Dango & Dienenthal
Corporate brand
UnclaimedDango & Dienenthal is a German family-owned engineering group specializing in machinery and systems for metallurgy, forging, heat treatment, and industrial liquid filtration.
Last updated November 4, 2026
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Overview
Dango & Dienenthal is a German family-owned mechanical engineering company headquartered in Siegen. Founded on 1 June 1865 by August Dango and Louis Dienenthal, the business began as a non-ferrous metal foundry and turning shop producing small bronze and gunmetal fittings. Over more than a century and a half, it developed from a local metalworking enterprise into a specialized international engineering group serving steelmaking, non-ferrous metallurgy, forging, heat treatment, mining, forestry, and industrial water-management applications. The company’s historical development has been closely associated with the successive generations of the two founding families. Its early expansion was enabled by the installation of a steam boiler in 1871, which allowed the production of larger fittings and iron and machine castings. A new foundry was constructed at the Siegen site around the turn of the twentieth century. After the founders left the business around 1899–1901, management passed to the second generation. In 1936, Bernhard Dango and Herbert Dienenthal assumed responsibility and reorganized the enterprise as a limited partnership. During this period, the business increasingly shifted from foundry work toward mechanical engineering. The Second World War was a traumatic period in the company’s history. The business supplied machinery to industrial customers, including major orders for the Soviet steel industry shortly before Germany’s attack on the Soviet Union. Wartime shortages, conscription, export restrictions, and the production of war-related machinery affected operations. The company also employed foreign forced laborers; historical accounts identify approximately 60 foreign forced laborers among a workforce of about 200 in 1944, including Anna Sahirna, who died in Siegen in 1943. Air raids in 1944 largely destroyed the plant and eliminated much of the historic site, including the founding family’s residential building. Reconstruction began after the war under Herbert Dienenthal and Bernhard Dango, initially under restricted production authorization. From the postwar decades onward, Dango & Dienenthal progressively concentrated on specialized machinery for metallurgical production. Traditional blow-mold production ended in the 1960s, while the product range expanded to include taphole closing and drilling machines, blast-furnace measuring probes, skimming machines, charging and poking devices, manipulators, and tool-changing systems. The fourth generation joined the business during the 1960s and 1970s, and the company’s international orientation was strengthened by the backgrounds of Manfred Dango and Jörg Dienenthal, who had received training in the United States and the United Kingdom. A holding-company and operating-company structure was introduced in 1978. Dango & Dienenthal KG served as the holding entity, while Dango & Dienenthal Maschinenbau GmbH operated the principal engineering business. The Siegen plant was expanded to support the assembly of very large machines, including equipment weighing up to approximately 265 tonnes. International subsidiaries followed in South Africa in 1982 and the United States in 1986. The filter-technology division became an independent subsidiary in 1990, establishing a second major business area alongside heavy mechanical engineering. The group continued to internationalize during the 1990s, establishing a production site in India in 1998 and a Japanese sales and service company in 1999. Computer-aided design and computer-numerical-control methods were introduced progressively from the late 1980s. In 2001, Rainer Dango succeeded Manfred Dango as managing director. Arno Dienenthal joined the management in 2009, representing the fifth generation of the family enterprise. Dango & Dienenthal also expanded through partnerships and acquisitions. Cooperation with Luxembourg-based Paul Wurth began in 2003 and led to TMT Tapping Measuring Technology, a joint venture focused on taphole and measuring technology for blast furnaces and non-ferrous melting furnaces. Hencon B.V. became part of the group in 2015, broadening activities into mobile equipment for aluminum, mining, forestry, and biomass production. The group therefore combines core metallurgical engineering with filtration technology and specialized mobile machinery. Since 2023, Jens-Uwe Heitsch and Alexander Neff have supplemented the management team, while Rainer Dango, Andreas Dango, and Jörg Dienenthal remain shareholders. Andreas Dango also took over management of TMT in 2023.
