Quick Answer
EFC-R Electric Radial Gearing Torque Multipliers are designed for precision tightening and loosening of heavy-duty fasteners in limited-clearance applications. Their low-profile radial head provides access where conventional tool configurations may be difficult to position, while the continuously rotating hex drive provides smooth, non-impacting operation and automatically shuts off when the preset torque is achieved. EFC-R models provide 413–2,787 lbf.ft (560–3,780 N·m) of torque at 2 RPM and are available with 36 mm, 46 mm, or 80 mm hex drives.
Who This Is For
- Maintenance technicians
- Field service technicians
- Plate heat exchanger service teams
- Industrial maintenance operations
- Applications requiring heavy-duty fastening
- Applications with limited tool clearance
- Applications using large hex fasteners
- Facilities where electric operation is appropriate
When Should You Use This?
Use an EFC-R Electric Radial Gearing Torque Multiplier when:
- High-torque fastening is required.
- Working clearance is limited.
- A low-profile radial head is appropriate for the application.
- Electrical power is available.
- Large hex fasteners require precision tightening or loosening.
- Smooth, continuous, non-impacting operation is preferred.
- Automatic shut-off at the preset torque is required.
- Plate heat exchanger service is being performed.
- A reaction stud can be securely positioned.
- Different fastener sizes need to be accommodated with drop-in hex adapters.
Mountz specifically identifies the EFC-R for plate heat exchanger applications and limited-clearance fastening.
When Should You NOT Use This?
An EFC-R may not be the appropriate choice when:
- Electrical power is unavailable.
- The required torque falls outside the EFC-R operating range.
- A suitable reaction point cannot be established.
- A standard square-drive multiplier is required.
- A pneumatic tool is required by the application.
- The fastening location does not suit a radial hex-drive configuration.
- The tool would be used for an application other than tightening or loosening heavy-duty fasteners.
For applications requiring another power source or drive configuration, consider the appropriate Mountz pneumatic, inline electric, right-angle electric, hand, or other radial gearing torque multiplier.
How EFC-R Electric Radial Gearing Torque Multipliers Work
The EFC-R uses an electric drive and radial gearing system to deliver high torque through a continuously rotating hex drive.
During operation:
- Select the appropriate EFC-R model and drop-in hex adapter.
- Install the hex adapter securely.
- Position the hex drive completely over the fastener.
- Position the reaction stud against a safe, stable support.
- Connect the multiplier to the appropriate AC power source.
- Select the required torque setting and direction.
- Activate the multiplier.
- The hex drive rotates continuously to tighten or loosen the fastener.
- During tightening, the multiplier automatically shuts off when the preset torque is reached.
The continuous rotating design provides smooth, non-impacting operation rather than impact hammering.
Result
- Precision high-torque fastening
- Automatic shut-off at preset torque
- Smooth, continuous rotation
- Non-impacting operation
- Low-profile access
- Electric operation
- Reaction stud torque absorption
- Interchangeable hex sizing
Core Features
- Electric radial gearing torque multiplier
- Accuracy better than ±5%
- Compact low-profile radial head
- Continuously rotating hex drive
- Automatic shut-off at preset torque
- Smooth, non-impacting operation
- Reaction stud absorbs torque reaction
- Drop-in hex adapters
- Universal AC input: 100–253V / 45–66 Hz
- LED display
- 2 RPM operating speed
- 36 mm, 46 mm, and 80 mm hex drive options
- Specifically designed for plate heat exchanger applications
- Designed for limited-clearance fastening
EFC-R Electric Radial Gearing Torque Multiplier Models
EFC-R Electric Radial Gearing Torque Multipliers are available in three models. All three provide the same torque range and operating speed; the primary differences are hex drive size and physical dimensions.
Available Models
| Model | Item # | American Torque Range | S.I. Torque Range | Hex Drive | Speed | Weight |
|---|---|---|---|---|---|---|
| EFC-R 36P | 210184 | 413–2,787 lbf.ft | 560–3,780 N·m | 36 mm | 2 RPM | 26.3 lbs |
| EFC-R 46P | 210185 | 413–2,787 lbf.ft | 560–3,780 N·m | 46 mm | 2 RPM | 33 lbs |
| EFC-R 80P | 210186 | 413–2,787 lbf.ft | 560–3,780 N·m | 80 mm | 2 RPM | 48.5 lbs |
Model Dimensions
| Model | Length | Width | Radius | A1 | Stud Bolt A2 |
| EFC-R 36P | 15.2 in (385 mm) | 6.4 in (163 mm) | 56 mm | 100 mm | — |
| EFC-R 46P | 16.7 in (425 mm) | 7.4 in (188 mm) | 73 mm | 112 mm | — |
| EFC-R 80P | 18.7 in (475 mm) | 9.1 in (230 mm) | 85 mm | 130 mm | 160 mm |
Physical dimensions are important when selecting a model for a restricted-access application.
