What Siebenhaar Antriebstechnik does

Siebenhaar Antriebstechnik GmbH is a privately held German specialty manufacturer of planetary gear systems and engineered winches, founded in 1965 and headquartered in Hofgeismar, Germany. The company designs and produces six core product lines — winch gears (Windeneinbaugetriebe), hoist and free-fall winches (Hub- und Freifallwinden, 2 to 350 tons capacity), slewing gears, wheel drives, spring-loaded multi-disc safety brakes (over 5,000 configurations, 38 Nm to 500,000 Nm braking torque), and custom special gears — all built on a modular "Baukastensystem" platform that enables engineered-to-order configurations for heavy-duty applications. Differentiated technologies include hydraulic-free active heave compensation with energy recovery for offshore winches and a world-unique switchable hydrostatic wheel gearbox for independent wheel suspensions.

The company serves enterprise OEM customers in four primary verticals: mobile and tower cranes, marine and offshore systems, mining and excavation machinery, and specialized industrial applications. Disclosed customers include Jan de Nul Group (offshore dredging), Huisman Equipment (offshore cranes up to 10,000-ton line-pull, 25+ year relationship), WOLFFKRAN (tower cranes including Kingdom Tower Saudi Arabia at 1,007 meters), Tadano Faun (ATF 600G-8 600-ton mobile crane), SENNEBOGEN (rope excavators), and Van Haagen Kraanbouw (1,400-ton gantry crane in Szczecin). The company holds ISO 9001:2015 certification and type/individual approvals from DNV-GL, ABS, Lloyd's Register, and CCS for marine and offshore market access.

Revenue is generated through project-based, engineered-to-order hardware sales (one-time license model) supplemented by spare parts, repair, maintenance, diagnostics, and engineering services. Pricing is custom and not publicly disclosed. Distribution is direct enterprise sales with technical consulting, supported by regular trade fair presence at Bauma Munich, Europort Rotterdam, Hannover Messe, CTT Moscow, and Offshore Energy Amsterdam. The company is family-owned, controlled by Managing Director Dr. Jamshid Yektai since 1989, with no venture capital or institutional investor ownership.

Name

Siebenhaar Antriebstechnik

Legal name

Siebenhaar Antriebstechnik GmbH

Website

https://siebenhaar-antriebstechnik.de

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

101–250 employees

Short description

Siebenhaar Antriebstechnik is a German manufacturer of custom-engineered planetary gears, winches, slewing gears, and safety brakes serving enterprise OEMs in mobile/tower cranes, marine and offshore, mining, and heavy construction equipment sectors.

Ownership category

akta.pro rank

Product category

Industrial Gearboxes and Winches

NAICS

Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing (333612), Other General Purpose Machinery Manufacturing (3339)

SIC

Construction Machinery & Equip (3531), Special Industry Machinery, Nec (3559)

akta.pro primary industry

Winches & Capstans (IMAHAJAH)

akta.pro secondary industries

Gearmotors, Gearboxes & Speed Reducers (IMAGACAF), Deck Machinery & Mooring Systems (Winches, Windlasses, Capstans) (IMAJAIAA)

Keywords

• Planetary gearboxes
• Winch systems
• Slewing gear units
• Safety brakes
• Industrial drive technology

Headquarters

HQ city

Hofgeismar

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom gear and winch manufacturing: One-time hardware sales of custom-engineered planetary gears, winches, and drive systems. Products are designed and manufactured to customer specifications ('engineering to order'). Revenue derived from project-based orders for construction machinery, marine/offshore, and industrial applications.
2. Spare parts and aftermarket service: Original Siebenhaar spare parts, repair, maintenance, diagnostics, performance testing, oil analysis, and training services. Field service available domestically and internationally.
3. Engineering and design services: Custom engineering, redesign, scheduled maintenance, and repair of gears and components. Services accompanied by engineers in design, manufacturing and project management.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Siebenhaar Antriebstechnik manufactures planetary gearboxes, winches, slewing gears, belt drums, and safety brakes for OEM customers in the construction machinery, marine/offshore, mining, and crane industries. Products are engineered to customer specification using a modular building-kit system (Baukastensystem) that allows rapid custom configuration of standard platforms, with world-unique offerings such as a free-fall winch with active heave compensation.

Product overview

Siebenhaar Antriebstechnik is a specialized manufacturer of planetary gears and winches founded in 1965, based in Hofgeismar, Germany. The product portfolio consists of six core product lines built on a modular system approach: Windeneinbaugetriebe (winch gears) are compact planetary gearboxes integrated into cable drums; Hub- und Freifallwinden (hoist and free-fall winches) are complete winch systems from 2-350 tons capacity; Dreh- und Schwenkwerksgetriebe (slewing gears) handle rotation and swing functions; Fahrgetriebe (wheel drives) power tracked vehicles and excavators; Sicherheitsbremsen (safety brakes) provide holding and emergency braking; and Sondergetriebe (special gears) are custom solutions for unique applications. Products are designed for heavy-duty applications in construction, mining, offshore, and marine industries, with a modular component system allowing economical customization. The company holds ISO 9001:2015 certification and produces products accepted by classification societies including ABS, DNV GL, and Lloyd's Register.

