Stromag

What Stromag does

Stromag, founded in 1932 in Dortmund as Stromschienen und Apparatebau GmbH and now headquartered in Unna, Germany, designs, manufactures, and sells mechanical power transmission components for industrial drivetrain applications. Its portfolio spans seven core product categories — industrial brakes (disc, drum, electromagnetic, eddy current, hydraulic, spring-applied, wind-turbine), clutches (multi-disc, single-disc, tooth, hydraulic/electric/pneumatic), combined 2in1 clutch-brake units, flexible couplings, geared cam limit switches, friction discs, and SIOT monitoring and control systems — supported by proprietary technology platforms including Periflex couplings (since 1939), Light Cam limit switches, and hydraulic marine clutches delivering up to 2.2 million Nm of torque. The company holds more than 400 trademark rights and over 40 valid patents accumulated over nine decades of continuous operation.

Stromag serves industrial OEMs and end-users across 14+ vertical markets, with primary focus on crane & hoist, elevator & escalator, marine, renewable energy (wind), oil & gas, metals, and farm & agriculture applications, plus secondary exposure to amusement rides, forklifts, gensets, electric motors, gear manufacturers, general machinery, stage technology, and off-highway equipment. Its go-to-market is a direct enterprise field-sales model, with 500+ sales personnel, 20 engineering and service centers, and 50+ manufacturing locations across 21+ countries, supplemented by distribution partners extending coverage to more than 70 countries. The company operates wholly-owned subsidiaries in Germany (Unna, Dessau), France (Stromag France S.A.S. / SIME Brakes), India (Pune), China (Shenzhen/Taicang), Korea, the United States, and Brazil, and is a wholly-owned brand within the Regal Rexnord group following Altra Industrial Motion's 2016 acquisition.

The business model is hardware sales of engineered, often custom-configured components sold on a quote basis to industrial customers, with revenue driven by OEM build cycles, aftermarket replacement, and project-based industrial installations. Stromag complements its mechanical portfolio with the SIOT digital monitoring platform (including SIMAN safety management), positioning the company for incremental recurring revenue from condition monitoring and predictive maintenance. The business is certified to ISO 9001, 14001, 45001, and 50001 standards and is led by Managing Directors Kerry Gahm and Ralph Arnold Breuer.

Name

Stromag

Legal name

Stromag GmbH

Website

https://stromag.com

Company type

Private

Founded year

1932

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Stromag, founded in 1932 and headquartered in Unna, Germany, manufactures industrial power transmission components—including brakes, clutches, couplings, limit switches, and IoT condition monitoring—for OEMs and end-users across crane, marine, wind energy, metals, and agricultural sectors globally as a brand within Regal Rexnord.

Ownership category

akta.pro rank

Product category

Industrial Power Transmission Components

NAICS

Mechanical Power Transmission Equipment Manufacturing (333613), Engine, Turbine, and Power Transmission Equipment Manufacturing (3336), Relay and Industrial Control Manufacturing (335314)

SIC

General Industrial Machinery & Equipment (3560), Oil & Gas Field Machinery & Equipment (3533), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Linear Motion & Mechanical Power Transmission (Ball/roller screws, linear guides, bearings, couplings) (IMAHAGAM)

Keywords

• Industrial brake systems
• Power transmission components
• Industrial clutches couplings
• Geared cam limit switches
• Condition monitoring solutions

Headquarters

HQ city

Unna

HQ country

Germany

HQ region

Europe

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Industrial Power Transmission Components: Design, manufacture, and sale of brakes, clutches, couplings, limit switches, and related components for industrial drivetrain applications. Products sold directly to industrial OEMs and end-users across multiple sectors including energy, off-highway, metals, marine, and material handling.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Stromag designs, manufactures, and sells industrial power transmission components — including brakes, clutches, couplings, geared cam limit switches, SIOT condition monitoring systems, and friction discs — for industrial drivetrain applications across sectors such as cranes and hoists, marine, offshore energy, metals, agriculture, wind energy, oil and gas, and off-highway equipment. The company's portfolio spans standard to custom-engineered solutions, supported by a global footprint of 21+ countries, 50+ manufacturing locations, and 20 engineering and service centers.

Product overview

Stromag is a globally recognized leader in power transmission components for industrial drivetrain applications, founded in 1932 and now part of Regal Rexnord. The company offers a comprehensive portfolio centered on seven core product categories: Brakes (industrial disc brakes, wind turbine brakes, emergency, service, storm, and specialty brakes), Clutches (multi-disc, single-disc, tooth clutches), 2in1 (combined clutch-brake solutions), Couplings (flexible couplings in various configurations), Geared Cam Limit Switches (precision position sensors), SIOT Monitoring and Control (Smart IoT condition monitoring with SIMAN and SIDEOS modules), and Friction Discs (sinter and steel variants). The product lineup serves diverse industrial markets including cranes and hoists, marine, offshore energy, metals, agriculture, forklifts, oil and gas, renewable energy, and general machinery. Recent innovation includes the KHE Clutch launched in December 2025 for forage harvester applications.