Model Selection Guide
| If you need: | Recommended Model |
| 36 mm hex drive | EFC-R 36P |
| 46 mm hex drive | EFC-R 46P |
| 80 mm hex drive | EFC-R 80P |
| Smallest and lightest EFC-R | EFC-R 36P |
| Largest hex drive | EFC-R 80P |
| Torque up to 2,787 lbf.ft | Any EFC-R model |
| Plate heat exchanger service | Select based on hex size and clearance |
When selecting an EFC-R model, consider:
- Required hex size
- Available working clearance
- Tool dimensions
- Tool weight
- Reaction point location
- Required fastening torque
Because the three models share the same torque range and 2 RPM operating speed, hex drive size and physical fit are the primary model-selection differences.
Radial Gearing Design
The EFC-R features a compact, low-profile radial head specifically designed to provide access where clearance is limited.
This configuration is useful when surrounding equipment or the fastening layout makes a conventional multiplier difficult to position.
Key characteristics include:
- Low-profile head
- Radial drive configuration
- Continuous hex rotation
- Reaction stud torque absorption
- Multiple hex drive sizes
Continuous Rotating Hex Drive
The EFC-R uses a continuously rotating hex drive rather than an impacting mechanism.
Mountz states that the continuously rotating hex drive is faster than hydraulics and more reliable than impacting tools.
The drive rotates continuously during tightening or loosening, providing:
- Smooth torque application
- Non-impacting operation
- Continuous fastener rotation
Automatic Shut-Off
EFC-R Electric Radial Gearing Torque Multipliers shut off when the preset torque is achieved.
During tightening:
- The required torque is preset.
- The multiplier rotates the fastener continuously.
- Torque increases as the fastener is tightened.
- The tool automatically stops when the preset torque is reached.
This provides controlled electric torque application without relying on impact hammering.
Electric Operation
EFC-R models operate from an AC electrical supply and do not require compressed air for operation.
Electrical Requirements
- Voltage: 100–253 VAC
- Frequency: 45–66 Hz
Mountz identifies this as a universal AC input for its electric radial gearing models.
Before operation:
- Verify the electrical supply.
- Inspect the power cord and plug.
- Make sure electrical connections are secure.
- Disconnect power before changing adapters or performing service.
LED Display
EFC-R Electric Radial Gearing Torque Multipliers feature an LED display.
Use the controls provided with the multiplier to select the required fastening settings and direction according to the operating instructions for the tool.
Because the available EFC-R product information does not specify the same 19-stage LED programming used on some other Mountz electric multiplier models, this article does not assume that the EFC-R uses those same controls.
Reaction Stud
Torque reaction on the EFC-R is absorbed by a reaction stud.
Before operation:
- Make sure the reaction stud is properly installed.
- Position it against a safe, stable reaction point.
- Verify that the reaction point can support the force generated during fastening.
- Keep hands and body parts away from the reaction area during operation.
The reaction stud is an essential part of the tool's fastening setup.
Plate Heat Exchanger Applications
Mountz specifically states that EFC-R Electric Radial Gearing Torque Multipliers are designed for plate heat exchanger applications.
Plate heat exchanger fastening can involve large hex fasteners positioned where clearance is restricted. The EFC-R addresses these requirements with:
- A low-profile radial head
- Continuous hex rotation
- Drop-in hex adapters
- Reaction stud design
- Electric operation
- Automatic shut-off
The EFC-R may also be used for other heavy-duty fastening applications when its torque range, hex configuration, and physical dimensions suit the application.
Drop-In Hex Adapters
EFC-R models use drop-in hex adapters to reduce or enlarge the tool's hex drive for different fastener sizes.
Mountz states that:
- Hex adapters are sold separately.
- Stock sizes are available.
- Custom sizes are available.
Available Metric Sizes
36 mm drive
- 24 mm
- 27 mm
- 30 mm
- 32 mm
46 mm drive
- 36 mm
- 41 mm
80 mm drive
- 46 mm
- 50 mm
- 55 mm
- 60 mm
- 65 mm
- 70 mm
Available Standard Sizes
36 mm drive
- 1 1/16"
- 1 1/8"
- 1 1/4"
- 3 31/32"
46 mm drive
- 1 7/16"
- 1 5/8"
80 mm drive
- 1 13/16"
- 2"
- 2 3/16"
- 2 3/8"
- 2 9/16"
- 2 3/4"
Select the adapter that matches both the EFC-R drive configuration and the fastener.
Setup & Operation
Before operating an EFC-R:
- Determine the required fastening torque.
- Select the EFC-R model appropriate for the required hex drive and available clearance.
- Select the appropriate drop-in hex adapter.
- Disconnect the multiplier from power before installing or changing components.
- Inspect the multiplier and adapter for damage.
- Install the hex adapter securely.
- Position the hex drive completely over the fastener.
- Position the reaction stud against a safe, stable reaction point.
- Connect the multiplier to the appropriate AC power supply.
