Hammerwerk Erft

What Hammerwerk Erft does

Hammerwerk Erft G. Diederichs GmbH & Co. KG is a privately held, family-owned German open-die forge headquartered in Bad Münstereifel-Arloff, North Rhine-Westphalia, producing custom-forged metal components for the highest industrial demands since commencing production in 1951. The company's portfolio spans seamless rolled rings (up to 2,800 mm outer diameter), forged rings, shaped shafts, forged bars, hollow forged parts, discs and punched discs, and die-forgings, with unit weights ranging from approximately 15 kg to 28,000 kg. Manufacturing is anchored by 12–35 MN forging presses, steam hammers (400–3,000 kg ram weight), two ring rolling mills with radial-axial rolling, process-controlled forging furnaces up to 250 tonnes capacity, in-house heat treatment, and CNC/conventional machining — all operated under one roof on a single Bad Münstereifel site, supported by 15+ quality specialists (several DIN EN ISO 9712 Level 3 certified).

The customer base is diversified across seven industrial verticals: gear manufacturing, wind power, fittings/valves, shipbuilding, power generation, heavy machinery, and defence. Revenue is generated entirely through quote-based, one-time sales of bespoke forgings under EXW (ex-works) terms with 30-day payment terms, with separate contract forging (customer-supplied material) and an express service for urgent orders. Pricing is determined per order by weight or piece count, with no public price list. Distribution is exclusively direct: a German domestic sales team structured by postal code, an export sales team focused on Western European neighbors and growing international markets, and a commercial agent network (e.g., NSC Çelik in Turkey).

Access to global customers — particularly in marine, offshore, and pressure-equipment applications — is underpinned by an unusually broad certification portfolio, including ISO 9001/14001/50001 and approvals from DNV, ABS, Bureau Veritas, ClassNK, Lloyd's Register, RINA, Korean Register, TÜV (2014/68/EU and AD2000-Merkblatt W0), Türk Loydu, and TPG. The firm employs ~270 people across production, technology, and commercial functions, runs an apprenticeship program across nine trades, and uses nearly 100% recycled steel as raw material, positioning it favorably for sustainability-minded industrial buyers.

Name

Hammerwerk Erft

Legal name

Hammerwerk Erft G. Diederichs GmbH & Co. KG

Website

https://hammerwerk-erft.de

Company type

Private

Founded year

1950

Operating status

Operating

Headcount range

251–500 employees

Short description

Hammerwerk Erft is a family-owned German open-die forge producing custom large-scale forgings (rolled rings, shafts, discs, bars, hollow parts) up to 28,000 kg for industrial customers in wind power, shipbuilding, power generation, heavy machinery, gears, fittings, and defence markets.

Ownership category

akta.pro rank

Headquarters

HQ city

Bad Münstereifel

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Forged Components: One-time sale of custom metal forgings — from raw forging to ready-to-install finished components. Products include seamless rolled rings, forged rings, shaped shafts, forged bars, hollow forged parts, discs and punched discs, and die-forgings. Contract forging services (customer-supplied material) are also offered. Revenue is derived entirely from the sale of bespoke industrial forgings to engineering and manufacturing customers across multiple industries.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Hammerwerk Erft is an open-die forge producing custom industrial forgings — including seamless rolled rings, forged rings, shaped shafts, forged bars, hollow forged parts, discs and punched discs, and die-forgings — ranging from approximately 15 kg to 28,000 kg unit weight. Operations are vertically integrated, combining forging presses (12–35 MN), a steam hammer mill, ring rolling mills, in-house heat treatment, CNC and conventional machining, and in-house material testing under one roof at the Bad Münstereifel-Arloff site.

Product overview

Hammerwerk Erft is an open-die forge with over 400 years of experience offering a comprehensive portfolio of forgings and manufacturing services. The company's core products include Seamless rolled rings, Forged rings, Shaped shafts, Forged bars, Hollow forged parts, Discs & Punched discs, and Die-forgings. These are supported by in-house manufacturing capabilities including Forging presses (up to 35 MN), Hammer mill, Ring rolling mill, Heat treatment, Machine shop, Material testing, and Quality assurance. The company also offers contract forging and express service for urgent requirements. Materials processed include unalloyed and low-alloy steels, case-hardening steels, quenched and tempered steel, nitriding steels, tool steels, rolling bearing steels, heat resistant steels, rust-, acid- and heat-resistant steels, austenite, duplex steels, and martensite. Products serve industries including gear manufacturing, wind power, fittings, shipbuilding, power generation, heavy machinery, and defence.

