news IADC Code By Yinhai Rock Bits

FIRST DIGIT

SECOND DIGIT

THIRD DIGIT

FROM 1~8

Higher number denotes increase tooth count for harder formations

FROM 1~4

FROM 1~7

This digit classify bits according to bearing/seal type and special gauge wear protection as fellows

1

STEEL TOOTH  BITS

/MILLED TOOTH BITS

Soft formation with low compressive strength and high drilling ability

1,2,3,4 help further breakdown the underground formation with 1 being the softest and 4 the hardest

1

Open bearing/

Non-sealed bearing

Standard open bearing roller bits

2

MILLED TOOTH BITS

Medium to Medium hard formations with high compressive strength

2

Standard open bearing  bit for air drilling only,  tricone bits for mining well.

3

MILLED TOOTH BITS

Hard semi-abrasive and abrasive formations

3

Standard open bearing bit with gauge protection which is define as carbide inserts in the heel of cone.

4

TUNGSTEN CABIDE INSERTED BITS /TCI BITS

Soft formations with low compressive strength and high drilling ability

4

Sealed bearing

Roller sealed bearing

5

TCI BITS

Soft to Medium formations with low compressive strength

5

Roller sealed bearing with carbide inserts in the heel of cone.

6

TCI BITS

Medium hard formations with high compressive strength

6

Journal sealed bearing bits

7

TCI BITS

Hard semi-abrasive and abrasive formations

7

Journal sealed bearing bits with carbide inserts in the heel of the cone.

8

TCI BITS

Extremely hard and abrasive formations