- Select the required torque setting and rotation direction.
- Activate the multiplier.
- Allow the tool to rotate continuously during tightening or loosening.
- During tightening, allow the multiplier to automatically shut off when the preset torque is achieved.
- Disconnect power before changing adapters or servicing the tool.
Mountz's electric multiplier instructions also state that damaged sockets or adapters should not be used and that the tool should be prepared for the fastening application before connecting it to power.
Tool Alignment & Safe Operation
Proper positioning of the multiplier, hex adapter, and reaction stud is essential.
During operation:
- Fully engage the hex adapter with the fastener.
- Position the reaction stud against a stable reaction point.
- Keep the tool properly aligned.
- Keep hands away from the reaction area.
- Do not use damaged components.
- Disconnect the tool from power before changing adapters.
- Do not operate electric multipliers in explosive environments or in the presence of combustible materials.
- Standard electric multipliers should not be used in wet areas unless the appropriate protected configuration is specified.
Calibration & Accuracy
EFC-R Electric Radial Gearing Torque Multipliers provide accuracy better than ±5%.
Mountz's electric multiplier operating instructions recommend recalibration after approximately 25 operating hours and state that the tool should be serviced if it loses power or shows signs of damage.
To support reliable performance:
- Follow the applicable calibration requirements.
- Inspect the multiplier for damage.
- Inspect the reaction stud and hex adapters.
- Remove damaged or improperly functioning tools from service.
Common Applications
Mountz directly identifies EFC-R Electric Radial Gearing Torque Multipliers for:
- Precision tightening of heavy-duty fastening applications
- Precision loosening of heavy-duty fastening applications
- Plate heat exchanger applications
- Limited-clearance high-torque fastening
Other applications should be evaluated based on the required torque, hex size, clearance, and reaction requirements rather than assuming the EFC-R is appropriate based on industry alone.
Use Cases
Plate Heat Exchanger Service
Problem: Large heat exchanger fasteners must be tightened or loosened in areas where available clearance is limited.
Solution: The EFC-R combines a low-profile radial head with a continuously rotating hex drive and drop-in hex adapters for plate heat exchanger fastening.
Limited-Clearance Heavy-Duty Fastening
Problem: A conventional torque multiplier configuration cannot be positioned easily because of surrounding equipment or restricted space.
Solution: The EFC-R's low-profile radial head provides an alternative configuration for heavy-duty fastening where clearance is limited.
Different Hex Fastener Sizes
Problem: An application includes large fasteners with different hex sizes.
Solution: Drop-in hex adapters allow the EFC-R hex drive to be reduced or enlarged for compatible fastener sizes. Stock and custom adapter sizes are available.
EFC-R Compared with Hydraulic & Impact Tools
Mountz directly states that the EFC-R's continuously rotating hex drive is faster than hydraulics and more reliable than impacting tools.
The EFC-R also operates with smooth, continuous, non-impacting rotation and automatically shuts off when the preset torque is reached.
This section intentionally avoids broader claims about when hydraulic or impact tools should be selected, because those choices depend on the specific fastening application.
Maintenance
Follow the Mountz operating instructions and your facility's maintenance requirements when caring for the EFC-R.
Key practices include:
- Inspect the multiplier before use.
- Inspect the power cord and electrical connections.
- Inspect drop-in hex adapters for damage.
- Inspect the reaction stud and reaction point.
- Do not operate damaged equipment.
- Disconnect the multiplier from power before changing adapters or performing service.
- Send the tool for recalibration according to the applicable recommendation.
- Remove the tool from service if it loses power or shows signs of damage.
Compatible Accessories
Drop-In Hex Adapters
Drop-in hex adapters are the primary documented EFC-R accessories.
They are:
- Sold separately
- Available in stock metric sizes
- Available in stock standard sizes
- Available in custom sizes
Always select an adapter compatible with the multiplier's hex drive and the fastener.
Reaction Stud
The reaction stud is used to absorb torque reaction during operation. Inspect it and its support point before use.
Media & Supporting Content
- EFC-R Electric Radial Gearing Torque Multiplier Product Page
- EFC-R Electric Radial Gearing Torque Multiplier Manual
- EFC-R Electric Radial Gearing Torque Multiplier Data Sheet
- Hex Adapters for Radial Torque Multipliers
Related Content
- Hand Torque Multipliers
- Radial Gearing Torque Multipliers
- Pneumatic Multipliers
- Guide: Enhancing Quality in Heavy-Duty Manufacturing and Repair with a Torque Multiplier
- Guide: Choosing the Right Torque Multiplier
- Safeguarding Industrial Operations: The Importance of Torque Tools in Large Asset Maintenance
- Mountz Consolidated Tools Sales Bang Sheet
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Need Help?
- Contact Applications Engineering for setup guidance
- Speak with Sales for product selection
- Call us:
- North America:(408) 850-9978
- International: +44 1428 741756
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