Theis Group

What Theis Group does

Karl Theis GmbH, operating as Theis Group, is a German family-owned precision manufacturer of custom tube bending components, founded in 1926 in Siegen, Nordrhein-Westfalen, and currently in its third generation of family management under Klaus Eibach. The company produces five core product lines — half tubes and coiled half tubes, tube coils and tube systems, tube bends and bent components, flow funnels (Stromtrichter) per DIN 28127, and U-tubes — alongside a wholly-owned subsidiary, ETU Rohr GmbH (acquired 2008, operating as the ETU Tube Technologies brand) that specializes in heat-exchanger U-tubes. Manufacturing is performed on CNC segment and 3-roll bending machines, conventional bending machines, and an in-house developed half-tube bending machine introduced in 2013, with TIG welding by EN ISO 9606-1 certified welders and a comprehensive in-house non-destructive testing capability (X-ray, dye penetration, magnetic particle, ultrasonic, endoscopy, vacuum). Total infrastructure spans roughly 6,000 m² of production area and approximately 17,000 m² of land at the Breite Straße site, with 25+ permanent employees and apprentices.

The business model is project-based B2B custom manufacturing sold through direct enterprise field sales, with named contacts handling customer engagement from design through final acceptance and pricing determined per quotation. The customer base spans chemical, petrochemical, pharmaceutical, food, oil & gas, energy, shipbuilding, mechanical engineering, rail, architecture, and other industrial verticals, and revenue is generated from one-off sales of custom components plus value-added services (heat treatment, pickling, sandblasting, grinding, laser work, mechanical processing). Multiple certifications — TÜV SÜD DIN EN ISO 9001:2015, TÜV Nord AD 2000-Merkblatt HP0/HP100 R/TRD 201, DIN EN ISO 3834-2, and PED 2014/68/EU — qualify the company to supply pressure-bearing components to regulated European process industries. Marketing is conducted through the company website and direct sales; there is no disclosed digital product, API, or app offering, no public pricing, and no external institutional investment.

Name

Theis Group

Legal name

Karl Theis GmbH

Website

https://theis-tubes.com

Company type

Private

Founded year

1926

Operating status

Operating

Headcount range

1–10 employees

Short description

Karl Theis GmbH is a German family-owned precision tube bending manufacturer founded in 1926, producing custom half tubes, tube coils, bends, flow funnels, and U-tubes for chemical, pharmaceutical, food, oil & gas, and energy industrial customers.

Ownership category

akta.pro rank

Headquarters

HQ city

Siegen

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Custom tube bending components: One-time product sales of custom-manufactured tube systems including half tubes, tube coils, tube bends, flow funnels, and U-tubes. Revenue generated from manufacturing precision components to customer specifications for industrial applications.
2. Custom manufacturing services: Additional revenue from value-added services including heat treatment, pickling, sandblasting, grinding, laser work, and mechanical processing of customer materials

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Karl Theis GmbH manufactures custom bent tube components for industrial customers, including half tubes and coiled half tubes, tube coils and tube systems, tube bends and bent components, flow funnels (Stromtrichter), and U-tubes (via subsidiary ETU Rohr GmbH). The company produces these parts on CNC segment and 3-roll bending machines and conventional bending equipment from materials supplied to specification, supported by in-house tool manufacturing, TIG welding, and non-destructive testing services. Deliverables are one-off custom fabrications tailored to the technical drawings and certifications required by chemical, petrochemical, pharmaceutical, food, energy, and oil & gas customers.

Product overview

Theis Group (Karl Theis GmbH) is a precision tube bending technology company offering a diversified product portfolio of tube systems. The core offering consists of five main product lines: Half Tubes and Coiled Half Tubes (the company's pioneering product line manufactured from slit strips), Tube Coils and Tube Systems (from simple structures to complex assemblies), Tube Bends and Bent Components (using CNC segment and 3-roll bending machines), Flow Funnels (streamlined connections for heating apparatus), and U-Tubes (produced through subsidiary ETU Tube Technologies). The company operates with over 90 years of experience and serves industries including chemical, pharmaceutical, food, oil and gas, energy, mechanical engineering, shipbuilding, and architecture. Manufacturing takes place at approximately 6,000 m² production area with more than 25 permanent employees.

