Development drill rigs
DD421
- Coverage
- 60 m²
- Hole length
- 3.44 - 4.66 m
- Tramming type and distance
- Hydrodynamic transmission - Diesel engine - MB OM904LA (110 kW, Tier 3, Stage IIIA)

Sandvik DD421 is a two-boom, electro-hydraulic mining development drill offering highly accurate drilling and efficient control, due to adjustable drilling settings that optimize drilling performance.
Features
-
Agile carrier
DD421 features an agile frame-steered carrier that facilitates easy tramming in small tunnels.
-
Hydraulic controls
The hydraulic control system allows for fast, accurate drilling during drifting and tunneling of 8 - 60 square meter cross sections.
-
Robust and proven components
The compact drilling module allows for multi-directional drilling in low-heading tunnels. This, in combination with a range of well-designed robust components, increases equipment reliability and drilling efficiency.
Product specifications
- Coverage
- 60 m²
- Hole length
- 3.44 - 4.66 m
- Tramming type and distance
- Hydrodynamic transmission - Diesel engine - MB OM904LA (110 kW, Tier 3, Stage IIIA)
- Hole diameter
- 43 - 64 mm
- Number of booms
- 2 x SB60
- Drift size (H x W)
- 4.5 x 4.5 m
- Feed length
- Fixed TF500 12 to 16 ft or telescopic TFX 6-12 ft. to 10-16 ft.
- Rock drill
- RD525 25kW
- Voltage
- 380 - 690 V (multi voltage)
- Controls type
- THC561, hydraulic controls
- Weight
- 24,500 kg (depending on options)

Learn more about DD421 features
FOPS/ROPS-approved cabin
Enhance the comfort and safety of operators with a FOPS/ROPS-approved (ISO 3449) cabin. Features include air-conditioning and safety-laminated windows.
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