Tel:
0086-190-3126-6699
Email:
jessica@sanlongdrillbit.cn
Sanlong steel tooth tricone bits — also known as milled-tooth (MT) tricone bits — deliver aggressive, high-speed rock shearing in soft-to-medium formations including clay, shale, mudstone, soft limestone, and sandstone. The cutting teeth are milled directly from the cone body and fully hard-faced with wear-resistant material from crest to root, combining maximum initial penetration rates with extended tooth life.
Available with open bearing or sealed bearing configurations, in sizes from 3.5" to 26", and across IADC codes 115 through 337. All bits are API 7-1 and ISO certified. Custom tooth geometry, bearing type, and thread connection available on request.
| IADC code | Formation | Weight (kN/mm) | Rotary Speed (r/min) |
| 115 | Extremely soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, etc. | 0.25-0.70 | 200-80 |
| 127 | Soft formations with low compressive strength and high drillability, such as shale, clay, salt rock, soft limestone, etc. | 0.35-1.00 | 150-70 |
| 217 | Medium hardness with high compressive strength and hard interlayers, such as hard shale, sandstone, limestone, etc. | 0.5-1.20 | 100-50 |
| 337 | Highly abrasive hard formations, such as hard limestone, dolomite, hard sandstone, chert, etc. | 0.8-1.40 | 75-45 |
| Inch: Sanlong offers you standard sizes and custom sizes ranging from 3.5 to 26 inch. | |||
1. Tooth Design & Hardfacing
Wedge-profile milled teeth, hard-faced from crest to root. Each tooth is precision-milled from the cone body blank to a balanced wedge profile that promotes both aggressive rock shearing and structural tooth strength. This is the same hardfacing approach used by leading global manufacturers and is critical for preventing premature tooth rounding in abrasive intervals.
2. High Penetration Rate in Soft Formations
When formation conditions are suitable, steel tooth bits consistently outperform TCI bits on rate of penetration (ROP). The widely spaced, long tooth profile creates a low-resistance cutting action that chips and shears soft rock efficiently — minimizing the energy required per unit depth drilled and maximizing footage per hour.
Steel tooth tricone bits from Sanlong are used across these drilling programs:
Oil & Gas Exploration & Production — Soft-to-medium formation intervals in vertical, directional, and horizontal wells; ideal for surface and intermediate sections in favorable geology
Water Well Drilling — High-ROP, cost-effective penetration in clay, loose sand, gravel, and unconsolidated formations; open bearing configurations well suited to clean fluid programs
Geothermal Drilling — Soft volcanic or sedimentary intervals where speed is prioritized and formation temperatures do not exceed bearing limits
Coal Field & Mineral Exploration — Rotary drilling in soft-to-medium sedimentary sequences
HDD (Horizontal Directional Drilling) — Pilot bore and back-reaming in favorable soft-ground conditions
Geological Exploration — Shallow boreholes where formation type is known and cost efficiency is prioritized
Best suited for formations with UCS up to approximately 80 MPa. For harder, more abrasive intervals (UCS 80–200+ MPa), consider Sanlong's TCI tricone bit.
| Steel Tooth Bit | TCI Bit | |
| Formation hardness | Soft to medium (IADC 1–3) | Medium to hard (IADC 4–8) |
| Penetration rate | Faster in soft formations | More consistent across hard formations |
| Tooth material | Milled steel + hardfacing | Tungsten carbide inserts |
| Bit cost | Lower | Higher |
| Bearing life | Good (sealed for deeper wells) | Good |
| Best for | Water well, soft oil & gas sections, HDD | Hard rock, abrasive formations, deep wells |
Read the full comparison: Milled-Tooth vs. TCI Tricone Bits
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