Torque multipliers

Bolted joints of large diameters often require a force that cannot be safely and efficiently generated with ordinary hand tools. A torque multiplier is designed for exactly these situations, enabling precise and controlled tightening and loosening of extremely tight or seized joints.

Where are torque multipliers used?

• In the assembly and disassembly of large bolted joints.
• In loosening corroded, rusted or seized joints.
• In the servicing of heavy equipment, trucks, and agricultural or industrial machinery.
• In the maintenance of technological units where a precisely defined tightening torque is required.

(In practice, this device is also referred to as a torque intensifier or a torque booster.)

Operating principle and main advantages

A torque multiplier works on the principle of a multi-stage planetary gearbox, which multiplies the input manual force into a significantly higher output torque. This makes it possible to safely tighten and loosen bolted joints in confined spaces where long levers cannot be used.

• Extreme performance: Output torque of up to 12,500 Nm.
• High efficiency: Mechanical transmission with minimal losses.
• Occupational safety: Controlled tightening without the risk of injury to the operator.
• Mobility and independence: Purely mechanical operation without the need for an external power source.

Our offer – two versions according to load

NMK 16–400

A compact torque multiplier suitable for standard servicing and assembly work. It is ideal for smaller and medium-sized bolted joints, where mobility and easy handling in the field play a role.

• Max. input torque: 250 Nm
• Max. output torque: 4,000 Nm
• Gear ratio: 1 : 16
• Intended for bolts: M30–M52
• Sockets supplied: 46, 50, 55, 60, 65, 70, 75, 80 mm
• Weight of gearbox with reaction arm: 7.95 kg
• Design: Two-stage planetary gearbox
• Packaging: Practical transport case (605 × 280 × 155 mm / total weight 30 kg)

NMK 78–1250

A high-performance variant intended for heavy operations, the power sector, quarries and industrial applications with extreme torque loads and large joint diameters.

• Max. input torque: 160 Nm
• Max. output torque: 12,500 Nm
• Gear ratio: 1 : 78
• Intended for bolts: M48–M80
• Sockets supplied: 75, 80, 85, 90, 95, 100, 105, 110, 115 mm
• Weight of gearbox with reaction arm: 21.65 kg
• Design: Three-stage split planetary gearbox
• Packaging: Two rugged transport cases (700 × 260 × 190 mm / total weight 34 kg)

Complete equipment ready for action

Every torque multiplier is supplied as a complete set. The standard package contains:

1. Planetary gearbox
2. Robust lever reaction arm
3. Ratchet wrench
4. Set of impact sockets
5. Durable transport case for safe logistics

Practical use and technological background

NMK torque multipliers are used across heavy industry, construction and agriculture. They often serve as a sought-after wheel wrench for trucks and heavy machinery. If your workplaces still use an older, traditional Tona torque multiplier, our NMK range represents a modern, fully-fledged, and more powerful alternative.

At the heart of the device is our planetary gearbox

The basis of NMK multipliers is a multi-stage planetary gearbox of our own design. We develop and apply this precise engineering element not only in our multipliers but also in our tube benders and other industrial systems.

We manufacture planetary gearboxes in a range of variants (e.g. types for the NMK 16-400 and NMK 78-1250 sets, or the standalone NMK 5-1250 gear module). We supply them:

• As an integral part of our equipment
• Separately for your specific industrial applications
• As certified spare parts

Custom, non-standard solutions: Based on your technical documentation, we can also design and manufacture a custom planetary gearbox with a non-standard gear ratio or dimensions.

We will help you choose

Torque multipliers are simple yet invaluable tools wherever it is necessary to eliminate brute physical force and rely on safety, precision and controlled tightening.

Are you looking for a reliable torque multiplier or do you need to consult on the right model for your operation? Contact us via the enquiry form – we will be glad to propose the optimal solution for you.