Frequently Asked Questions About Our Bolting Tools

Tightening refers to the process in which a bolt is tightened to a specified torque.
Tensioning is the result of this process – namely the clamping force generated between the connected components that keeps them securely joined.

In torque-controlled bolting technology, the bolt is tightened by applying a defined torque, which generates the preload (clamping force) through rotational movement.

In tensioning bolting technology, the bolt is first axially preloaded (tensioned), after which only a small retaining torque is applied. This method enables highly precise and reproducible preload (clamping force).

A torque wrench applies bolts with a controlled and precisely adjustable torque — ideal when precision and repeatability are critical.

An impact wrench, by contrast, operates with hammering impulses and high torque, making it better suited for quickly loosening or tightening stubborn bolts. It is therefore not suitable for torque-controlled precision tightening.

Controlled bolting refers to tightening a bolted joint using a defined torque under monitored conditions. The objective is to achieve a consistent preload in order to ensure a reliable and reproducible connection. This process utilizes tools equipped with measurement or automatic shut-off functions to prevent over-tightening or under-tightening.

A flange joint is secured correctly when all components are clean, the bolts are lightly lubricated, and the tightening process is carried out in a crosswise and incremental sequence using the specified torque. For precise and repeatable results, we recommend using Plarad torque tools or hydraulic bolting systems.

Hydraulic and electric torque tools are particularly suitable for wind turbines, supplemented by modern digital control and, where necessary, automated systems to ensure safety, accuracy, and efficiency in the wide range of bolting tasks.

For bolted joints in hard-to-access areas, we recommend the Plarad Hydraulic Torque Wrench FSX. Its flat, lightweight and compact design allows reliable use in highly sensitive, low-clearance and hard-to-reach applications.

For mobile use on construction sites, PLARAD’s Battery Nuttunners and Electric Nuttunners are particularly suitable, as they can be operated without the need for complex infrastructure.

Yes — Plarad provides ATEX-certified tools for use in potentially explosive atmospheres. This includes hydraulic power packs, hydraulic torque wrenches, and pneumatic nutrunners, all specifically designed and approved for safe operation in ATEX zones.

Battery nutrunners run on battery power, are flexible and can be used mobilly – ideal for assembly and service work.

Electric nutrunners are operated via a power supply, offer high precision and documentation functions – suitable for industrial assembly.

Hydraulic torque wrenches operate using hydraulic pressure, deliver very high torque and are optimal for large-dimension bolted connections.

A manual torque multiplier is used when high torque is required without electricity or compressed air — for example in robust industrial bolting applications — and when a simple, reliable solution is desired.

The DA2 is a battery nutrunner with adjustable torque and rotation-angle mode as well as optional documentation — ideal for flexible, mobile use.

A hydraulic system operates with pressure and a hydraulic power pack, delivers higher torques, and is used for large bolting applications.

The collaboration with C. & E. Fein combines Plarad’s bolting technology expertise with Fein’s advanced drive systems competence. This synergy results in exceptionally powerful, precise, and durable tools designed for demanding industrial applications.

Plarad stands out with more than 60 years of experience, top-tier “Made in Germany” quality, and one of the industry’s broadest portfolios of bolting and tensioning systems. In addition to standard solutions, Plarad provides customized tools, innovative documentation capabilities, and comprehensive one-stop services. The result is exceptionally powerful, precise, and durable tools designed for demanding industrial applications.

Ergonomically engineered tools featuring two-hand operation and the Safety Start Trigger (SST) (e.g., the DA2 Safety Series), combined with a certified training and documentation system, significantly enhance operational safety during bolting processes.

The tools from Plarad are ergonomically optimised: They are lightweight, vibration-reduced and compact, thereby significantly reducing physical strain. Flexible swivel handles, well-balanced housings and cordless models enable comfortable and safe operation – even in highly-sensitive, low-clearance and hard-to-access areas.

Our bolting tools achieve a repeatability of below 4 % and, thanks to advanced control and measurement mechanisms, ensure reliable bolting connections.

Yes — we offer on-site demonstrations and consultations. Our bolting specialist will come to your facility, present our tools under real-world conditions, and provide you with a customized consultation to identify the optimal solution for your bolting applications.

Yes, we offer customised training programmes for operators and service personnel. Within the Plarad Academy, we provide application-oriented training focusing on safe and efficient bolting operations, including the correct use of torque and tensioning technology as well as hydraulic bolting tools. Training sessions can be conducted at our training facilities or directly on-site at the customer’s location.

To receive a customised quotation, simply submit your request via the contact form on our website – please include details about your application, required quantities and technical specifications. We will then prepare a tailored quote for you. If you would like individual consultation, feel free to contact us via the contact form as well, or find the appropriate regional contact person on our “Contact” page.

You can find the appropriate contact person directly on our website in the Contact section. There, all sales regions in Germany as well as our international distributors and service centres are presented clearly – so you can quickly reach the right contact for your region.

Plarad tools ensure a high level of operational safety through ergonomic design, low-vibration construction, and advanced features such as two hand operation and torque monitoring. This significantly reduces the risk of operating errors and workplace injuries during bolting applications.

Injuries caused by reaction torque can be prevented by properly supporting the tool and maintaining secure two-handed control during operation. Plarad tools are equipped with dedicated reaction arms and integrated safety features that absorb and transfer reaction torque in a controlled manner, ensuring safe and reliable operation.

Plarad supports ergonomic operation with heavy bolting tools by providing compact, low-vibration models and practical accessories such as trolleys for back-friendly transport.

The CE marking on our Plarad tools certifies that they comply with all applicable EU directives and regulatory requirements. It signifies conformity with stringent safety, health, and environmental protection standards and confirms that our products are safe for operation and may be placed on the market and freely used throughout the European Union.

Yes – at Plarad, a range of adapter and accessory solutions are available to help you flexibly handle a variety of bolting applications – for example, when dealing with varying fastener sizes, different preload requirements, or challenging installation spaces.

Plarad designs and manufactures tools, adapters, and complete bolting systems tailored precisely to the specific requirements and applications of our customers.