FlexiROC D55

Surface drill rigs for limestone and aggregate quarries, surface mining and construction.

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Efficient versatility

High productivity thanks to the robust and powerful feeding system

Atlas Copco´s FlexiROC DTH family ensures smooth and uniform feeding regardless of rock condition. The aluminum feed profile means harmful vibrations are reduced to a minimum; thus achieving optimum transmission of each percussive blow to fresh rock and more productive drilling.

Availability and serviceability due to high degree of parts commonality

The FlexiROC D55 has long service intervals, few parts, and a high degree of service and parts commonality with other Atlas Copco products. Two examples of shared design are the heavy duty chain feeding system and the robust and fast rod handling system.

Durability based on proven mining design

Built on a proven platform to ensure the highest efficiency, a short feed allows these workhorses to excel not only in production drilling, but also in auxiliary drilling such as toe-hole drilling.

Product description

FlexiROC D55 is an equally versatile and efficient down-the-hole drill rig that keeps your production up and your costs down. Thanks to its flexibility and overall drilling capacity, it’s just as perfect for quarry blast hole drilling as for mining operations. The precise DTH drilling empowered by our unique cylinder feeding improves blasting, and running at lower rpm means longer engine life, less fuel consumption and low lifetime cost. The reliable design keeps the rig where it belongs: in the quarry.

Quick facts

Technical data

Main application area

Mining ; Quarrying

Drilling method


Hole diameter

90 mm - 152 mm

Product family




Rock drill/DTH hammer size

4" ; 5"

Rotary head

DHR6 H 45 ; DHR6 H 56

Maximum hole depth

45 m


328 kW

Air capacity (FAD)

354 l/s (729 cfm) @30 bar l/s


Product variations apply. See brochure for more information.
Transport dimensions