Tri-blade bits
The tri-blade bits distributed by PROMAFORSOVEMA are available in standard or reinforced versions, from 3" to 14"3/4. Three blades welded onto a male API Reg conical coupling, in a "Christmas tree" shape with brazed tungsten carbide inserts and a large injection passage. Reinforced versions feature 50% thicker blades and inserts for nearly double the service life. Permanently in stock at our branches.
Complete tri-blade bit range
| Diameter (inches) | Diameter (mm) | Thread |
|---|---|---|
| 3" | 76.20 | N ROD |
| 3"1/4 | 82.50 | N ROD |
| 3"1/2 | 88.90 | N ROD & 2"3/8 REG |
| 3"3/4 | 95.20 | 2"3/8 REG |
| 3"7/8 | 98.43 | 2"3/8 REG |
| 4" | 101.60 | 2"3/8 REG |
| 4"1/4 | 107.95 | 2"3/8 REG |
| 4"1/2 | 114.30 | 2"3/8 REG |
| 4"3/4 | 120.65 | 2"3/8 REG |
| 4"7/8 | 123.00 | 2"3/8 REG |
| 5" | 127.00 | 2"3/8 REG |
| 5" | 130.18 | 2"3/8 REG |
| 5"1/4 | 133.35 | 2"3/8 REG |
| 5"1/2 | 139.70 | 2"3/8 REG |
| 5"5/8 | 142.88 | 2"3/8 REG |
| 5"3/4 | 146.05 | 2"3/8 REG |
| 5"7/8 | 149.23 | 2"3/8 REG |
| 6" | 152.40 | 2"3/8 & 3"1/2 |
| 6"1/8 | 155.58 | 2"3/8 & 3"1/2 |
| 6"1/4 | 158.75 | 2"3/8 & 3"1/2 |
| 6"1/2 | 165.10 | 2"3/8 & 3"1/2 |
| 6"3/4 | 171.45 | 2"3/8 & 3"1/2 |
| 7" | 177.80 | 3"1/2 |
| 7"1/8 | 180.97 | 3"1/2 |
| 7"1/2 | 190.50 | 3"1/2 |
| 7"7/8 | 200.03 | 3"1/2 |
| 8" | 203.20 | 3"1/2 |
| 8"1/2 | 215.90 | 3"1/2 |
| 8"3/4 | 222.25 | 3"1/2 |
| 9"7/8 | 251.00 | 3"1/2 |
| 10" | 254.00 | 3"1/2 |
| 12"1/4 | 311.10 | 3"1/2 |
Other models and diameters available on request. Reamers, enlargers and guides delivered to your dimensions within a few days.
Need tri-blade bits for your project?
PROMAFORSOVEMA holds a wide stock of tri-blade bits at its 4 branches across France. Contact our technical teams for a customised quote, to check availability or for advice on selecting the tri-blade bit suited to your drilling.