History
Dango & Dienenthal was established in Siegen on 1 June 1865 by August Dango and Louis Dienenthal. The original business combined a non-ferrous foundry with a turning shop and made small bronze and gunmetal fittings. Registration followed on 16 July 1865. The installation of a steam boiler in 1871 enabled larger fittings, iron castings, and machine castings, while a new foundry was built at the Siegen site in 1899–1900. The founders’ departures at the end of the nineteenth and beginning of the twentieth centuries transferred control to the next generation. In 1936, Bernhard Dango and Herbert Dienenthal took over management and converted the business into a Kommanditgesellschaft. Under their leadership, the enterprise moved increasingly toward mechanical engineering. The company operated with about 250 employees in 1938–1939 and undertook industrial orders, including significant deliveries to the Soviet steel industry before Germany’s 1941 invasion of the Soviet Union. Wartime conditions brought raw-material shortages, personnel losses through conscription, export restrictions, and the manufacture of war-related machinery. The company used foreign forced labor on a substantial scale. In 1944, around 60 of approximately 200 employees were foreign forced laborers. One documented forced-labor victim, Anna Sahirna, died in Siegen in 1943 from pulmonary tuberculosis. Air raids in 1944 devastated the factory and destroyed the historic family residence. Reconstruction began after the war under the second-generation leaders, although production remained restricted until authorization was restored. During the 1950s and 1960s, the plant was modernized and expanded. The company discontinued blow-mold production between 1963 and 1965 after more than a century in that field. At the same time, it developed a more specialized machinery portfolio for metallurgical plants, including taphole closing and drilling machines, blast-furnace horizontal measuring probes, skimming machines, charging and poking equipment, manipulators, and tool-changing systems. Manfred Dango became managing director in 1969, and Jörg Dienenthal joined the company in 1973. Their international training, particularly in the United States and United Kingdom, supported the company’s broader international outlook. In 1978, the organization was separated into the Dango & Dienenthal KG holding company and Dango & Dienenthal Maschinenbau GmbH as the principal operating company. Expanded assembly and office facilities at Siegen allowed the production of machines weighing up to roughly 265 tonnes. The group established subsidiaries in South Africa in 1982 and the United States in 1986. Its filter-technology activities were separated into an independent subsidiary in 1990. From the late 1980s, CAD and CNC technology were introduced gradually into production and engineering. The company briefly faced public criticism in 1991 over a delivery contract involving Iraq, but the accusations were refuted. International expansion continued with an Indian production site in 1998 and a Japanese sales and service company in 1999. In early 2001, Rainer Dango succeeded Manfred Dango in management. Arno Dienenthal joined the management in 2009, marking the involvement of the fifth generation. A cooperation with Paul Wurth began in 2003 and produced the TMT Tapping Measuring Technology joint venture, based in Siegen and Luxembourg. TMT focuses on taphole and measuring technology for blast furnaces and non-ferrous melting furnaces. The acquisition of Kring Transfer Technologie in 2009 broadened TMT-related activities, although TMT no longer held shares in that business. In 2015, Hencon B.V. joined the Dango & Dienenthal Group. Hencon operates through Metal & Mining and Forestry activities, supplying mobile equipment for aluminum, mining, forestry, and biomass applications. Since 2023, Jens-Uwe Heitsch and Alexander Neff have supplemented the management team. Rainer Dango, Andreas Dango, and Jörg Dienenthal remain shareholders, and Andreas Dango additionally manages TMT. The group today combines metallurgical machinery, filtration systems, mobile industrial equipment, and related service capabilities while retaining family ownership across the founding lineages.
- 2023
Management team supplemented
[1]Jens-Uwe Heitsch and Alexander Neff joined the management team, while Andreas Dango assumed management of TMT.
- 2015
Hencon joins the group
[1]Hencon B.V. became part of the Dango & Dienenthal Group, expanding its activities into mobile equipment for aluminum, mining, forestry, and biomass production.
- 2009
Fifth-generation management expanded
[1]Arno Dienenthal joined the management. The group also acquired Kring Transfer Technologie in connection with the broader TMT business activities.
- 2003
TMT joint venture formed
[1]Cooperation with Paul Wurth led to the creation of TMT Tapping Measuring Technology for blast-furnace and non-ferrous-furnace tapping and measuring applications.
- 2001
Rainer Dango becomes managing director
[1]Rainer Dango succeeded his father, Manfred Dango, in management and represented the next generation of family leadership.
- 1999
Japanese sales and service company established
[1]Dango & Dienenthal added a Japanese sales and service operation to its international network.
- 1998
Indian production site opened
[1]The group established a production site in India with approximately 25 employees at the time.
- 1990
Filter technology spun off
[1]The filter-technology division became an independent subsidiary, creating a distinct group business focused on liquid filtration.
- 1986
United States subsidiary established
[1]Dango & Dienenthal expanded its international network with a subsidiary in the United States.
- 1982
First international subsidiary
[1]The company established an international subsidiary in South Africa.
Products and positioning
A long-established, family-owned German specialist engineering group positioned around customized heavy machinery, process equipment, and service capabilities for demanding metallurgical and industrial applications. Its differentiation rests on engineering expertise, large-machine handling, process integration, international project support, and continuity across generations.
Metallurgical engineering
Forging machinery and manipulators
Dango & Dienenthal develops machinery for open-die forging, closed-die forging, and ring rolling. Its forging manipulators and associated handling systems move and position heavy workpieces during forming operations. The equipment is designed for demanding industrial environments in which load capacity, precision, integration with presses or mills, and reliable process handling are central requirements. The company is identified in reference material as a world-market specialist in forging manipulators.
