Quick Answer
The EF-R Series is a family of electric radial gearing torque multipliers designed for precision tightening and loosening of heavy-duty fasteners, particularly in applications with limited clearance. The low-profile radial head provides access in confined areas, while the continuously rotating hex drive delivers smooth, non-impacting operation and automatically shuts off when the preset torque is reached. EF-R models feature universal AC input, an LED display, reaction stud design, and interchangeable drop-in hex adapters. The three available models cover 413–2,787 lbf.ft (560–3,780 N·m) with 36 mm, 46 mm, and 80 mm hex drives.
Who This Is For
- Maintenance technicians
- Field service technicians
- Heat plate exchanger service teams
- Industrial maintenance departments
- Power generation facilities
- Oil and gas operations
- Petrochemical and chemical processing facilities
- Heavy equipment maintenance
- Industrial manufacturing facilities
- Applications requiring high torque in areas with limited clearance
When Should You Use This?
Use the EF-R Electric Radial Gearing Torque Multiplier when:
- High-torque fastening is required.
- Working clearance is limited.
- A low-profile radial head is needed to access the fastener.
- Electric operation is preferred.
- Smooth, continuous rotation is required.
- Automatic shut-off at the preset torque is desired.
- Large hex fasteners need to be tightened or loosened.
- Heat plate exchanger maintenance is being performed.
- A reaction stud can be securely positioned.
- Different fastener sizes need to be accommodated with drop-in hex adapters.
The EF-R is particularly suited for heat plate exchanger applications, where the low-profile radial head and continuously rotating hex drive provide access and controlled torque application around closely spaced fasteners.
When Should You NOT Use This?
The EF-R may not be the best choice when:
- Electrical power is unavailable.
- A pneumatic multiplier is preferred.
- A suitable reaction point cannot be established.
- The application requires a standard square-drive multiplier rather than a radial hex-drive design.
- Torque requirements exceed 2,787 lbf.ft (3,780 N·m).
- The application does not require the access advantages of a low-profile radial head.
For pneumatic radial gearing applications, consider the RCL Pneumatic Radial Gearing Torque Multiplier. For standard inline or right-angle electric torque multiplication, another Mountz electric multiplier series may be more appropriate.
How the EF-R Electric Radial Gearing Torque Multiplier Works
The EF-R uses an electric drive system and radial gearing mechanism to generate controlled high torque while maintaining a compact, low-profile head.
During operation:
- Select and install the appropriate drop-in hex adapter.
- Position the hex drive fully over the fastener.
- Position the reaction stud against a secure reaction point.
- Connect the multiplier to an appropriate AC power source.
- Select the required preset torque.
- 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 achieved.
The continuously rotating hex drive provides smooth, non-impacting operation. The radial gearing configuration allows the tool to reach fastening locations where clearance may prevent the use of conventional torque multipliers.
Result
- Precise high-torque fastening
- Automatic shut-off at preset torque
- Smooth, continuous rotation
- Non-impacting operation
- Improved access in limited-clearance areas
- Controlled torque application
- Interchangeable hex drive sizing
- Electric operation without compressed air or hydraulic equipment
Core Features
- Electric radial gearing torque multiplier
- Accuracy better than ±5%
- 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
- Three hex drive configurations
- Torque range of 413–2,787 lbf.ft
- Operating speeds from 11–13 RPM
- Designed for heat plate exchanger applications
- Compact design for limited-clearance fastening
- Rental program availability
EF-R Electric Radial Gearing Torque Multiplier Models
The EF-R Series includes three models. All three provide the same torque range of 413–2,787 lbf.ft (560–3,780 N·m). Model selection is primarily based on the required hex drive size, while operating speed, dimensions, and tool weight also vary by model.
Available Models
| Model | Item # | American Torque Range | S.I. Torque Range | Hex Drive | Speed | Tool Weight |
|---|---|---|---|---|---|---|
| EF-R 36P | 210187 | 413–2,787 lbf.ft | 560–3,780 N·m | 36 mm | 13 RPM | 36.3 lbs |
| EF-R 46P | 210188 | 413–2,787 lbf.ft | 560–3,780 N·m | 46 mm | 12 RPM | 41.8 lbs |
| EF-R 80P | 210189 | 413–2,787 lbf.ft | 560–3,780 N·m | 80 mm | 11 RPM | 57.3 lbs |
The EF-R 36P provides the highest operating speed at 13 RPM, while the EF-R 80P provides the largest 80 mm hex drive. All three models have the same rated torque range.
