Torque multipliers

What torque multipliers do

Torque multipliers amplify input torque during bolt and nut tightening or loosening. They serve industry, construction, vehicle maintenance and mining operations. Gear ratios convert a manageable input force into a much larger output. The range in this group covers torque needs from 60 Nm up to 50,000 Nm. Operating principles include mechanical gearing, mains electric drive, battery power and compressed air. Users match each unit to required torque, available working space and the power source on site.

Selection usually starts with the fastener size and the specified tightening value. The square drive then determines which sockets and input tools can be fitted. Mechanical units pair with a torque wrench, so the operator controls the applied value directly. Powered units handle repeated cycles with less physical effort from the operator. Alkitronic and ELORA products in this group are imported from Germany. Both brands cover several body shapes for straight, angled and slim access positions.

Mechanical torque multipliers

Mechanical models work without electricity or an air line, which suits remote sites. A sealed housing holds the gear train that creates the input to output ratio. The operator applies force with a torque wrench on the input square. Output torque follows the ratio, so the reading on the wrench stays low and readable. These units remain popular for maintenance work, field service and occasional high torque tasks. Reaction arms transfer the counter force to a fixed point.

The ELORA line covers two mechanical references with planetary gear construction. 2601 offers several tightening force options across a range from 1,500 Nm to 10,000 Nm. Square drive size varies according to the selected torque band. The gear assemblies are forged for load bearing service. 2602 reaches a maximum of 2,700 Nm with a 1:4 ratio. It uses a 1" output square and a 3/4" input square.

For higher demands, M-HG from Alkitronic covers 1,400 Nm to 50,000 Nm. Different models give different relative input to output ratios. Choosing the right model means matching the target torque to the available input tool. Mechanical multipliers of this size often replace impact tools on large flange and structural connections. They keep the applied value controlled, since the input torque wrench sets the limit for each cycle.

Slim-body units for confined spaces

Some bolted joints sit between flanges, brackets or wheel components with very little clearance. Slim-body multipliers answer that problem with a flat housing and a direct hexagon grip. Instead of a socket, the hexagon opening wraps the bolt head itself. That design removes the extra height a standard socket would add. These units are driven by a torque wrench or another adjustable torque tool. Ratios differ by model, so output torque scales accordingly.

The Missing Link family covers several drive sizes and ratios. M-ML-4-1-12 uses a 1/2" square drive with a 4:1 ratio and hexagon sizes from 22 to 60 mm. Maximum input is 340 Nm with output up to 1,380 Nm. M-ML shares the same 1/2" drive and 4:1 ratio across a 340 to 1,360 Nm working span.

Larger jobs move to the 3/4" versions of the same concept. M-ML-4-1-34 converts 815 Nm of input into output up to 3,260 Nm. M-ML-6-1-34 raises the ratio to 6:1, with hexagon sizes from 32 to 70 mm and output near 4,890 Nm. Both grip the bolt head directly, which helps where socket depth is unavailable.

XCE Link range

XCE Link units suit cases where standard powered multipliers are too large or too strong. XCE-3-1-34 uses a 3/4" square drive at a 3:1 ratio, reaching 3,450 Nm. XCE-4-1-34 keeps the same drive size at a 4:1 ratio and up to 4,600 Nm. Both versions cover a series of hexagon sizes for common bolt dimensions.

The 1" versions handle the upper end of the mechanical range. XCE-3-1-1 accepts 2,440 Nm of input and delivers up to 7,320 Nm at a 3:1 ratio. XCE-4-1-1 comprises 13 models with hexagon sizes from 50 to 120 mm and output up to 9,760 Nm. Its outer shell uses aluminium alloy for corrosion resistance.

Electric torque multipliers

Electric models run from mains power and control the applied torque through the gearbox and electronics. They reduce operator effort on repeated tightening cycles and assembly lines. Straight body versions reach into deep positions, while angled bodies lower the overall height. Torque values in this group start below 100 Nm and extend into the tens of thousands. Reaction arms remain necessary, since output torque is transferred to a supporting surface during each cycle.

EC-S covers 60 Nm to 6,500 Nm across 12 straight body models with adjustable force. EF S extends the span from 350 Nm to 42,000 Nm and belongs to the XE Series introduced in 2022. EF Series straight body units are applied in wind tower erection and turbine blade mounting work.

Angled versions handle positions with restricted height. EC-A shares the EC-S mechanism with a bent head, covering 190 Nm to 6,530 Nm. EF-A uses a 90 degree head and spans 500 Nm to 9,800 Nm. Both suit recessed fasteners and installation points where a straight body cannot be positioned correctly over the joint.

Battery and pneumatic models

Battery power removes cables and air hoses from the work area. EB-S operates from 110 Nm to 6,000 Nm with a compact body and no auxiliary supply. Pneumatic units draw rotation from compressed air, with the gearbox setting the output value. PC-S covers tightening and loosening tasks that require large torque with controlled accuracy.

Alkitronic builds three pneumatic families around the same principle. PC-F addresses medium to large torque work inside restricted spaces. PC-F2 operates on air pressure between 2 and 7 bar. Air-driven units are common where electrical equipment is restricted and a compressor is already available. Output depends on inlet pressure, so a stable air supply matters for consistent results.

Heavy vehicle and mining service

Wheel work on mining trucks and heavy vehicles needs specific body shapes and long drive shafts. EB-N & PC-N covers torque up to 3,500 Nm for heavy wheel nuts. CLD-N runs on compressed air and uses a long connecting head for deeply seated nuts. CLDN offers selectable spindle lengths for different wheel positions.

To move forward, confirm the required torque value, the fastener size and the clearance around the joint. Then decide between manual gearing and a powered drive based on cycle count and available energy on site. Browse the linked models above for full specifications before ordering.