0,20
1100		 0,25
800		 0,28
650
 Zinc alloys Emulsion 30-40 0,05
6400		 0,14
2500		 0,18
1600		 0,20
1300		 0,22
1100		 0,25
800		 0,28
650
 Nickel alloys* 500/1200 Oil 2-6 0,02
1000		 0,05
400		 0,08
250		 0,10
200		 0,12
150		 0,14
100		 0,16
100
 Titanium alloys* 700/1250 Oil 3-6 0,02
1000		 0,05
400		 0,08
250		 0,10
200		 0,12
150		 0,14
100		 0,16
100
 (*) HSS CO Twist Drill recommended