Products > Drill rigs and rock drills > Underground drill rigs > Mining jumbos >
DD421


Former model: DD420, Tamrock Axera 7
Sandvik DD421 is the high performance twin-boom jumbo for up to 60 m headings. The new carrier layout is specifically designed for safe access to all service points, and all daily maintenance is conducted at ground level, without the need of opening any covers.
Sandvik DD411 is the single boom version of the same product.
Sandvik mining jumbo DD421

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Rock Tools and systems

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  • Features and values
  • Accurate and fast drilling in drifting and small scale tunneling
  • High productivity
  • Safety canopy or enclosed cabin (C)
  • Upgraded control system
  • Safe and easy to maintain

  • Key specifications

Hole size
DD421
43-64 mm (1 11/16-2 in)

Coverage area
DD421
8-60 m

Weight
DD421
19 000-25 000 kg (41 888-55 116 lb)

Major components
Rock Drill
RD525
HLX5
Boom
TB60
Feed
TF or TFX
Control system
DD421-60
DD421-60C
THC561, hydraulic system
DD421-S60
DD421-S60C
TPC562, electrically controlled hydraulic system
Carrier
NC7W
Engine
MB904LA, 110 kW, Tier III

Specification Sandvik DD421-60
(1942 KB, 28 May 2013)
Specification Sandvik DD421-60C
(1821 KB, 28 May 2013)
Specification Sandvik DD421-S60C
(1798 KB, 28 May 2013)
Specification Sandvik DD411-60
(1170 KB, 28 May 2013)