Model Dimensions
| Model | Length | Width | Radius | A1 | A2 Stud Bolts |
| EF-R 36P | 19.6 in (500 mm) | 6.4 in (163 mm) | 56 mm | 100 mm | — |
| EF-R 46P | 21.6 in (550 mm) | 7.4 in (188 mm) | 73 mm | 112 mm | — |
| EF-R 80P | 23.6 in (600 mm) | 9.1 in (230 mm) | 85 mm | 130 mm | 160 mm |
Dimensions should be considered when selecting a model for applications with restricted access.
Model Selection Guide
| If you need: | Recommended Model |
| 36 mm hex drive | EF-R 36P |
| 46 mm hex drive | EF-R 46P |
| 80 mm hex drive | EF-R 80P |
| Highest operating speed | EF-R 36P |
| Smallest and lightest EF-R | EF-R 36P |
| Largest hex drive | EF-R 80P |
| Torque up to 2,787 lbf.ft | Any EF-R model |
| Heat plate exchanger applications | Select based on hex drive size and available clearance |
When selecting an EF-R model, consider:
- Required torque
- Hex drive size
- Fastener size
- Available working clearance
- Tool dimensions
- Tool weight
- Reaction stud location
- Required operating speed
Because all three EF-R models provide the same torque range, hex drive size and physical access are the primary differences to consider when selecting a model.
Radial Gearing Design
The EF-R Series features a low-profile radial head designed to provide access where working clearance is limited. Unlike a conventional inline torque multiplier, the radial gearing configuration positions the drive at a 90-degree angle, making it well suited for applications where surrounding equipment or structures restrict access.
Benefits of the radial gearing design include:
- Low-profile access
- Compact head design
- Improved access around closely spaced fasteners
- Controlled high-torque fastening
- Smooth, continuous operation
- Reduced interference with surrounding equipment
The radial design is particularly useful for plate heat exchanger maintenance, which is one of the primary applications Mountz identifies for its radial gearing multipliers.
Continuous Rotating Hex Drive
The EF-R uses a continuously rotating hex drive to tighten and loosen heavy-duty fasteners.
Unlike a hydraulic ratcheting system that advances the fastener through repeated strokes, the EF-R maintains continuous rotation throughout operation. Mountz notes that this design is faster than hydraulic systems and more reliable than impacting tools.
Benefits include:
- Continuous fastening motion
- Smooth, non-impacting operation
- Reduced fastening time
- Improved productivity
- Controlled torque application
- No impact hammering
Depending on the model, the EF-R operates at 11–13 RPM.
| Model | Operating Speed |
|---|---|
| EF-R 36P | 13 RPM |
| EF-R 46P | 12 RPM |
| EF-R 80P | 11 RPM |
Automatic Shut-Off
The EF-R automatically shuts off when the preset torque is achieved. This allows the multiplier to apply controlled torque without relying on the operator to manually stop the tool at the target value.
During tightening:
- The operator selects the required torque.
- The tool applies smooth, continuous rotation.
- Torque builds as the fastener is tightened.
- The multiplier shuts off when the preset torque is reached.
Automatic shut-off helps provide:
- Repeatable fastening
- Controlled torque application
- Reduced dependence on operator judgment
- Improved process consistency
Electric Operation
The EF-R is an electric radial gearing torque multiplier and does not require compressed air or a hydraulic pump for operation.
Electric operation provides:
- Simple connection to an AC power source
- Smooth, continuous rotation
- No compressed air supply required
- No hydraulic pump or hoses required
- Controlled high-torque fastening
The EF-R is especially useful in facilities where electrical power is readily available and a low-profile radial gearing design is required.
Universal AC Input & LED Display
EF-R models feature universal AC input from 100–253V at 45–66 Hz, allowing the tools to accommodate a broad range of electrical supplies. They also feature an integrated LED display.
Power Requirements
- Voltage: 100–253 VAC
- Frequency: 45–66 Hz
Before operation:
- Verify the available electrical supply.
- Inspect the power cord and plug.
- Ensure electrical connections are secure.