Differentiator

Problem solved

Functional benefit

Brands

• SIOT (Smart Industrial Internet of Things): Monitoring and control system for industrial applications including SIMAN safety management intelligent system
• Periflex

Products and services

• Industrial Brakes Industrial disc brakes and wind turbine brakes including emergency, service, storm, buffer, electromagnetic, hydraulic, eddy current, multi-disc, spring-applied, drum, rail, and wheel brakes for use in cranes, hoists, marine vessels, offshore platforms, steel mills, and general industrial machinery. Sold to industrial OEMs and end-users.
• Industrial Clutches Industrial power transmission clutches including multi-disc clutches, single-disc clutches, and tooth clutches in electric, hydraulic, and pneumatic actuation variants, used by OEMs in drivetrain applications across marine, agriculture, metals, and general machinery.
• 2in1 Combined Clutch and Brake Units Combined clutch and brake solutions delivered as a single integrated unit, available in electric, hydraulic, and pneumatic configurations for compact drivetrain applications. Sold to industrial OEMs in agriculture, off-highway, and gearbox integration use cases.
• Industrial Couplings Flexible power transmission couplings including disc drum, driveshaft, rubber fabric, tyre, high torsional, medium torsional, external bearing, internal bearing, and ring couplings for torque transmission, misalignment compensation, and vibration damping in industrial drivetrains. Sold to industrial OEMs and gearbox, diesel genset, and electric motor manufacturers.
• Geared Cam Limit Switches Precision geared cam limit switches including the Series 51, Series Light Cam, Light Cam Compact, Series 100/110, Series HGE/HEG, LightXCross LX, and Series 62 product families with proprietary encoder capability. Used by OEMs for position sensing and control in industrial applications including wind turbine pitch and yaw systems, cranes, and stage rigging.
• SIOT Monitoring and Control System Smart Industrial IoT monitoring and control system comprising SIMAN safety management and SIDEOS condition control modules, used for predictive maintenance, brake opening/closing piloting, and operational fault indication/recording on industrial brakes and drivetrain assets. Sold to industrial operators seeking condition monitoring overlay on Stromag braking systems.
• Friction Discs Sinter friction discs (50–680mm diameter) and steel friction discs (40–1200mm diameter) supplied as consumable and OEM-fit components used inside Stromag and third-party industrial clutches and brakes across marine, agriculture, metals, and general industrial markets.
• KHE Dry Hydraulic Clutch for Forage Harvesters Economical dry hydraulic clutch designed for self-propelled forage harvesters. Features dry hydraulic design with sinter pads, 8200 Nm maximum torque at 28 bar operating pressure, and dust expulsion architecture for harsh agricultural environments. A simplified variant of the established KHM clutch aimed at agricultural equipment OEMs.
• PHS Hydraulic Buffers Hydraulic buffers used on cranes to absorb high kinetic energy, available with optional safety chain, protection cover, and customized paint configurations. Sold to crane OEMs, steel mill operators, and port crane end-users.
• SAB Drum Brake AISE compliant spring-applied, electrohydraulic thrustor-released safety drum brake with automatic wear compensation for constant torque output. Used for safety braking in steel mill and metals industry applications.

Quantifiable outcome

• KHE clutch achieved approximately 20% cost savings for agricultural equipment OEM
• +1 more outcomes

Named customers3 records

Segments15 records

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Regal Rexnord (formerly Altra Industrial Motion)coreOthers · 1 January 2016Parent company. Altra Industrial Motion Corp. acquired Stromag in 2016, and subsequently merged with Regal Rexnord. Stromag operates as a brand within the Regal Rexnord family of industrial motion companies.

Scale indicators9 records

Recent moves11 records

Expansion highlights5 records

Direct peers

• Wichita Clutch: Sister brand under Regal Rexnord specializing in industrial clutches and brakes for heavy-duty applications. Most direct product overlap with Stromag across pneumatic/hydraulic clutches and industrial brakes.
• Svendborg Brakes: Sister brand under Regal Rexnord focused on industrial disc and drum brakes for mining, marine, and wind. Strong overlap with Stromag's brake portfolio, particularly in mining and offshore wind.
• Twiflex: Sister brand under Regal Rexnord producing caliper and disc brakes for industrial applications, including cranes, winches, and elevators. Direct brake product-line overlap with Stromag.
• TB Wood's: Sister brand under Regal Rexnord manufacturing mechanical power transmission products including couplings and clutches. Provides U.S. market reach for coupling products alongside Stromag.
• Ameridrives: Sister brand under Regal Rexnord producing disc, universal-joint, and gear couplings for industrial applications. Direct product overlap with Stromag's coupling portfolio.
• Warner Electric: Sister brand under Regal Rexnord focused on electromagnetic clutches and brakes. Direct product and technology overlap with Stromag's clutch and brake lines.
• KTR Systems: German-headquartered manufacturer of power transmission couplings (jaw, gear, disc, torsionally flexible). Most direct independent competitor to Stromag in industrial couplings, especially in EMEA.
• R+W Coupling Technology: German precision-coupling manufacturer specializing in flexible and servo couplings for industrial machinery. Direct competitor in torsionally flexible couplings for motors and gearboxes.

Broad incumbents

• Bosch Rexroth: Large German industrial conglomerate with a substantial hydraulic and mechanical power transmission portfolio, including industrial brakes and couplings. Competes with Stromag especially in hydraulics-driven motion control.
• Parker Hannifin: Global motion and control technologies leader with industrial clutch, brake, and coupling offerings alongside broader aerospace and hydraulics. Competes with Stromag across multiple industrial segments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCkfqZHN1Amu1AxB7eOnzYlw
• Facebookfacebook.com/altramotion
• LinkedInlinkedin.com/company/stromag-gmbh
• Xx.com/altramotion

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries7 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 Stromag