These rods have friction welded tool joints which are
specially hardened and made of the highest quality steel.
The advantage of friction welding is that different steel qualities can be
chosen for the mid-body section and the tool joints. A high quality alloy
steel is used for the tool joints, increasing the strength in the threads
where it is required, combined with a thin-wall tubular material in
between, making the rods light and easier to handle.
When required an additional surface hardening can be applied to the tool
joints for increased wear resistance.
The rods have spanner flats on the pin and box ends. Plastic thread
protectors are available for all API connection types.
The rods are suitable for both DTH hammer and rotary drilling.
| Friction-welded Drill Rods | |||
| Rod Type | Rod
O.D. in. (mm) |
Thread | |
| LPR-67 | 2.5/8" | 66.7 | NWY |
| LPR-76 | 3" | 76.2 | 2.3/8" API Reg |
| LPR-89 | 3.1/2" | 88.9 | 2.3/8" API Reg |
| 2.3/8" API I.F. | |||
| 2.7/8" API Reg | |||
| LPR-102 | 4" | 101.6 | 2.3/8" API I.F. |
| LPR-114 | 4.1/2" | 114.3 | 2.3/8" API I.F. |
| 2.7/8" API Reg | |||
| LPR-127 | 5" | 127.0 | 3.1/2" API I.F. |
| LPR-140 | 5.1/2" | 139.7 | 4.1/2" API Reg |
| Standard effective lengths are 3000 and 1500 mm. Other lengths manufactured to order. | |||
