single Tube Bit

ITEM

DIAMOND BIT

REAMING SHELL

Swedish 
Metric
T2
Series

Size

Bit-set OD

Bit-set ID

mm

inch

mm

inch

mm

inch

36

36.0

1.417

22.0

0.866

36.3

1.429

46

46.0

1.811

32.0

1.260

46.3

1.823

56

56.0

2.205

42.0

1.654

56.3

2.217

66

66.0

2.598

52.0

2.047

66.3

2.610

76

76.0

2.992

62.0

2.441

76.3

3.004

86

86.0

3.386

72.0

2.835

86.3

3.398

101

101.0

3.976

84.0

3.307

101.3

3.988

Swedish
T 
Series

TAW

47.6

1.875

23.2

1.31

48.0

1.89

TBW

59.5

2.345

44.9

1.77

59.9

2.36

TNW

75.3

2.965

60.5

2.38

75.7

2.98

Application 1

Soft to medium hard rock with abrasive and fractured to competent formations  Matrix series 1-4

Application 2

Medium hard to hard rock with slightly abrasive and slightly broken to competent formations  Matrix series 5-8

Application 3

Hard to very hard rock with competent formations Matrix series 9-10

Rock Group

Formation Description

Rock Type

1-4

Soft to medium hard
Very abrasive to slightly abrasive
Very fractured to slightly broken

Unmetamorphosed or weakly metamorphosed shales,
Sandstone and limestone

5

Medium hard
Abrasive
Moderately fractured to slightly
broken

Limestone and dolomite.
Weathered granite and gneiss.
Serpentinite and metaperidotite.

6

Medium hard
Moderately abrasive
Moderately fractured to slightly
broken

Unmetamorphosed or weakly metamorphosed diorite,
Gabbro, peridotite and gneiss.
Basalt, andesite.

7

Medium hard - hard
Moderately abrasive
Slightly fractured to competent

Metabasalt, amphibolite.
Metamorphosed diorite and gabbro.
Diabase.

8

Hard
Slightly abrasive
Competent

Quartz rich skarn.
Granite and pegmatite

9

Very hard
Slightly abrasive
Very competent

Metamorphosed granitic rock and quartz rich gneiss.

10

Extremely hard
Non-abrasive, fine grained
Very competent

Chert and jasperite.
Quartzite.
Highly metamorphosed volcanic.