Differentiator

Problem solved

Functional benefit

Products and services

• Seamless rolled rings Seamless rolled rings produced on two ring rolling mills with outer diameter approximately 250 to 2,800 mm, height approximately 45 to 700 mm, and unit weight approximately 15 to 4,000 kg. Supplied to industrial manufacturers for gear, power generation, marine, fittings, and heavy machinery applications.
• Forged rings Forged rings supplied up to approximately 2,500 mm diameter in a unit weight range of approximately 700 to 18,000 kg, for industrial applications including flanges, gear components, and heavy engineering.
• Shaped shafts Open-die forged shaped shafts from approximately 20 to 20,000 kg unit weight, with flanged shaft capability up to maximum flange diameter of approximately 1,800 mm. Used in power transmission, marine propulsion, and heavy machinery.
• Forged bars Forged bars from approximately 20 to 20,000 kg unit weight with round, square, or rectangular cross-section up to approximately 1,000 mm thickness.
• Hollow forged parts Hollow forged parts up to approximately 18,000 kg unit weight and approximately 3,000 mm length, for pressure equipment, cylinders, and large mechanical components.
• Discs & punched discs Three-dimensional forged discs, punched discs, hub discs, double hub discs, and trunnions in a unit weight range of approximately 20 to 18,000 kg.
• Die-forgings Die-forgings produced using auxiliary dies and forging tools, either from existing stock or newly produced to customer specification, including geometries such as journals, hub discs, and double hub discs with fiber-conforming low machining allowances.
• Contract forging Contract forging service combining the company's modern forging technology with decades of experience, handling the entire forming process including process design, forging, and heat treatment of customer-supplied material including high-alloy steels, austenitic steels, nickel-based alloys, and copper.
• Express service Express service for urgent customer requirements, leveraging efficient decision-making and flexible production planning to meet extraordinary deadline requests for standard or custom forgings.

Quantifiable outcome

• Near 100% recycled steel usage, contributing to sustainable manufacturing
• +1 more outcomes

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• NSC ÇELIK Dış Tic.Paz.San. ve Tic.Ltd.Şti.minorChannel Partner/ Reseller/ DistributorNSC ÇELIK serves as a commercial agent for Hammerwerk Erft in Turkey, operating from Istanbul (Zeytinburnu). The agency handles sales facilitation and customer relationships for Hammerwerk Erft in the Turkish market, operating under the name NSC Çelik Dis Tic.Paz.San. ve Tic.Ltd.Şti. Contact is available via phone and email through the company's sales representative page.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Sheffield Forgemasters: UK-based large open-die forge (now MoD-owned) producing heavy forgings for defence, nuclear, and power generation. Comparable in large-component capability, defence end-market exposure, and high certification/quality barrier to entry.
• Ellwood Group: US-based open-die forge and iron foundry producing large custom forgings for defence, marine, and heavy industry. Comparable in serving defence/naval markets with class-approved large forgings and integrated heat treatment.
• Buderus Edelstahl: German specialty steel producer and forger producing open-die forgings for automotive, machinery, and energy markets. Comparable in mid-sized German industrial forging operations and integrated steel-to-forging model.
• Scot Forge: US-based open-die and rolled-ring forger producing large custom forgings for defence, power generation, and industrial markets. Comparable in open-die scale capability, vertical integration, and classification/certification-driven customer access.
• Leiber Group: German family-owned open-die forge producing custom forgings and seamless rolled rings for similar industrial markets. Comparable in scale (mid-sized, hundreds of employees), vertical integration, and customer base across machinery, marine, and energy sectors.
• FOMAS Group: Italian open-die and ring-rolled forging group serving wind, oil & gas, and heavy machinery markets. Directly comparable in large-component capability, classification approvals, and focus on renewable energy forgings.
• Ovako: Swedish specialty steel producer and open-die forger serving wind, heavy machinery, and industrial customers with similar large-dimension forged components. Closely comparable in product portfolio (rolled rings, bars, forgings), end-market mix, and European footprint.

Broad incumbents

• Voestalpine: Austrian integrated steel and technology group with a Special Steel division producing open-die forgings and rolled rings for energy, aerospace, and industrial markets. Comparable at the category level as a larger incumbent in large-component European forging.
• Saarschmiede / Dillinger: German heavy steel plate and forging producer (Saarschmiede is the forging arm of Dillinger). Comparable as a broader incumbent producing large forgings for energy, marine, and heavy industry, with overlapping capability in heavy custom components.

Others

• Andritz: Austrian plant and equipment supplier for hydropower and other process industries, sourcing large forged components (rings, shafts) similar to those Hammerwerk Erft produces. Relevant as an adjacent customer/ecosystem participant in the hydropower value chain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@HammerwerkErft-Web
• Facebookfacebook.com/HammerwerkErft
• LinkedInlinkedin.com/company/hammerwerk-erft

Compliance15 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Hammerwerk Erft