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Sandvik DD421

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Sandvik DD421
 Record Breaker
Sandvik DD421 boosts productivity in mine development and small scale tunneling. 
Powered by new efficient rock drills, robust booms and a wide selection of feeds, it offers an 
optimal coverage of 60 m2. 
The new carrier layout is specifically designed for safe access to all service points, and all 
daily maintenance is conducted at ground level. Adjustable drilling settings of the new hydraulic 
control system optimize drilling performance in any conditions. To ensure highly accurate 
drilling results and enable valuable feedback information of the drilling process, the drill rig can 
be equipped with TCAD™ instrumentation. 
The DD421 is the successor to the proven Sandvik DD420 drill rig, with even greater 
serviceability, and improved performance. The modular design makes training, operating and 
maintenance of the fleet easier.
Key features
 • Drilling booms providing 8 – 60 m2 cross sections
 • 25 kW rock drills
 • TCAD/TLOG instrumentation
 • Fast and efficient mobile carrier
Sandvik DD421-60C
Main dimensions, Sandvik DD421-60C
www.sandvik.com
Coverage and turning
Technical data
Model Drift size class
height x width
m (ft)
Coverage
m2 (ft2)
Max tunnel size
m (ft)
Rock drill Hole size
mm (in)
Feed 
length
ft
Controls Canopy
/ cabin
DD421-60 4.5 x 4.5 
(15 x 15)
8 - 60
(86 - 646)
6.6 x 9.9
(21’8” x 32’6”)
RD525
HLX5
43 - 64
(1 3/4 - 2 1/2)
10 to 16 Hydr. Canopy
DD421-60C 4.5 x 4.5
 (15 x 15)
8 - 60
(86 - 646)
6.6 x 9.9
(21’8” x 32’6”)
RD525
HLX5
43 - 64
(1 3/4 - 2 1/2)
10 to 16 Hydr. Cabin
DD421-S60C 4.5 x 4.5
 (15 x 15)
8 - 60
(86 - 646)
6.6 x 9.9
(21’8” x 32’6”)
RD525
HLX5
43 - 64
(1 3/4 - 2 1/2)
10 to 16 Electr. Cabin
3080
15° 18°
31
50
45
0
3530 1200
Feed Total length
TF 500–10’ 12 500
TF 500–12’ 13 050
TF 500–14’ 13 250
TF 500–16’ 13 700
TFX–6/12’ 12 800
TFX–8/14’ 12 900
TFX–10/16’ 13 000
9190
1500
9970
20
0
21
45
43
40
66
85
2310
R
3350
750
75
0
R1
W
10°
5°
40°
Feed R1 W
TF 500–10’ 6 650 3 770
TF 500–12’ 6 800 3 920
TF 500–14’ 6 950 4 070
TF 500–16’ 7 100 4 250
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