Clamping Solutions
Explore HENNLICH’s range of industrial clamping solutions - segment screw clamps, Wulst screw clamps, DIN 28152 clamps, cap-nut, wing nut, toggle nut, and surface-treated clamps. Trusted by process industries across India
Vivek Sawala
National Sales Manager
What is Clamping Technology?
Clamping technology refers to engineered fastening systems - including screw clamps, fixtures, and specialized nuts - designed to create secure, leak-proof, and maintenance-friendly connections between flanged components in high-pressure and high-temperature industrial environments. These solutions are critical wherever reliable sealing and structural integrity cannot be compromised.
What is WGR Rathmann in Clamping Technology?
WGR Rathmann is a leading German manufacturer with over 60 years of dedicated expertise in the development and production of industrial clamping technology. The company specialises in precision-engineered screw clamps, segment clamping bolts, pressure vessel clamps, and fastening accessories built to meet the most demanding process industry requirements. Certified according to Directive 2014/68/EU
WGR Rathmann products comply with internationally recognized standards, including AD2000 & ASME, ensuring that every component delivers consistent performance under extreme operating conditions. Their manufacturing ethos centre on precision, durability, and safety-qualities that establish WGR Rathmann as a trusted name in applications where critical bolted connections are essential.
HENNLICH has maintained a strong partnership with WGR Rathmann for 39 years, giving Indian customers direct access to this German engineering heritage with local technical support and expert application guidance.
Certification according to DIN EN 10204-3.1 and DIN EN 10204-3.2 is possible.
Variants / Types of Clamping Technology
HENNLICH supplies the complete WGR Rathmann range of clamping solutions, covering a broad spectrum of industrial requirements.
- Segment Screw Clamps
- Wulst Screw Clamps
- DIN 28152 Screw Clamps
- Accessories — Nuts and Fixtures
- Cap-nut
- 6kt nut (Hexagonal nut)
- Wing nut
- Toggle nut
- Fixtures
Development and construction of Clamps for special applications, as well as assistance from our experts.
Surface Treatment
All clamping solutions are available with a range of surface treatments to match the application's environmental conditions. Surface-treated clamps and fasteners offer enhanced protection against corrosion, chemical attack, and mechanical wear, extending service life in aggressive atmospheres such as those found in offshore, chemical, and marine environments. Common treatments include zinc plating, hot-dip galvanizing, and specialized coatings.
Application of Clamping Technology
HENNLICH clamping solutions serve critical functions across a wide range of process and manufacturing industries:
- Pressure vessel clamps: Securing flanged joints on pressure vessels operating under elevated pressure and temperature conditions, where joint integrity is a safety-critical requirement.
- Tank clamps: Connecting manhole covers, nozzle flanges, and inspection ports on industrial storage tanks, process tanks, and mixing vessels, including surface-treated clamps for corrosive storage media.
- Chemical and petrochemical processing: Providing reliable, maintenance-friendly connections on pipelines, reactors, and heat exchangers in environments with aggressive media.
- Oil and gas installations: Delivering certified, high-integrity clamping connections for upstream and downstream equipment where failure is not an option.
- Pharmaceutical and food processing: Meeting hygiene and cleanability standards while ensuring leak-free connections on processing equipment.
- Power generation: Securing flanged systems in boilers, turbines, and auxiliary equipment subjected to cyclic thermal and mechanical loading.
- Industrial manufacturing: Offering versatile clamping solutions for fixtures, machine frames, and production equipment requiring frequent reconfiguration
Advantages of Clamping Technology
Choosing the right clamping solution delivers measurable benefits across the entire asset lifecycle:
- Rapid installation and dismantling: Screw clamp designs allow flanged connections to be assembled and disassembled significantly faster than conventional bolted flanges, reducing maintenance downtime.
- Uniform load distribution: The multi-segment and profiled designs of segment and Wulst clamps spread clamping force evenly across the flange face, minimising the risk of localised stress and gasket damage.
- High pressure and temperature resistance: WGR Rathmann clamps are engineered to AD2000 and ASME standards, ensuring reliable performance under the demanding conditions of industrial process environments.
- Corrosion protection through surface treatment: Surface-treated clamps and fasteners extend service life in aggressive or outdoor environments, reducing the total cost of ownership.
- Standardised interchangeability: DIN 28152 screw clamps conform to recognised dimensional standards, simplifying procurement and ensuring compatibility across equipment generations.
- Versatile fastening accessories: The availability of cap-nut, 6kt nut, wing nut, toggle nut, and purpose-made fixtures within a single supply programme simplifies procurement and ensures component compatibility.
- Safety-critical reliability: Compliance with international standards and precision German manufacturing gives plant operators confidence in the integrity of every bolted connection.
- Firmly connected to the vessel (no loss of nuts, bolts, etc.)
- Reusability and Long Service Life
About HENNLICH
HENNLICH is an internationally active industrial supplier with a strong presence across Europe and Asia. In India, HENNLICH Private Limited operates from Pune, Maharashtra, serving customers across diverse process and manufacturing industries with specialised technical solutions.
HENNLICH’s approach goes beyond product supply. The company provides expert technical consultation, helping customers select the correct clamping technology for each application, understand load and pressure requirements, and identify the appropriate surface treatment for their operating environment. This application-driven approach, combined with 39 years of direct partnership with WGR Rathmann, means customers benefit from a depth of product knowledge that general distributors cannot match.
HENNLICH India’s product portfolio spans clamping solutions, sealing technology, lubrication technology, hydraulic components, springs and machine elements, cooling and heating systems, and engineering solutions - making HENNLICH a reliable single-source partner for critical industrial components.
Frequently Asked Questions (FAQs)
Segment screw clamps use a multi-segment design to grip standard flanges with even clamping force, making them suitable for a wide range of pipe and vessel flanges. Wulst screw clamps are specifically engineered for bead-edged (Wulst) flanges, using the bead profile to achieve a self-energising seal. The right choice depends on the flange geometry of your equipment.
DIN 28152 screw clamps are dimensioned to match the standardised flange geometry defined by the DIN 28152 standard, which is widely used in vessel and apparatus construction across Europe. They are compatible with equipment designed to this standard. For flanges designed to other standards, segment or Wulst screw clamps may be more appropriate — HENNLICH’s technical team can advise on the correct selection.
HENNLICH supplies surface-treated clamps and fasteners with finishes including zinc plating, hot-dip galvanising, and chemical-resistant coatings. The choice of surface treatment depends on the operating environment, exposure to corrosive media, and the required service life. Our technical team can recommend the correct treatment for your application.
A cap nut is a closed-end fastener that protects thread ends and provides a neat finish. A wing nut can be tightened and loosened by hand without tools, making it ideal for frequently accessed connections. A toggle nut is used where access is restricted — it is inserted through a narrow opening and rotates into a locking position. Each serves a distinct role in a clamping assembly.
Yes. Pressure vessel clamps and tank clamps are core application areas for WGR Rathmann clamping technology. These products are manufactured to AD2000 and ASME standards and are designed for safe, reliable operation under the pressure and temperature conditions typical of industrial pressure vessels and process tanks.
The correct clamping solution depends on several factors: the flange standard and geometry, operating pressure and temperature, the media being handled, the environmental conditions, and the frequency of maintenance access required. HENNLICH’s technical team provides application-specific guidance to ensure the correct product selection. Contact us directly for a consultation.
Yes. HENNLICH supplies the complete accessory programme alongside the main clamp range, including cap-nut, 6kt nut, wing nut, toggle nut, and installation fixtures. This ensures full system compatibility and simplifies procurement for customers who need a complete bolted connection solution from a single supplier.
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