Road Headers

In 1968 we developed the Mitsui Road Header S40, the first road header manufactured in Japan.
Our first load header, the S40 had a 40kW cutting motor and weighed 15 tons. Since then, our road headers have become more powerful and heavier to satisfy evolving requirements. Our top-of-the-line SLB-350S road header has a 350kW cutting motor and weighs 120 tons, making it one of the world’s largest.
We have manufactured and delivered over 500 road headers to date, which are widely evaluated for their efficiency and high quality by our customers around the world. We are recognized as one of the world’s leading manufacturers of road headers.

What is a Road Header?

Also called a partial face machine, a road header is a tunneling machine. Its boom-mounted drum with a cutting head revolves to excavate rock or ore.
The main applications of road headers are tunneling for roads and railroads and mining.

Mitsui Road Header Line-up

SLB-350S Road Header

SLB-350S Features

SLB-350S is designed for highly efficient tunneling apt for high-speed soft rock excavation with large volume and for powerful medium-hard rock excavation.
SLB-350S is equipped with a 350/350kW (rated output) 2-speed motor, which is the most powerful motor manufactured in Japan in this field. SLB-350S achieves powerful excavation of not only soft rock but also medium-hard rock.
The telescopic mechanism enables flexible excavation from a fixed position.

SLB-350S Main Specifications

Total length Approx. 18m
Total height 4.8m
Total width (crawler width) 3.4m (3.2m)
Total weight Approx. 120 tons
Max. cutting height 8.8m
Max. cutting width 8.8m
Under cut 0.45m
Cutting motor 350/350kW-4/6P

SLB-300S Road Header

SLB-300S Features

The SLB-300S road header is suitable for diverse geological conditions ranging from soft rock to medium-hard rock up to 100MPa and enables low-vibration tunneling.
SLB-300S uses a 300kW 2-speed motor, and has selectable drum rotation speed according to geological conditions. SLB-300S is suited to a wide range of applications.
The telescopic mechanism enables flexible excavation from a fixed position.

SLB-300S Main Specifications

Total length Approx. 13.5m
Total height 4.8m
Total width (crawler width) 3.4m (3.2m)
Total weight Approx. 90 tons
Max. cutting height 8.8m
Max. cutting width 8.3m
Under cut 0.45m
Cutting motor 300/200kW-4/6P

MRH-S300 Road Header

MRH-S300 Features

The MRH-S300 road header is suitable for diverse geological conditions ranging from soft rock to medium-hard rock up to 130MPa and enables low-vibration tunneling.
MRH-S300 uses a 300kW 2-speed motor, and has selectable drum rotation speed according to geological conditions. SLB-300S is suited to a wide range of applications.
The telescopic mechanism enables flexible excavation from a fixed position.

MRH-S300 Main Specifications

Total length Approx. 20.8m
Total height 4.7m
Total width (crawler width) 4.0m (3.1m)
Total weight Approx. 95 tons
Max. cutting height 6.5m
Max. cutting width 7.5m
Under cut 0.45m
Cutting motor 300/150kW-4/8P

MRH-S200 Road Header

MRH-S200 Features

The MRH-S200 road header is suitable for diverse geological conditions ranging from soft rock to medium-hard rock up to 80MPa and enables low-vibration tunneling.
S200 uses a 200kW 2-speed motor that provides enough power to excavate medium-hard rock.
The telescopic mechanism enables flexible excavation from a fixed position.
Compact dimensions enable easy transportation to remote work sites.

MRH-S200 Main Specifications

Total length Approx. 11.5m
Total height 3.85m
Total width (crawler width) 2.9m (2.6m)
Total weight Approx. 49 tons
Max. cutting height 6.0m
Max. cutting width 6.4m
Under cut 0.35m
Cutting motor 200/110kW-4/8P

MRH-S100 Road Header

MRH-S100 Features

The MRH-S100 road header is suitable for diverse geological conditions ranging from soft rock to medium-hard rock up to 80MPa and enables low-vibration tunneling.
Equipped with a 100kW 2-speed motor, the MRH-S100 has plenty of power for excavation of medium-hard rock.
The telescopic mechanism enables flexible excavation from a fixed position.
Disassembled into small sections, this road header can be lowered through a shaft.

MRH-S100 Main Specifications

Total length Approx. 12.1m
Total height 1.8m
Total width (crawler width) 2.8m (1.9m)
Total weight Approx. 27 tons
Max. cutting height 4.5m
Max. cutting width 5.1m
Under cut 0.25m
Cutting motor 100/60kW-4/8P

MRH-S65 Road Header

MRH-S65 Features

The MRH-S65 road header is suitable for diverse geological conditions ranging from soft rock to medium-hard rock up to 60MPa and enables low-vibration tunneling.
Equipped with a 65kW motor, the MRH-S65 has plenty of power for excavation of medium-hard rock.
The telescopic mechanism enables flexible excavation from a fixed position.
Disassembled into small sections, this road header can be lowered through a shaft.

MRH-S65 Main Specifications

Total length Approx. 11.3m
Total height 1.5m
Total width (crawler width) 2.8m (1.8m)
Total weight Approx. 20 tons
Max. cutting height 3.8m
Max. cutting width 4.2m
Under cut 0.25m
Cutting motor 65kW-4P

Road Header Delivery Record

Applications

Road tunnels, highway tunnels, railroad tunnels, headrace tunnels, coal-mine drifts, etc.

Territories Currently Served

Japan, Australia, China, Russia, New Zealand, South Korea, India, Canada, the United States, Pakistan, Brazil, Indonesia, Myanmar