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DD421

Former model: DD420, Tamrock Axera 7 Sandvik DD421 is the high performance twin-boom jumbo for up to 60 m² 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.

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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 ½ in) Coverage area DD421 8-60 m² Weight DD421 19000-25000 kg 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 (2656 KB, 3 June 2011)