For Bench & Long hole drilling bits (T38, T45, T51, ST58, ST68)

Type

Type 15 & Type 25

Type 23

Type 53 & 55

Type 83 & 85

Face confi guration

Rock hardness

Hard

Medium-hard

Soft

Character

High speed drilling

Wear resistance

Straightness

Wear resisitant bit for medium-
hard to hard rock formations.
Type 25 is recommended for large 
sized bits.

High speed 
drilling bit for 
medium-hard 
rock formations.

Wear resistant bit for soft to 
medium-hard rock formations.
Recommended to eliminate hole 
deviation.

High speed drilling bit for soft rock 
formations.

Type

Type 14

Cross

Face confi guration

Rock hardness

Hard

Medium-hard

Soft

Character

High speed drilling

Wear resistance

Straightness

Dedicated to low 
power drifter.

Straightest drill-
ing bit.
*Low speed 
drilling.

Carbide shape variety

R : Round 

BB : Semi ballistic

B : Ballistic

SA : Spike

Utility carbide shape.

Strong confi guration 

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

Round

Semi-ballistic

Spike

Ballistic

Flushing hole variety

V : Face fl ushing hole 

W : Face and side fl ushing hole

Normal fl ushing hole design.

Offers optimized fl ushing against 
plugging.

Skirt variety

S : Straight skirt

R : Retrac skirt 

Normal bit skirt design.

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

Wear

resistance

High speed

drilling

50

100

150

200

250

Soft rock

Medium-hard rock

Hard rock

Extremely hard rock

Type 83 & 85

Type 53 & 55

Type 23

Type 15 & 25

16  

PRODUCT GUIDE

Compressive strength (Mpa)

Selection guide