DT821 Tunneling jumbo

Sandvik DT821 Tunneling Jumbo for underground mining

Sandvik DT821 is a two-boom, electro-hydraulic jumbo designed for fast and accurate drilling in tunneling and cavern excavation. It is a powerful drill rig with added automatic functions and optional instrumentation to maximize productivity and ensure high-quality excavation. It drills holes with a diameter of 43 to 64 millimeters (1 ¾ to 2 ½ inches) with a depth of up to 6.2 meters (20 feet).

Sandvik DT821 jumbos can be equipped with hydraulic or electronic drilling systems, with added automatic functions and comprehensive choices for instrumentation level, ensuring you get the machine perfectly suited to your task. It is available in both cabin and safety canopy versions. Sandvik DT821 jumbos can be used for face drilling, cross-cutting and bolt hole drilling.


  • RD5 series rock drills deliver superior performance with high consumable life
  • Universal booms with large optimum shaped coverage and full automatic parallelism
  • Optional utility boom for bolting and utility works
  • Powerful four-wheel-drive center articulated carrier ensures rapid tramming and good balance
Technical data
Tunnel size 8,420 - 14,210 mm (331.5 - 559.5 in.)
Coverage area 12 - 110 m² (129 - 1,184 ft²)
Hole diameter 43 - 64 mm (1 ¾ - 2 ½ in.)
Hole length Up to 6,180 mm
Rock drill RD520, 20 kW (27 hp) DT821, DT821-C
RD525, 25 kW (33.5 hp) DT821-SC
Control system Hydraulic THC 561 (DT821, DT821-C)
Electronic TPC 561 (DT821-SC)
Boom 2 x SB90
Elevating boom support NO
Feed TF500, 16 ft
Length 14,930 mm (49 ft) with default feed
Width (DT821) 3,000 mm (10 ft) drilling
3,000 mm (10 ft) tramming
2,500 mm (8 ft) transportation
Height (DT821) 3,600 mm (11.8 ft) drilling
2,750 mm (9 ft) tramming
Weight (DT821, depending on options) 26,500 kg (58,422 lbs) basic
28,900 kg (63,714 lbs) with utility boom