Differentiator

Problem solved

Functional benefit

Brands

• ETU Tube Technologies: Brand for U-tube products, operated through subsidiary ETU Rohr GmbH (100% subsidiary of Karl Theis GmbH) for heat exchanger U-tubes in rounded or squared configurations with high-grade alloys.

Products and services

• Half Tubes and Coiled Half Tubes Weld-on half-tube profiles used for heating and cooling purposes in chemical, pharmaceutical, food, and vehicle manufacturing industries, available in cylindrically bent, straight, and conically bent variants and manufactured from slit strips. Designed for heat exchanger and vessel applications.
• Tube Coils and Tube Systems
• Tube Bends and Bent Components Tube bends and custom bent components produced using CNC segment bending machines and conventional bending machines, available in a wide range of types and materials (tube dimensions 6.0 to 323.9 mm), with non-destructive testing capabilities. Used in apparatus engineering, chemical, and process industry equipment.
• Flow Funnels (Stromtrichter)
• U-Tubes (via ETU Tube Technologies) U-tubes produced by ETU Rohr GmbH, a 100% subsidiary of Karl Theis GmbH, offered as dimensionally accurate solutions in high-grade alloys with purity and quality tests, available in rounded or squared configurations. Used in heat exchangers.

Quantifiable outcome

• Manufacturing capability up to 100m without transverse joint for half tubes
• +2 more outcomes

Segments15 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• ETU Rohr GmbH (ETU Tube Technologies)coreTechnology or IntegrationETU Rohr GmbH is a 100% subsidiary of Karl Theis GmbH. It specializes in the production of heat-exchanger U-tubes, providing dimensionally accurate solutions produced from high-grade alloys with purity and quality testing. The subsidiary complements Karl Theis GmbH's product portfolio, with ETU Tube Technologies operating as a separate brand.

Scale indicators6 records

Recent moves10 records

Expansion highlights4 records

Broad incumbents

• voestalpine: Austrian steel and technology group producing welded and seamless tubes for industrial and energy applications. Comparable as a European manufacturer of specialty industrial tubes serving chemical, oil & gas, and mechanical engineering customers.
• Wieland Group: German manufacturer of copper, brass, and high-performance alloy tubes and components serving HVAC, refrigeration, and industrial markets. Comparable as a European tube manufacturer serving industrial heat-transfer applications, though with broader product scope.
• Vallourec: French-headquartered global leader in premium seamless tubes for energy, industry, and construction. Comparable as a major supplier of heat-exchanger and process tubes overlapping with Theis's oil & gas, power, and chemical customer segments.
• BENTELER International AG: Austrian/German automotive and steel-processing group with a significant tube and components division serving industrial and chassis applications. Comparable as a large-scale European manufacturer of bent and formed steel tubes for industrial customers.
• Salzgitter AG / Salzgitter Mannesmann: Major German steel and tube producer via its Mannesmann line, supplying seamless and welded tubes for energy, chemical, and mechanical engineering. Comparable as a large European supplier of industrial tubes, though at much greater scale.

Direct peers

• Dockweiler AG: German specialty tube manufacturer focused on stainless steel, high-purity, and U-tubes for semiconductor, chemical, and instrumentation applications. Comparable as a German specialist producing custom tubes for industrial and regulated customers.
• FRANK GmbH: German manufacturer of custom tube systems and components, particularly for heating apparatus and process equipment. Closely comparable to Theis in scale, geography, and product focus on custom-formed tubes for industrial heating and cooling.
• Alleima: Swedish specialty steel-tube manufacturer (formerly Sandvik Materials Technology) producing seamless tubes for heat exchangers, chemical, and oil & gas applications — directly overlapping with Theis's core industrial heat-exchanger tube business.
• Senior Flexonics: Custom-engineered flexible tube and expansion-joint manufacturer (part of Senior plc) serving chemical, petrochemical, power, and OEM customers. Closest comparable to Theis in terms of custom-formed tubes for industrial heat-transfer and process applications.
• Butting: German manufacturer of stainless steel pipes, tubes, and custom components serving chemical, pharmaceutical, and food industries. Comparable as a German specialty tube manufacturer serving overlapping regulated customer segments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/theis-group

Revenue estimate

Valuation estimate

Number of profiles

Profiles12 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Theis Group