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Tee Jay International follows the IADC bit classification system in which
the first three digits classify the bit according to the formation it is
designed to drill and the bearing/seal design used. IADC Coding
In designing sealed bearing bits, all major manufacturers follow the IADC bit classification system in which the first three digits classify the bit according to the formation it is designed to drill and the bearing/seal system used.
First Digit
1, 2, and 3 designate steel tooth bits, with 1 for soft, 2 for medium, and 3 for hard formations.
4,5,6,7, and 8 designate tungsten carbide insert bits for varying formation hardness, with 4 the softest and 8 the hardest.
Second Digit
1, 2, 3, and 4 are a further breakdown of formation hardness with 1 the softest and 4 the hardest.
Third Digit
This digit will be a 1 through 7, classifying the bit according to bearing/seal type and special gauge wear protection as follows:
- Standard open bearing roller bit.
- Standard open bearing roller bit for air drilling only.
- Standard open bearing roller bit with gauge protection which is defined as carbide inserts in the heel of the cone.
- Roller sealed bearing bit.
- Roller sealed bearing bit with carbide inserts in the heel of the cone.
- Journal sealed bearing bit.
- Journal sealed bearing bit with carbide inserts in the heel of the cone.
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