Step Drill Bits with Spiral Flute Application:
For drilling and roughening of sheet material, pipes and profils and deburring of bot sides in one step. ROK drills bit are CBN(cubical boron nitride) highly ground, without burrs.
Features:
Split point: Redues walking which is the tendency of a spinning bit to rotate away from the point at wichi you want to drill
CNB fully ground flute provides quiet running and high cutting performance.
Hole is Laser marking on the tools
Made by high-performance HSS, high wear resistance and long life span.
Material sheet:
| China |
European |
American |
Japanese |
HRC |
| HSS6542 |
HSS |
M2 |
SKH-51 |
63-65 |
| HSS Co5 |
HSS-E |
M35 |
SKH-55 |
64-66 |
Note: HSS Co5 is a development of HSS6542 and contains 5%cobalt which gives improved hardness, ware resistance and red hardness.
Specifications:
|
Order No.
|
Size
|
Steps
|
Shank Size
|
|
STDR-10001
|
4 - 12mm
|
5 step
|
6mm/6.5mm
|
|
|
4 - 12mm
|
9 step
|
6mm/6.5mm
|
|
|
4 - 20mm
|
9 step
|
8mm
|
|
|
4 - 22mm
|
10 step
|
8mm
|
|
|
4 - 30mm
|
14 step
|
10mm
|
|
|
4 - 39mm
|
14 step
|
10mm
|
|
|
5 - 35mm
|
13 step
|
13mm
|
|
|
6 - 18mm
|
7 step
|
10mm
|
|
|
6 - 20mm
|
8 step
|
10mm
|
|
|
6 - 24mm
|
10 step
|
10mm
|
|
|
6 - 32mm
|
8 step
|
10mm
|
|
|
14 - 24mm
|
6 step
|
13mm
|
|
|
14 - 25mm
|
7 step
|
13mm
|
|
|
20 - 34mm
|
8 step
|
13mm
|
|
|
10 - 20mm
|
11 step
|
10mm
|
|
|
20 - 30mm
|
11 step
|
13mm
|
|
|
5 - 28.3mm
|
10 step
|
10mm
|
|
|
6 - 30mm
|
13 step
|
10mm
|
|
|
6 - 38mm
|
12 step
|
10mm
|
|
|
6 - 26.75mm
|
7 step
|
10mm
|
|
|
6 - 39mm
|
12 step
|
10mm
|
|
|
6 - 37mm
|
12 step
|
10mm
|
|
|
6 - 32mm
|
9 step
|
10mm
|
|
|
6 - 40mm
|
16 step
|
13mm
|
|
|
4 - 32mm
|
15 step
|
10mm
|
|
| |
|
Order No.
|
Size
|
Steps
|
Shank Size
|
|
STDR-11001
|
3/16" - 1/2"
|
6 step
|
1/4"
|
|
|
1/8" - 1/2"
|
13 step
|
1/4"
|
|
|
1/4" - 3/4"
|
9 step
|
3/8"
|
|
|
3/16" - 7/8"
|
12 step
|
3/8"
|
|
|
7/16" - 1 1/8"
|
12 step
|
3/8"
|
|
|
1/4" - 1 1/2"
|
11 step
|
1/2"
|
|
|
1/2" - 1"
|
9 step
|
3/8"
|
|
|
9/16" - 1"
|
8 step
|
3/8"
|
|
|
3/4" - 1 3/8"
|
11 step
|
1/2"
|
|
|
13/16" - 1 3/8"
|
10 step
|
1/2"
|
|
Additional surface hardening:
Tin: For hard materials
Extended Service lives
Higher cutting speed
Higher tool life
Temperature resistance up to 600 degree.
Sureace treatment ca.2.500HV
Layer thickness up to 0.002mm
Reduces cold weldings
TiAIN: For particularly hard materials.
Outstanding service lives
Highest cutting speeds
Optimized tool life
Surface treatment Ca. 3.500HV
Layer Thickness up to 0.004mm
Reduces cold weldings
Temperature resistance up to 800 degree
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