Demag
Corporate brand
UnclaimedDemag is a historic German heavy-engineering group and industrial brand best known for cranes, hoists, material-handling systems, construction machinery, and related industrial equipment.
Last updated August 31, 2026
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Overview
Demag was a major German heavy-equipment and industrial-engineering group whose businesses developed into several independently owned companies and brands. Its origins reach back to Mechanische Werkstätten Harkort & Co., established in Wetter an der Ruhr in 1819, and to the Stuckenholz engineering business, which began manufacturing cranes in the nineteenth century. The corporate group identified with the Demag name was formed in Duisburg in 1910 through the combination of Märkische Maschinenbau-Anstalt L. Stuckenholz AG, Duisburg Mechanical Engineering AG, and Benrath Machine Works GmbH. The name was derived from Deutsche Maschinenfabrik and became widely associated with German industrial engineering. Cranes and material handling were central to Demag's identity. Its historical portfolio included bridge cranes, overhead cranes, gantry cranes, hoists, workshop-crane equipment, and systems for steelworks, ports, factories, and other heavy industrial sites. The group also pursued a broad diversification strategy. From 1925 it manufactured excavators, and it later expanded into locomotives, railway vehicles, mobile cranes, steelmaking and rolling-mill technology, compressors, conveying systems, injection-moulding machinery, and other industrial products. In 1908, a predecessor company designed a large floating crane for Harland & Wolff in Belfast, an installation associated with the construction of the Olympic-class ocean liners. Demag's history also includes military production during the Second World War. Its Berlin Staaken plant produced armoured vehicles, including Bergepanther recovery vehicles, while Demag-designed half-track vehicles and their derivatives were used by the German military. This wartime role forms part of the group's industrial history but is distinct from the later commercial identity centered on cranes and factory equipment. In 1973 Demag came under the ownership of Mannesmann. During the following decades, its divisions were reorganized, combined with other industrial businesses, or transferred to specialist successors. Its steel and rolling-mill activities became associated with the business that developed into SMS group; its compressor business was sold to CompAir; and its plastics machinery activities were combined with Krauss-Maffei and later passed through several ownership structures. The Mannesmann takeover by Vodafone in 2000 triggered a further break-up of the industrial portfolio. Siemens and Bosch acquired the former Atecs industrial businesses and subsequently sold or reorganized individual Demag-related units. In 2001 Siemens sold core Demag crane, Gottwald, and related activities to Kohlberg Kravis Roberts, with Siemens retaining a minority interest in the relevant holding structure. KKR refocused the crane business around overhead cranes, hoists, gantry cranes, portal cranes, and port technology. Demag Cranes AG was created through the consolidation of Demag Cranes & Components and Gottwald Port Technology and was listed in 2006. Terex acquired a controlling stake in Demag Cranes in 2011, making the business part of Terex's Material Handling & Port Solutions division. The Demag name subsequently continued through multiple owners. Konecranes acquired Terex's Material Handling & Port Solutions business in 2017 and restored the Demag Cranes & Components name for the overhead-crane and related operations. Terex's mobile-cranes business was sold to Tadano in 2019 and became Tadano Demag GmbH; Tadano later announced the removal of the Demag name from that mobile-crane business. Separately, the former Demag plastics machinery operations became Sumitomo (SHI) Demag after Sumitomo Heavy Industries acquired the business in 2008. As a result, Demag is best understood today as a historically connected industrial name appearing across successor businesses rather than as a single unified corporation with all of the original group's activities.
History
The industrial roots later associated with Demag extend to Mechanische Werkstätten Harkort & Co., founded in Wetter an der Ruhr in 1819. The predecessor businesses developed expertise in machinery and crane construction, with crane production established by the 1840s. A large floating crane designed in 1908 for Harland & Wolff demonstrated the engineering scale of the business and was used in Belfast shipbuilding operations. The corporate Demag group was formed in 1910 in Duisburg when Märkische Maschinenbau-Anstalt L. Stuckenholz AG, Duisburg Mechanical Engineering AG, and Benrath Machine Works GmbH were combined into Deutsche Maschinenfabrik. Demag, the company's telegram abbreviation, became the better-known commercial name. Crane construction remained a core activity, including bridge, overhead, gantry, and hoist equipment, but the group expanded into many other areas of heavy industry. From 1925 Demag produced excavators and subsequently entered locomotives, railway vehicles, construction machinery, mobile cranes, conveying systems, compressors, steelworks technology, and plastics machinery. Its wartime manufacturing included military vehicles and armoured recovery equipment. After the war, Demag developed hydraulic excavators and broadened its construction and industrial-equipment portfolio. It also became a significant producer of injection-moulding machinery. Mannesmann assumed ownership in 1973. During the Mannesmann period, Demag businesses were repeatedly reorganized. A joint venture with Komatsu contributed to the separation of large-scale excavation activities, while steel and rolling-mill technology moved into successor organizations associated with SMS group. The compressor operation was sold to CompAir in 1996. In 1999 the plastics machinery activities were combined with Krauss-Maffei, eventually becoming part of structures known as Mannesmann Plastics Machinery and Demag Plastics. The 2000 Vodafone acquisition of Mannesmann separated telecommunications from the industrial portfolio. Siemens and Bosch acquired the industrial holding Atecs Mannesmann and later disposed of its constituent businesses. Siemens sold core crane and related Demag activities to a KKR-controlled holding structure in 2001. KKR concentrated the business on cranes, hoists, port technology, and associated material-handling products. Demag Cranes & Components and Gottwald Port Technology were consolidated as Demag Cranes AG, which was publicly listed in 2006. Terex acquired control of Demag Cranes in 2011 and operated it as part of Material Handling & Port Solutions. In 2017 Konecranes acquired that division and restored the Demag Cranes & Components designation for the overhead-crane business. Other successor operations followed separate paths: the plastics machinery business was acquired by Sumitomo Heavy Industries in 2008 and became Sumitomo (SHI) Demag, while Terex's mobile-crane activities were sold to Tadano in 2019. These transactions fragmented the original group, so the Demag name now refers to a family of successor businesses and product brands rather than the former unified industrial conglomerate.
