VKP Down-The-Hole hammer is designed for drilling deep holes in low to high strength materials, particularly for blasting operations in quarries. Maximum depth of a borehole is determined by the potential of the drilling rig and, critically, the ability to flush out bore dust which changes with the material drilled, diameter of the hole, operating air pressure and drill bit used. The hammer can drill in saturated borehole environments as well as completely underwater. With foam or water flushing, the hammer may also be used in enclosed areas like underground mines
| Weight | Air consumption 0,6 MPa | Air consumption 1,2 MPa | Air consumption 1,8 MPa | Impact frequency 0,6MPa |
|---|---|---|---|---|
| 25 kg | 3,1 m3min-1 | 6,2 m3min-1 | 10 m3min-1 | 21 Hz |
| Impact frequency 1,2MPa | Impact frequency 1,8MPa | Oper. air pressure | Hammer Outside Diameter | Length |
|---|---|---|---|---|
| 27 Hz | 31 Hz | 0,5 - 1,8 MPa | 87 mm | 810 mm |
| Backhead Spanner Flat Size | Drill Bit Shank Type | Bore Hole Diameter | Piston Weight | Wear Sleeve Discard Limit |
|---|---|---|---|---|
| 65 mm | MD 3,5 | 100 - 105 mm | 5.3 kg | 84 |
| Connecting thread (inner) | Ordering code |
|---|---|
| 2 3/8” A.P.I Reg box | 9550-370 |
| 01 | 4342-590 | Cylinder |
| 02 | 2361-190 | Retaining ring |
| 03 | 273 109 | O-Ring |
| 04 | 2148-350 | Bit chuck |
| 05* | 5009-190* | Piston* |
| 06 | 3093-190 | Piston guide |
| 07 | 273 072 | O-Ring |
| 09* | 5097-140* | Threaded backhead* |
| 10 | 2023-350 | Valve bushing |
| 11 | 4325-190 | Valve tube |
| 12 | 315 037 | Spring |
| 13 | 2007-130 | Ring |
| 14* | 0901-760* | Valve dart* |
| 15 | 2007-150 | Spacing Tube |
| 16 | 273 408 | Rubber ring |
| 17 | 5100-070 | Threaded backhead assy. |
| 18 | 5009-210 | Piston assembly |
| 19 | 8140-010 | Valve dart assembly |
| - | * | Only sold as part of assembly |