- Disconnect the tool from power when it is not in use.
- Disconnect power before changing hex adapters or reaction components.
Mountz's operating instructions also specify disconnecting the tool from its power supply when changing sockets or support components.
Reaction Stud Design
Torque reaction on the EF-R is absorbed by a reaction stud, rather than a traditional reaction arm.
The reaction stud provides a secure reaction point while helping maintain the compact profile of the radial gearing head.
Benefits include:
- Compact reaction setup
- Reduced interference around the fastener
- Improved access in confined areas
- Stable torque reaction
- Simple positioning
The reaction stud must be completely inserted and positioned against a safe, stable support before operating the multiplier. Mountz specifically warns that proper support is only achieved when the support bolt is fully inserted into the tool housing.
Heat Plate Exchanger Applications
Mountz specifically designed its radial gearing torque multipliers for plate heat exchanger maintenance.
Plate heat exchangers can contain numerous closely spaced fasteners, making tool access challenging. The EF-R addresses these requirements with:
- A low-profile radial head
- Continuous hex drive rotation
- Reaction stud design
- Interchangeable hex adapters
- Electric operation
- Automatic shut-off
Mountz identifies radial gearing multipliers for companies servicing plate heat exchangers in industries including:
- HVAC
- Chemical processing
- Dairy
- Marine
- Petrochemical processing
Drop-In Hex Adapters
The EF-R uses drop-in hex adapters to reduce or enlarge the hex drive for different fastener sizes. Stock sizes are available, and Mountz also offers custom sizes.
The available adapter range depends on the EF-R model:
36 mm Hex Drive
Available metric sizes include:
- 24 mm
- 27 mm
- 30 mm
- 32 mm
Standard sizes include:
- 1 1/16"
- 1 1/8"
- 1 1/4"
- 3 31/32"
46 mm Hex Drive
Available metric sizes include:
- 36 mm
- 41 mm
Standard sizes include:
- 1 7/16"
- 1 5/8"
80 mm Hex Drive
Available metric sizes include:
- 46 mm
- 50 mm
- 55 mm
- 60 mm
- 65 mm
- 70 mm
Standard sizes include:
- 1 13/16"
- 2"
- 2 3/16"
- 2 3/8"
- 2 9/16"
- 2 3/4"
Hex adapters are sold separately, and custom sizes are available for applications requiring a size outside the standard offering.
Setup & Operation
Before operating the EF-R:
- Determine the required fastening torque.
- Select the appropriate EF-R model and hex adapter.
- Disconnect the multiplier from its power supply before installing or changing components.
- Install the appropriate hex adapter.
- Fully insert the reaction stud into the tool housing.
- Position the hex drive over the fastener.
- Position the reaction stud against a safe, stable support.
- Connect the multiplier to the appropriate AC power supply.
- Select the required torque setting.
- Verify the desired tightening or loosening direction.
- Activate the multiplier.
- Allow the tool to rotate continuously during operation.
- During tightening, allow the multiplier to automatically shut off when the preset torque is achieved.
- Disconnect the tool from power before changing adapters, reaction components, or performing maintenance.
Always inspect the tool, hex adapter, reaction stud, power cord, and fastening application before operation.
Tool Alignment & Safe Operation
Correct positioning of the EF-R and reaction stud is essential for safe operation.
During use:
- Fully engage the hex drive or adapter with the fastener.
- Fully insert the reaction stud into the tool housing.
- Position the reaction stud against a safe, stable support.
- Keep hands away from the reaction area.
- Do not operate the multiplier with damaged adapters or components.
- Disconnect the tool before changing adapters or reaction components.
- Never carry the multiplier by its power cord.
- Protect the power cord from heat, oil, and sharp edges.
Improper positioning or an unstable reaction point can create unsafe operating conditions and may damage the tool or fastening application.
The low-profile radial head, reaction stud, and continuous hex drive should work together as a properly supported system throughout the fastening cycle.
Calibration & Accuracy
The EF-R Series provides an accuracy of better than ±5% for controlled high-torque fastening.
To help maintain reliable performance:
- Periodically verify torque output according to your facility's quality and calibration requirements.
- Inspect the multiplier before use for signs of wear or damage.
- Inspect the hex adapters and reaction stud regularly.