- 2019
Mobile-crane business sold to Tadano
[1]Tadano acquired the Demag mobile-crane business from Terex.
- 2017
Konecranes acquires material-handling operations
[1]Konecranes acquired the Terex material-handling and port-solutions business and continued the Demag name in overhead-crane operations.
- 2011
Terex gains control
[1]Terex acquired a controlling interest in Demag Cranes and placed it within Material Handling & Port Solutions.
- 2006
Demag Cranes AG listed
[1]Demag Cranes and Gottwald were consolidated under Demag Cranes AG, which completed its public listing.
- 2001
Core activities sold to KKR-controlled holding
[1]Siemens sold the core Demag crane and related businesses to a KKR-controlled holding structure.
- 1973
Mannesmann ownership begins
[1]Demag was acquired by the Mannesmann group.
- 1954
First hydraulic excavators
[1]Demag developed its first hydraulic excavators and continued expanding into construction machinery and other industrial technologies.
- 1925
Expansion into excavators
[1]Demag expanded beyond cranes into excavator manufacturing.
- 1910
Deutsche Maschinenfabrik is formed
[1]Three German engineering companies were united in Duisburg to form Deutsche Maschinenfabrik, commonly identified by the Demag abbreviation.
- 1908
Large floating crane designed for Belfast
[1]A predecessor company designed a large floating crane for Harland & Wolff in Belfast.
Products and positioning
German-engineered industrial equipment with a strong historical emphasis on lifting, crane, material-handling, and heavy-manufacturing applications.
Material-handling equipment
Demag overhead cranes
Demag's best-known product family consists of overhead and bridge cranes for factories, workshops, warehouses, steel plants, and other industrial environments. These systems are typically configured for a customer's building, load profile, duty cycle, span, and automation requirements. The historical product scope included crane structures, drives, controls, and related lifting equipment.
Lifting equipment · 1910
Demag electric hoists
Electric hoists are used as the lifting mechanisms on cranes and as standalone equipment in production and maintenance environments. Demag's hoist development has been closely associated with its crane business, including electric motor hoists and later digitally monitored equipment. A smart hoist with self-diagnostic capability was reported in 2005.
Port equipment · 1956
Gottwald port cranes
Gottwald, a Demag-associated port-technology business, developed mobile harbour cranes and other port-handling systems. Its products served container, bulk, project-cargo, and general cargo operations. The business was combined with Demag Cranes and later passed through Terex and Konecranes ownership structures.
Construction machinery
Demag mobile cranes
Demag mobile cranes formed a separate successor business within Terex before being sold to Tadano in 2019. The operation became Tadano Demag GmbH and was later subject to insolvency proceedings and a restructuring process. Tadano subsequently announced that the Demag name would be removed from this mobile-crane business.
Plastics machinery
Sumitomo (SHI) Demag injection-moulding machines
Demag's historical plastics-machinery activities were combined with Krauss-Maffei and later acquired by Sumitomo Heavy Industries. The successor business is known as Sumitomo (SHI) Demag and supplies injection-moulding machinery, but it is not part of the original unified Demag group.
Brand decisions
2017
Konecranes acquisition of Terex MHPSM&ABackground
Terex decided to divest its Material Handling & Port Solutions activities.
Action taken
Konecranes acquired the division, including the Demag overhead-crane and Gottwald port-technology businesses, and continued the Demag Cranes & Components name.
Aftermath
The Demag name returned to a European-owned material-handling group, while other Demag successor businesses remained separately owned.
2011
Terex takeoverM&ABackground
Terex sought to expand its presence in material handling and port solutions.
Action taken
Terex acquired control of Demag Cranes and integrated the company into its Material Handling & Port Solutions division.
Aftermath
The Demag crane and port businesses operated within Terex until their sale to Konecranes in 2017.
2006
Creation and public listing of Demag Cranes AGStrategyBackground
KKR reorganized Demag Cranes & Components and Gottwald Port Technology around material handling and port equipment.
Action taken
The two businesses were brought under the Demag Cranes AG umbrella, followed by a public listing in June 2006.
Aftermath
Demag operated as a separately listed crane and port-technology company until its acquisition by Terex.
2001
Sale of core Demag activities to KKRM&ABackground
Following the break-up of Mannesmann's industrial portfolio after Vodafone's takeover, Siemens reassessed the ownership of its Demag-related businesses.
Action taken
Siemens sold the core Demag crane, Gottwald, and related activities to a Luxembourg holding structure in which funds advised by KKR held the controlling interest and Siemens retained a minority stake.
Aftermath
The transaction enabled a focused crane and port-technology business that was later consolidated as Demag Cranes AG.
Recent events
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