What BOA Group does

BOA Group is a German manufacturer of flexible mechanical elements for gas and fluid transportation, with manufacturing heritage dating to 1870 in Stutensee. The company designs and produces metal bellows, expansion joints, exhaust system components, fuel system precision parts, and high-frequency dampers from flexible stainless steel, serving automotive manufacturers, aerospace companies, and industrial clients in the energy, shipping, rail, and heavy engine sectors. With over 800 employees, BOA operates through four business divisions—BOA Industrial, BOA Automotive, BOA Aerospace, and BOA Hydrogen—reflecting its positioning across both mature and emerging end-markets.

The company's core technology centers on metal forming and welding of stainless steel, with proprietary capabilities including ultra-thin material welding down to 0.07mm, CFD software for pressure drop analysis, FEM-based validation, in-house S-N curve databases, and a corrosion chamber that simulates 10 years of corrosion in 1 year. Products are engineered for extreme performance envelopes—temperature ranges from -273°C to over 1,000°C, pressure capability up to 20 bars, leak-tightness standards to 1×10⁻⁹ mbar·l/s, and cycle durability exceeding 10⁶ pressure cycles. BOA has completed over 100 million successful welds across its customer base, feeding empirical data into proprietary engineering tools, including an in-house calculator capable of running up to 10,000 failure scenario combinations.

BOA generates revenue primarily through direct sales of custom-engineered components to enterprise OEMs, supplemented by bundled engineering services covering analysis, design, validation, and testing. Products are priced per project rather than via standardized list pricing, reflecting their bespoke nature. The company distributes through five global manufacturing facilities in Germany, Romania, China, the United States, and Mexico, supported by sales offices across Europe and North America. Since late 2018, BOA has been a wholly-owned subsidiary of Austrian industrial holding group Ring International Holding AG (RIH), which has consolidated revenues of up to EUR 500 million and approximately 3,000 employees across its portfolio.

Name

BOA Group

Legal name

BOA Metal Solutions GmbH

Website

https://boagroup.com

Company type

Private

Founded year

1870

Operating status

Operating

Headcount range

501–1,000 employees

Short description

BOA Group is a German manufacturer of flexible metal bellows, expansion joints, and exhaust/fuel system components for gas and fluid transportation. The 150-year-old company serves automotive, aerospace, industrial, and hydrogen sectors globally through five manufacturing facilities and over 800 employees.

Ownership category

akta.pro rank

Headquarters

HQ city

Denzlingen

HQ country

Germany

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Metal Bellows and Components Sales: Sale of flexible stainless steel components including metal bellows, expansion joints, exhaust components, fuel system components, and precision parts for automotive, aerospace, and industrial applications. Products are sold directly to manufacturers as custom-engineered solutions.
2. Custom Engineering Services: Customized engineering services for solving specific challenges in gas and fluid transportation, including analysis, design, validation, and testing services bundled with product sales.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

BOA Group manufactures flexible stainless steel components — including metal bellows, expansion joints, exhaust system components, fuel system components, and engine management elements — for automotive, aerospace, energy, shipping, rail, and heavy engine applications. The company operates five global manufacturing facilities, delivers custom-engineered solutions from design through validation, and serves industrial customers directly.

Product overview

BOA Group is a manufacturer of flexible mechanical elements for gas and fluid transportation. The product portfolio is organized across divisions: BOA Industrial (flexible elements for Energy, Shipping, Rail, Heavy Engine), BOA Automotive (engine management, exhaust systems, fuel systems for passenger cars and heavy vehicles), BOA Hydrogen (hydrogen and electric vehicle solutions), and BOA Aerospace (aerospace, shipping, railway). Core products include Metal Bellows (precision mini bellows from 3mm to custom large sizes), Expansion Joints (axial, standard DN 150, industrial up to DN 1,000, and specials), Exhaust Components (EnduroFlex hoses, thermal compensators, high-frequency dampers), and Fuel Systems Components (precision bellows, high-pressure pump capsules, fuel hoses). The company also offers Smart Tubes as next-generation lightweight solutions. All products are manufactured from flexible stainless steel and serve critical transportation applications across multiple industries.