- Make sure the reaction stud is completely inserted and positioned against a safe, stable support.
- Inspect the power cord and electrical components before operation.
- Remove damaged or improperly functioning equipment from service.
Mountz provides calibration and repair services for torque multipliers and can calibrate torque equipment up to 20,000 lbf.ft.
Common Applications
The EF-R is designed for heavy-duty fastening applications where high torque and limited working clearance are important.
Common applications include:
- Plate heat exchanger maintenance
- Tightening and loosening heavy-duty fastening connections
- Large industrial hex fasteners
- Limited-clearance fastening
- Industrial equipment maintenance
- Applications where a conventional inline multiplier cannot easily access the fastener
The low-profile radial head is specifically designed to provide access where clearance is limited, while the continuous rotating hex drive supports efficient tightening and loosening.
Common Industries
Mountz specifically identifies radial gearing torque multipliers for companies that service plate heat exchangers in industries including:
- HVAC
- Chemical processing
- Dairy
- Marine
- Petrochemical processing
The EF-R may also be suitable for other industrial applications where its torque range, hex drive configuration, and low-profile radial head meet the fastening requirements.
Common Industries Use Cases
Plate Heat Exchanger Maintenance
Problem: Plate heat exchangers can have fastening connections in areas where clearance is limited.
Solution: The EF-R's low-profile radial head provides access in restricted areas, while the continuous rotating hex drive supports controlled tightening and loosening of the fasteners.
Limited-Clearance Fastening
Problem: Surrounding equipment or structures make it difficult to position a conventional torque multiplier on the fastener.
Solution: The EF-R's radial drive configuration allows the multiplier to operate at a 90-degree angle, providing access in applications where an inline configuration may not fit.
Heavy-Duty Fastening
Problem: Large industrial fastening connections require controlled torque without the impacting action of an impact tool.
Solution: The EF-R provides smooth, continuously rotating torque application with an accuracy of better than ±5%.
Different Hex Fastener Sizes
Problem: An application includes fasteners with different hex sizes.
Solution: Drop-in hex adapters allow the EF-R's hex drive to accommodate different fastener sizes. Mountz offers stock adapter sizes, with custom sizes also available.
Maintenance
Proper inspection and maintenance help support reliable EF-R operation.
Before and during use:
- Keep the multiplier clean and inspect it for visible damage.
- Inspect the power cord and plug.
- Inspect the hex drive and drop-in hex adapters.
- Inspect the reaction stud and support area.
- Make sure the reaction stud is completely inserted into the tool housing.
- Remove damaged components from service.
Always disconnect the EF-R from its power supply when:
- The tool is not in use.
- Changing hex adapters.
- Changing the support or reaction components.
- Performing inspection or service.
Never carry the tool by its power cord. Disconnect the cord by pulling the plug rather than the cord, and protect the cord from heat, oil, and sharp edges.
Compatible Accessories
The primary accessories documented for the EF-R Series are drop-in hex adapters.
Drop-In Hex Adapters
Drop-in hex adapters allow the EF-R's fixed hex drive to accommodate different fastener sizes.
Adapters are available for:
- 36 mm hex drive
- 46 mm hex drive
- 80 mm hex drive
Mountz offers both metric and standard sizes. Stock sizes are listed in the Torque Multiplier Catalog, and custom sizes are also available.
Hex adapters are sold separately.
When selecting an adapter:
- Match the adapter to the EF-R's hex drive size.
- Select the appropriate size for the fastener.
- Inspect the adapter for damage or excessive wear before use.
- Make sure the adapter is properly installed before operating the tool.
Reaction Stud & Support
The EF-R uses a reaction stud to absorb torque reaction during operation.
Mountz specifies that the reaction stud must be completely inserted into the housing to avoid damage and provide safe support.
Before operation:
- Completely insert the reaction stud.
- Position it against a safe and stable support.
- Verify that the support will remain stable as torque is applied.
- Keep clear of the reaction area during operation.
Proper reaction support is essential for safe multiplier operation.
Media & Supporting Content
- EF-R Electric Radial Gearing Torque Multiplier Product Page
- Electric Torque Multiplier Operating Instructions
- EF-R Electric Radial Gearing Torque Multiplier Data Sheet
Related Content
- HG Hand Torque Multipliers
- Pneumatic Torque 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
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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