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MSD supplies steel tooth tricone bits, also called mill tooth or milled tooth bits. Compare listed sizes, API pin connections and weights before technical confirmation.
MSD Steel Tooth Tricone Bits in this parameter section correspond to the GY Series Milling Tooth Tri-Cone Rock Bits, with catalog-listed models covering bit sizes from 3 5/8" to 26". Use the specifications below to compare model, IADC code, bit size, connection / API pin, approximate weight, and the catalog-recommended drilling parameters for applicable milled tooth IADC types.
| Model | IADC Code | Bit Size (in.) | Bit Size (mm) | Connection / API Pin | Approx. Weight (kg) |
|---|---|---|---|---|---|
| 3 5/8GY126 | 26 | 3 5/8 | 92.1 | 2 3/8 REG | 5 |
| 3 3/4GY126 | 126 | 3 3/4 | 95.3 | 2 3/8 REG | 5 |
| 3 7/8GY131 | 131 | 3 7/8 | 98.4 | 2 3/8 REG | 5 |
| 4 1/2GY126 | 126 | 4 1/2 | 114.3 | 2 3/8 REG | 8 |
| 4 5/8GY126 | 126 | 4 5/8 | 117.5 | 2 3/8 REG | 8 |
| 8 1/2GY121 | 121 | 8 1/2 | 215.9 | 4 1/2 REG | 42 |
| 8 1/2GY114 | 114 | 8 1/2 | 215.9 | 4 1/2 REG | 42 |
| 8 1/2GY124 | 124 | 8 1/2 | 215.9 | 4 1/2 REG | 42 |
| 8 1/2GY124B | 124 | 8 1/2 | 215.9 | 4 1/2 REG | 42 |
| 8 1/2GY127 | 127 | 8 1/2 | 215.9 | 4 1/2 REG | 42 |
| 9 1/2GY127 | 127 | 9 1/2 | 241.3 | 6 5/8 REG | 50 |
| 9 5/8GY121 | 121 | 9 5/8 | 244.5 | 6 5/8 REG | 55 |
| 9 5/8GY124 | 124 | 9 5/8 | 244.5 | 6 5/8 REG | 55 |
| 9 5/8GY127 | 127 | 9 5/8 | 244.5 | 6 5/8 REG | 55 |
| 9 7/8GY127 | 127 | 9 7/8 | 250.8 | 6 5/8 REG | 64 |
| 12 1/4GY121 | 121 | 12 1/4 | 311.2 | 6 5/8 REG | 90 |
| 12 1/4GY124 | 124 | 12 1/4 | 311.2 | 6 5/8 REG | 90 |
| 12 1/4GY126 | 126 | 12 1/4 | 311.2 | 6 5/8 REG | 90 |
| 12 1/4GY127L | 127 | 12 1/4 | 311.2 | 6 5/8 REG | 90 |
| 13 3/4GY127 | 127 | 13 3/4 | 349.3 | 6 5/8 REG | 130 |
| 13 3/4GY127L | 127 | 13 3/4 | 349.3 | 6 5/8 REG | 130 |
| 15 GY127 | 127 | 15 | 381 | 7 5/8 REG | 180 |
| 15 GY127L | 127 | 15 | 381 | 7 5/8 REG | 180 |
| 17 1/2GY121 | 121 | 17 1/2 | 444.5 | 7 5/8 REG | 246 |
| 17 1/2GY124 | 124 | 17 1/2 | 444.5 | 7 5/8 REG | 246 |
| 17 1/2GY125 | 125 | 9 5/8 | 444.5 | 6 5/8 REG | 246 |
| 17 1/2GY127L | 127 | 17 1/2 | 444.5 | 7 5/8 REG | 246 |
| 26 P1 | 111 | 26 | 660.4 | 7 5/8 REG | 700 |
| Recommended Formation | Bit Type / IADC | Drilling Weight (kN/mm) | Rotary Speed (r/min) |
|---|---|---|---|
| Very soft: such as soft marl, clay, salt, etc. | 111 | 0.4~0.7 | 180~90 |
| Soft: such as clay, marl, soft sandstone, salt, etc. | 121 | 0.45~0.75 | 180~90 |
| Soft: such as clay, marl, soft sandstone, salt, etc. | 127 | 0.45~0.75 | 180~90 |
| Medium soft: such as shale, marl, sandstone, soft limestone, etc. | 131 | 0.5~0.75 | 120~60 |
| Very soft: such as soft marl, clay, soft sandstone, salt, etc. | 114 | 0.4~0.7 | 120~45 |
| Soft: such as clay, soft shale, marl, salt, etc. | 124 | 0.5~0.85 | 120~45 |
Note: The upper limits of drilling weight and rotary speed recommended in the table above should not be used at the same time.
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Read MoreMSD steel tooth tricone bits are the steel-tooth cutter-type products in this range. On this page, mill tooth and milled tooth are alternative names for the Steel Tooth product type.
TCI configurations use a different cutter type and are covered on the dedicated TCI Tricone Bits page. Confirm the required cutter type before comparing the listed sizes and connections.
Start with the required hole diameter, then identify the GY Milling Tooth model and IADC code in the Model Specifications table. The listed model sizes extend from 3 5/8" to 26". Confirm the exact model, bit size in inches and millimetres, Connection / API Pin, and Approx. Weight (kg) rather than selecting by diameter alone.
Review Recommended Formation against the applicable Bit Type / IADC in the separate Recommended Drilling Parameters table. Provide the formation description and available information from the existing bit or drilling record for technical review rather than selecting from diameter alone.
The model and recommended-parameter tables are not a one-to-one mapping. The recommendation table covers IADC 111, 121, 127, 131, 114, and 124; it does not provide recommended values for 125 or 126. Do not assign missing formation, drilling-weight, or rotary-speed data by borrowing from another IADC type.
Read Drilling Weight in the stated kN/mm unit and Rotary Speed in r/min, and confirm the load basis before applying rig WOB. The upper drilling-weight and rotary-speed limits must not be used simultaneously, as noted below the parameter table.
The API Pin listed for the selected steel tooth tricone bit must match the mating connection in the rotary drill string. Nominal bit size alone does not confirm connection compatibility.
For an existing system or replacement requirement, provide the mating connection, drill-pipe or sub connection information, current bit markings, and available photographs or drawings. These details allow the listed API Pin and the required drill-string arrangement to be checked together.
Steel tooth or mill tooth tricone bits on this page can be reviewed for water-well drilling requirements. The final configuration should be confirmed from the required hole diameter, formation conditions, drill rig, and mating connection rather than from the application name alone.
For technical confirmation or quotation, provide the required bit size, formation description, API Pin or mating connection, drill-rig and drill-string information, current product details where applicable, required quantity, and any additional configuration requirements.
Technical content reviewed by MSD Engineering Team. | MSD — 23+ years of rock drilling tools manufacturing expertise | ISO 9001 Certified | Exporting to 40+ countries
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