For Drifting & Tunnelling bits (R25, R28, R32, NR34, R35)

Type

Type 06

Type 03

Type 23

Type 09

Type 08

Cross

Face confi guration

Rock hardness

Hard

Medium-hard

Soft

Character

High speed drilling

Wear resistance

Straightness

Wear resistant bit 
for medium-hard to 
hard rock forma-
tions.

High speed drilling 
bit for medium-
hard to hard rock 
formations.

Wear resistant bit 
for soft to medium-
hard rock forma-
tions.

High speed drill-
ing bit for soft to 
medium-hard rock 
formations.

High speed drilling 
bit for soft rock 
formations. 
* Advantage for 
face buttons 
regrinding. 

Straigntest drilling 
bit. 
*Low speed drill-
ing. 

Flushing hole variety

V : Face fl ushing hole 

W : Face and side fl ushing hole

Normal fl ushing hole design.

Effective in case of plugged face 
fl ushing hole.

Skirt variety

S : Straight skirt

R : Retrac skirt (R32 thread bit

Ø

51 or larger)

Normal bit skirt design.

Retrac wings help to guide the bit in and 
out of the hole.
Effective in straignt hole drilling.

Carbide shape variety

R : Round 

BB : Semi ballistic

B : Ballistic

SA : Spike

Utility carbide shape.

Strong confi gura-

tion against carbide 

fracture.

Combined wear 

resistance and high 

penetration rate.

Recommended for 

medium-hard rock with 

moderate abrasitivity.

Higher penetrating 

carbide shape than 

Semi ballistic shape.

Recommended for 

soft rock.

Highest penetrating 

carbide shape.

*Weak confi guration 

against carbide fracture.

Recommended for soft 

to medium-hard rock.

Carbide feature

Penetration rate

Anti fracture

Wear

resistance

High speed

drilling

50

100

150

200

250

Soft rock

Medium-hard rock

Hard rock

Extremely hard rock

Type 09

Type 23

Type 03

Type 06

14  

PRODUCT GUIDE

Selection guide

Compressive strength (Mpa)

Round

Semi-ballistic

Spike

Ballistic