Differentiator

Problem solved

Functional benefit

Products and services

• Metal Bellows Flexible stainless steel bellows manufactured in various sizes, including precision mini bellows from 3mm diameter, for automotive, aerospace, and industrial gas and fluid transportation applications.
• Expansion Joints Metal expansion joints for absorbing thermal expansion and mechanical vibrations in pipeline systems, available in standard products up to DN 150, industrial products up to DN 1,000, and custom sizes above DN 1,000.
• Exhaust Components High-tech exhaust system components including EnduroFlex flexible metal hoses, self-supporting decoupling elements, thermal compensators, and high-frequency dampers (HFD) for automotive applications.
• Fuel Systems Components Precision components for fuel systems including mini bellows for fuel injection, capsules for high-pressure pumps, and fuel/air conditioning hoses with high vacuum density up to 10^-8 mbar l/s.
• Engine Management Components Flexible mechanical elements for engine management systems in passenger cars and heavy vehicles.
• Smart Tubes Next-generation lightweight tubular modules delivering the same performance at half the weight compared to conventional solutions, designed for automotive applications.
• V-Clamps Lightweight V-clamp connections for industrial applications such as steam and gas turbines.

Quantifiable outcome

• Products maintain leak-tight seal for 15+ years, compared to rubber tubes lasting only a few years
• +7 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Witzenmann: German-headquartered specialist in metal bellows, expansion joints, and flexible metallic elements for automotive, industrial, and aerospace applications. The closest direct peer to BOA Group in product scope, technology (precision welding of thin-wall stainless steel), and end markets.
• Senior plc: UK-listed engineered solutions company with a Fluid Conveyance division (formerly Senior Flexonics) producing expansion joints, bellows, and flexible metal hose for aerospace, industrial, and automotive markets. Directly comparable in flexible metal element manufacturing.
• EagleBurgmann: Germany-based global leader in mechanical seals and supply systems, including expansion joints and flexible elements for process industries (oil & gas, chemicals, power). Comparable in industrial-grade metal bellows and sealing technology for critical fluid and gas applications.

Broad incumbents

• Trelleborg AB (Industrial Solutions): Swedish industrial group with a broad portfolio in polymer and engineered solutions, including anti-vibration mounts, sealing profiles, and flexible elements. Overlaps with BOA in vibration damping, thermal expansion compensation, and fluid handling for industrial and transportation customers.
• ContiTech (Continental AG): Industrial arm of Continental AG producing hoses, vibration control, and fluid handling systems for automotive and industrial customers. Overlaps with BOA in automotive fluid conveyance (EGR, fuel, exhaust) and benefits from Continental's global OEM relationships.
• Kadant Inc. US-listed industrial equipment supplier with components for process industries including flexible elements and engineered systems used in pulp/paper, metals, and energy. Adjacent to BOA's industrial end markets rather than a direct bellows competitor, but comparable in serving mission-critical fluid handling.

Emerging players

• KMC Corporation: South Korean manufacturer of metal bellows and automotive exhaust flexible pipes, with strong penetration into Korean OEMs (Hyundai/Kia). Compares to BOA in precision bellows for engine and exhaust systems, with a regional rather than global footprint.
• TOZEN Corporation: Japanese manufacturer of flexible joints, expansion joints, and metal hoses for industrial piping, building services, and machinery. Comparable to BOA's industrial division in product type and custom-engineered solution model, but primarily Japan-domestic and Asia-Pacific focused.
• AYVAZ: Turkish manufacturer of expansion joints, metal hoses, and flexible elements for HVAC, marine, power, and process industries. Comparable in industrial bellows and expansion joint manufacturing with a regional (EMEA) presence.

Regional players

• Duraflex, Inc. US-based manufacturer of metal hose and expansion joints for industrial, petrochemical, and power generation markets. Comparable to BOA's US facility (American BOA) in product category, but more concentrated in the North American industrial market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries5 records

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 BOA Group