A torque multiplier is a tool that multiplies the torque applied with a wrench.
In addition to loosening or tightening large nuts with less effort, this essential tool allows you to work safely and precisely in applications that require controlled force.
In this article, we explain what it is, what it is used for, and the most common types.
What Is A Torque Multiplier?
A torque multiplier is a tool consisting of internal gears that transform a moderate input force into a much higher output force.
The main function is to enable an operator to apply high torque to a fastener with minimal effort.
It is used, for example, to loosen high-strength nuts on heavy vehicles, agricultural machinery, or industrial structures.
It is particularly useful in hard-to-reach places or when pneumatic or electric tools cannot be used.
What Does A Torque Multiplier Do?
The main purpose of a torque multiplier is to increase torque in a controlled and safe manner. With it, you can:
- Loosen nuts with excessive torque (for example, with a truck wheel spanner with torque multiplier);
- Apply precise tightening without damaging threads;
- Avoid the use of long extensions or excessive manual force;
- Simplify work in confined spaces or uncomfortable positions.
It is an indispensable tool for anyone who works with heavy vehicles, transmission systems, or components that require high mechanical force.
How Does Torque Multiplication Work?
The technical function of a torque multiplier is to multiply the torque applied at the input by reducing the rotation. In other words, it converts low-force and high-speed motion into low-speed and high-torque motion.
For example, a 3/4 power reduction gearbox with a 5:1 ratio allows an input force of 100 Nm to be converted into 500 Nm at the output.
This principle is the same as that used in industrial gearboxes, but adapted for manual or portable mechanical use.
What Are The Different Types Of Torque Multiplier?
There are several types of torque multiplier, adapted to different applications, intensities of use, and torque configurations.
Each of these types can be combined with manual, pneumatic, or electric wrenches, depending on the need. It is essential to choose a model compatible with the desired torque and the components to be operated.
These are the main types:
1. Planetary Torque Multiplier
This model is one of the most common, as it uses a set of internal gears that distribute force evenly.
It ensures high efficiency and is ideal for applications with high torque and continuous professional use.
2. Single-Stage Torque Multiplier
It has only one reduction ratio and is more compact. It is suitable for fast work requiring moderate force.
It is commonly used in light maintenance services and commercial vehicles.
3. Multi-Stage Torque Multiplier
Uses two or more consecutive reductions to generate much higher torque.
It is more robust and voluminous, suitable for large nuts and demanding tightening applications in trucks, agricultural or industrial machinery.
4. Angular Or Right Angle Torque Multiplier
It has gears that allow the angle of force application to be changed, facilitating access to tight spaces or areas with obstacles.
It is very useful in motors and compartments with limited space.
5. Wheel Torque Multiplier Wrench
This is a specific type of gear reducer used with wheel wrenches for heavy vehicles.
It has extension arms and connections adapted for wheel hubs.
6. Clutch Torque Multiplier
This is a specialized tool for hydraulic or mechanical systems to facilitate the assembly and disassembly of clutch components. It allows controlled torque to be applied without excessive effort.
What Is The Difference Between A Torque Multiplier And A Speed Multiplier?
Although both use gears to change torque and rotation, their functions are different:
- The torque multiplier is mainly used to increase the torque applied manually, facilitating the tightening or loosening of components. It is an active tool in fastening operations.
- A speed reducer is coupled to electric motors and serves to reduce the speed of rotation, controlling the operation of automated systems. Its purpose is to adjust the operating speed and not to multiply the operator’s work force.
In the automotive sector, the most appropriate term is torque multiplier, when it comes to manual or mechanical intervention with a focus on high torque.
Where Are Torque Multiplier Used?
Torque Multiplier can be used in various technical contexts, such as:
- Heavy vehicle workshops (trucks, buses, construction machinery);
- Assembly and disassembly of wheels with large nuts;
- Repair of transmissions and engine blocks;
- Industrial and agricultural maintenance services;
- Installation of metal structures with high-torque bolts.
In many of these scenarios, a torque multiplier is more effective, safer, and more ergonomic than a conventional lever or extension.
Can A Torque Multiplier Be Used With Any Motor?
In most cases, yes. You can connect the torque multiplier to different systems, provided that the input and output are compatible with the component dimensions and the required torque.
However, it is important to always respect the tool’s limits and ensure that the screws or nuts to be tightened do not exceed the mechanical resistance of the system.
Where To Buy Torque Multiplier?
Torque Multiplier are available at specialized tool stores, industrial equipment suppliers, and online platforms. To ensure you purchase an efficient, high-quality model, we recommend looking for one of KROFtools’ official distributors.
What Torque Multiplier Are Available In The Kroftools Catalog?
To improve productivity at work, KROFtools offers several torque multiplier models in its catalog that you need to know about.
Find out what options are available below.
1. Torque Multiplier 4800Nm (1″ 1:68)
This 1″ manual model offers a maximum torque of 4800Nm, with a ratio of 1:68, ideal for removing or tightening nuts on heavy vehicles.
It includes 32mm and 33mm socket wrenches and an extension bar. Made of sturdy alloy steel, it is durable and compact.
Click on the image to learn more about the Torque Multiplier 4800Nm (1″ 1:68) (Ref.: 8201).
2. 5:1 Torque Multiplier Set For Ford Ecoboost Engines
Designed specifically for mounting and tightening pulley bolts on Ford EcoBoost engines, this gear reducer provides a 5:1 ratio.
It facilitates and ensures the tightening sequence recommended by the manufacturer.
Click on the image to learn more about the 5:1 Torque Multiplier Set For Ford Ecoboost Engines (Ref.: 8202).
3. 6200Nm Torque Multiplier (1″ 1:68)
It has greater torque capacity (6200 Nm) and the same 1:68 ratio as model 8201.
Made of advanced alloy steel, it is designed for heavy-duty tasks such as dismantling and mounting tires on large vehicles. Includes wrenches and extension bar and stands out for its robustness and durability.
Click on the image to learn more about the 6200Nm Torque Multiplier (1″ 1:68) (Ref.: 8203).
What Is The Average Cost Of A Torque Multiplier?
The price of a torque multiplier depends on its type, torque capacity, materials, and reduction ratio.
On average, prices range from tens to hundreds of euros.
What Maintenance Is Required For A Torque Multiplier?
Although robust, you should keep the torque multiplier in good condition to ensure its durability. Therefore, you should:
- Clean regularly after each use to prevent the accumulation of dirt or rust;
- Lubricate the gears periodically, as indicated by the manufacturer;
- Check for looseness, cracks, or excessive wear;
- Store in a dry, clean place away from moisture, such as a tool cabinet;
- In case of intensive use, an annual technical inspection is recommended.
By taking care of your equipment, you are increasing its service life and ensuring safety while using it.
In short, the torque reducer is more than just a tool; it is an effective technical solution for handling demanding fastenings, reducing physical effort, and ensuring professional results.
By investing in the right tool and ensuring its maintenance, work performance improves significantly.
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