Tricone Rock Bits

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Tricone Rock Bits

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Tricone Rock Bits provide outstanding performance along with outstanding reliability and simplicity. Drilling Supply Store follows the IADC bit classification system in which the first three digits classify the bit according to the bearing/seal design used and the formation it is designed to drill.


IADC code
First Digit  
1 STEEL TOOTH BITS for Soft Formation
Bits that feature long, widely spaced teeth, to drill soft formation such as shales, soft sandstone, clay and all unconsolidated formations.
IADC CODES 111 - 126 - 134
2 STEEL TOOTH BITS for Medium Formation
With medium length teeth, closer spaces, to drill unconsolidated limestones, medium sandstones, clay, marls.
IADC CODES 211 - 224 - 234
3 STEEL TOOTH BITS for Hard Formation
With short, closely spaced teeth with tungsten carbide hardfacing, for hard and abrasive formations such as sandstones, dolomite, hard limestone and granite.
IADC CODES 311 - 314 - 321
4 5 TCI BITS for Soft - Medium Soft formations
Features large chisel-shaped tungsten carbide inserts to provide the highest penetration rates in the softest formations such as shales, clays, limestone and sands.
IADC CODES 437 - 517 - 527
6 TCI BITS for Medium Hard - Hard formations
Effective in a variety of formations with higher compressive strength such as hard limestone, sandstone, dolomite and other formations with high abrasive quality, hard streaks and broken formations.
IADC CODES 617 - 627 - 637
7 8 TCI BITS for Hard and abrasive formations
With hemispherical tungsten carbide inserts. To optimize penetration rate in hard and abrasive formations such as granites, basalts, quartzite and chert. Drilling weight of 3 ± 4 tons per inch of diameter should be applied.
IADC CODES 732 - 737 - 837
Second Digit FORMATION
1 1, 2, 3 and 4 are further breakdown of formation with 1 being the softest and 4 the hardest.
1 Standard open bearing roller bit
2 Standard open bearing roller bit, air-cooled
3 Standard open bearing roller bit with gauge protection which is defined as carbide inserts in the heel of the cone
4 Sealed roller bearing bit
5 Sealed roller bearing bit with gauge protection
6 Journal sealed bearing bit
7 Journal sealed bearing bit with gauge protection
IADC code IADC code IADC code IADC code
Standard roller bearing (IADC xx1 or xx3) Roller bearing air cooled (IADC xx2 or xx3) Sealed roller bearing (IADC xx4 or XX5) Sealed friction bearing (IADC xx6 or xx7)
A Air Application
R Reinforced Welds
C Center Jet
S Standard Steel Tooth
D Deviation Control
X Chisel Insert
E Extended Jet
Y Conical Insert
G Extra Gage Protection
Z Other Insert Shape
J Jet Deflection