Electric Torque Multiplier EC-A, construction and control, Alkitronic

The Alkitronic EC-A series of electric torque multipliers operates on mains power and features an angled gear head. The lineup includes seven models, from EC-A 50 to EC-A 100, with torque capacities ranging from 190 to 6,530 Nm depending on the selected model. Square drive sizes are available from 1 inch to 1.1/2 inch.

The angled head design reduces overall tool height compared to in-line models, making it ideal for bolting tasks near ceilings, adjacent to walls, or within confined machinery spaces. The gear mechanism is identical to the EC-S series, with the primary difference being the angled output. The unit accepts supply voltages from 100 to 253 V at 45 to 66 Hz, with a maximum power consumption of 1,100 W, making it compatible with most site power sources, including portable generators. IP54 protection ensures safe operation in humid environments or light rain.

Electric torque multiplier Alkitronic EC-A: construction and control

Drive and torque control

A brushless synchronous motor provides rotation, eliminating brush wear and reducing maintenance requirements. A microprocessor controller monitors the bolted joint and automatically shuts off power when the preset torque is achieved. The tool delivers repeatability within ±2% on the same joint. An anti-glare OLED display ensures clear readings even in direct sunlight. The handle rotates 360 degrees, allowing the reaction force to be absorbed by the support arm.

• Brushless synchronous motor for low wear and minimal maintenance
• Microprocessor-controlled automatic shut-off at preset torque
• Repeatability within ±2% on identical joints
• Anti-glare OLED display for outdoor readability
• 360-degree rotating handle
• Cast aluminium motor housing for reduced heat buildup

The standard configuration includes torque-controlled tightening. Additional modes are available upon request, such as torque plus angle tightening, tightening by number of turns, and Bluetooth data transfer. When data transfer is enabled, each tightening result can be logged for documentation and later analysis.

Power supply and site conditions

The tool accepts mains input from 100 to 253 V at 45 to 66 Hz, covering most global power networks. Maximum power draw is 1,100 W. It can also operate from portable generators, making it suitable for remote or offshore locations. IP54 protection guards against dust and splashing water. The robust aluminium housing protects the drive and electronics during transport between bolting locations.

• Supply voltage: 100 to 253 V, 45 to 66 Hz
• Maximum power input: 1,100 W
• Compatible with portable generators
• IP54 protection rating
• Aluminium housing

Weight specifications exclude the reaction arm. Each model is supplied with a standard support arm matched to the output square size. Since the tool is powered by mains electricity, there is no need for hydraulic pumps, hoses, or compressed air lines at the work site, keeping the setup lightweight for elevated or scaffolded work.

Common applications

These tools are widely used in wind turbine maintenance for tower flange and blade root bolting. They are essential in steel structure assembly for controlled preload on large bolted joints. Power plant applications include turbine casings, pipe flanges, and anchor bolts. Shipbuilding and offshore industries use them for engine mounts and structural connections. Oil and gas maintenance teams rely on them for flange work during shutdowns. They are also valuable in heavy industrial maintenance where documented tightening values are critical.

Catalog data: EC-A 50, art. no. 43524

The EC-A 50 is the entry-level model in the series. Its catalog data specifies a torque range of 190 to 1,870 Nm (140 to 1,340 ft.lbs.), with torque adjustable in 10 Nm increments. The output square is 1 inch. The catalog confirms the angled design, brushless synchronous motor, IP54 rating, and aluminium housing.

• Torque range: 190 to 1,870 Nm (140 to 1,340 ft.lbs.)
• Torque increments: 10 Nm
• Square drive: 1 inch
• Scope of delivery: standard support arm, graphic display, operating and service manual, calibration certificate, carry case

Selection should be based on the required torque range and the square drive size compatible with existing sockets. Access constraints determine whether the angled EC-A head or an in-line model is more suitable. The variant table on this page lists all available sizes, each with its specific torque range and drive size.