Metallurgical engineering
Heat-treatment equipment
The company supplies machinery and handling systems used in the heat treatment of forged products. These systems support the movement and processing of semi-finished and finished metal products through industrial heating and treatment operations. The offering forms part of the group’s broader capability in integrated equipment for forging plants and metallurgical production lines.
Metallurgical process equipment
Taphole and furnace-measuring technology
Dango & Dienenthal and its TMT joint venture provide taphole closing and drilling machines, blast-furnace measuring probes, and related systems for tapping and process measurement. The technology serves blast furnaces and melting furnaces in non-ferrous metallurgy. Activities include development, production, distribution, maintenance, and service for equipment used in high-temperature metal-production environments.
Metallurgical handling equipment
Charging, poking, skimming, and tool-changing systems
The metallurgical portfolio includes charging and poking devices, skimming machines, and tool-changing systems. These machines assist with material loading, furnace operations, removal of surface material, and automated or semi-automated tool handling. They are supplied as specialized equipment for steelmaking, non-ferrous metallurgy, and related high-temperature industrial processes.
Metal-processing machinery
Pipe manufacturing machine
Dango & Dienenthal developed a pipe manufacturing machine that combines measurement and sizing in one unit. The integrated approach is intended to support dimensional control and processing efficiency in pipe production. The product illustrates the company’s emphasis on specialized machinery that combines several process functions within a single industrial system.
Filter technology
Industrial filtration systems
Dango & Dienenthal Filtertechnik develops automatic and manual filtration systems for river water, cooling water, process water, and other liquid media. The product range serves a wide range of industrial sectors and includes separators such as the Mussel Stop system, designed to limit the spread of mussel larvae, particularly zebra mussels, in industrial cooling systems.
Industrial and mobile machinery
Hencon mobile special-purpose equipment
Through Hencon B.V., the group develops, manufactures, and services mobile special-purpose equipment for the aluminum, mining, forestry, and biomass industries. Hencon is organized around Metal & Mining and Forestry activities. Its forestry business also acts as an official distributor of John Deere forestry machines in Germany and provides associated sales and service support.
Industrial manufacturing services
Contract manufacturing
The company offers contract manufacturing and heavy mechanical fabrication in addition to its own engineered products. This capability leverages its large assembly facilities, machining expertise, and experience with components and machines for demanding metallurgical applications. The available reference material does not specify the full range of contract-manufacturing services or customer sectors.
Controversies
1991
Criticism concerning an Iraq delivery contract
Dango & Dienenthal briefly faced criticism over a delivery contract involving Iraq. The company rejected and refuted the accusations. The available reference does not establish a finding of wrongdoing.
1944
Forced labor during the Second World War
Historical accounts state that the company employed foreign forced laborers during the war. Approximately 60 foreign forced laborers were recorded among about 200 employees in 1944. Anna Sahirna, born in the Soviet Union, is identified as one victim and died in Siegen in 1943 from pulmonary tuberculosis.
Brand decisions
2023
Expand the management teamStrategyBackground
The family-owned group continued its multigenerational governance while adding external or additional management capacity.
Action taken
Jens-Uwe Heitsch and Alexander Neff supplemented the management team, and Andreas Dango assumed management of TMT.
Aftermath
The company retained family shareholders while broadening operational leadership across the group and its joint venture.
2015
Bring Hencon into the groupM&ABackground
The group aimed to broaden its industrial machinery activities beyond fixed metallurgical plant equipment.
Action taken
Hencon B.V. became part of the Dango & Dienenthal Group, adding mobile equipment activities for aluminum, mining, forestry, and biomass production.
Aftermath
The group expanded into two Hencon business units: Metal & Mining and Forestry.
2003
Establish the TMT joint ventureM&ABackground
Dango & Dienenthal sought to deepen its position in tapping and furnace-measuring technology for ferrous and non-ferrous metallurgy.
Action taken
The company cooperated with Paul Wurth to establish TMT Tapping Measuring Technology, with locations in Siegen and Luxembourg.
Aftermath
TMT became a specialist supplier of taphole and measuring technology for blast furnaces and non-ferrous melting furnaces.
1990
Create an independent filter-technology subsidiaryStrategyBackground
Filter technology had developed into a distinct business area alongside heavy mechanical engineering.
Action taken
The filter-technology division was spun off as an independent subsidiary, later known as Dango & Dienenthal Filtertechnik GmbH.
Aftermath
The group maintained a separate industrial filtration business serving liquid-media applications across multiple sectors.
1978
Separate the holding and operating companiesStrategyBackground
The growing engineering business required a structure that distinguished group ownership and coordination from operating activities.
Action taken
Dango & Dienenthal KG became the holding company, while Dango & Dienenthal Maschinenbau GmbH became the principal operating company.
Aftermath
The structure supported continued expansion of the metallurgical machinery business and later group diversification.
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