Differentiator

Problem solved

Functional benefit

Products and services

• Planetary Gears (PLG series) Modular planetary gearboxes built on a standardized component platform for OEM integration into construction machinery, cranes, marine/offshore equipment, and mining machinery. Configurable to customer torque, ratio, and mounting requirements.
• Winches (WSP series) Industrial winches engineered for marine/offshore and heavy-duty applications, including free-fall winches with active heave compensation for offshore load handling, used by OEMs building cranes and offshore equipment.
• Slewing Gears (DLG series) Slewing gear units that provide controlled rotational drive for cranes, excavators, and other rotating platforms, integrating with Siebenhaar's modular planetary gear platform.
• Belt Drums Belt drum drive components designed for conveyor and bulk-material handling applications, used by OEMs in mining and bulk-handling equipment.
• Safety Brakes Safety brakes designed to integrate with Siebenhaar's gearboxes and winches, providing holding, dynamic, and emergency braking functions for cranes, winches, and rotating machinery.

Quantifiable outcome

• More than 3,000 cranes equipped annually
• +4 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• Huisman Equipment B.V.coreStrategic or Co-development PartnerReference customer for over 25 years in lifting, drilling and subsea solutions. Uses Siebenhaar planetary gears and winches in cranes with up to 10,000 ton line-pull. Deep collaborative relationship in developing solutions for challenging lifting and drilling projects.
• Forschungsvereinigung Antriebstechnik e.V.minorStrategic or Co-development PartnerResearch Association for Drive Technology membership. Integrates latest industry knowledge into product development as a member company.
• DNV GLcoreOthersClassification society providing type and individual approvals for Siebenhaar products. Essential for marine/offshore sector market access.
• ABS (American Bureau of Shipping)coreOthersClassification society providing type and individual approvals for marine products.
• Lloyd's RegistercoreOthersClassification society providing type and individual approvals for marine products.
• CCS (China Classification Society)minorOthersClassification society providing type and individual approvals.
• Van Haagen KraanbouwcoreStrategic or Co-development PartnerCustomer for the largest gantry crane in Europe. Siebenhaar developed and built complete winch system for crane with 1,400 ton lifting capacity.

Scale indicators5 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• TWG (Tulsa Winch Group): US-based manufacturer of hydraulic and electric winches for crane, marine, oilfield and specialty vehicle applications — a direct competitor in the heavy-duty industrial winch segment.
• Pfaff-silberblau: German manufacturer of industrial winches, hoists and crane components, with a similar Mittelstand profile and product overlap in lifting and hoisting winch systems serving crane OEMs and industrial users.
• Bonfiglioli: Italian manufacturer of planetary gearboxes, gearmotors and drive systems for cranes, marine, construction machinery and wind energy — directly comparable in planetary gear technology and target applications.
• Brevini Riduttori (Dana Incorporated): Italian heritage planetary gearbox and winch drive manufacturer (now part of Dana) serving cranes, marine winches, and offshore equipment — a direct competitor in planetary gears for heavy-duty applications.
• Rotzler: German specialist manufacturer of winches and hoists for mobile cranes, crawler cranes and heavy lifting equipment — directly comparable in product focus and customer base to Siebenhaar's crane segment.

Broad incumbents

• SEW-Eurodrive: German manufacturer of drive technology including industrial gearboxes and motors serving crane, marine and materials handling applications — a broader incumbent in industrial drive systems.
• Flender (Siemens): German manufacturer of mechanical drive systems (now part of Siemens) including planetary gearboxes for cranes, winches and heavy industry — directly competing in planetary gear technology with broader scale and global reach.
• Demag Cranes (Terex): German-origin crane manufacturer (now Terex) producing industrial cranes with internally developed drive and winch systems — comparable end-market exposure in cranes with vertically integrated component manufacturing.
• ZPMC: Chinese state-owned port machinery and crane manufacturer with internal winch and planetary gear production for ship-to-shore cranes, gantry cranes and offshore applications — broader incumbent with vertically integrated gear manufacturing.
• Bosch Rexroth (Hägglunds Drives): Global drive and motion technology leader offering Hägglunds hydraulic motors, gearboxes and winch drive systems for marine, offshore and crane applications — broader portfolio but overlapping in drive technology for heavy machinery.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/Siebenhaar-Antriebstechnik-GmbH-111516188008310

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Siebenhaar Antriebstechnik