MTM Hand Torque Multipliers – FAQ & User Guide

Quick Answer

The MTM-Series is a line of manual torque multipliers designed to increase the torque applied by a torque wrench, allowing operators to achieve higher output torque with lower manual input.

The series includes two models, the MTM-15 and MTM-27, with maximum outputs of 1,105 lbf.ft (1,500 N·m) and 2,000 lbf.ft (2,700 N·m) respectively.

MTM multipliers are compact, portable, and require no external power source, making them suitable for heavy-duty fastening in construction, heavy equipment, power generation, and remote maintenance applications.

Who This Is For

Maintenance technicians
Field service technicians
Heavy equipment technicians
Construction professionals
Power generation facilities
Industrial maintenance teams
Manufacturing operations
Applications involving large fasteners
Remote locations without access to power

When Should You Use This?

Use an MTM Hand Torque Multiplier when:

High torque is required with reduced manual input
A conventional torque wrench alone cannot practically achieve the required torque
Electrical or pneumatic power is unavailable
A portable high-torque solution is required
Heavy-duty fastening connections need controlled tightening
Compact and lightweight equipment is preferred
Construction, heavy equipment, or power generation applications require high torque
A torque wrench is available to provide controlled input torque

The MTM is specifically designed for precision tightening of heavy-duty fastening connections and is ideal for remote locations where no power source is available.

When Should You NOT Use This?

The MTM may not be the best choice when:

Torque requirements can be handled easily with a conventional torque wrench
High-volume production requires faster powered fastening
Pneumatic or electric torque multipliers would provide greater productivity
A suitable reaction point is unavailable
Electronic torque data collection or traceability is required
Torque requirements exceed the MTM-27's maximum output of 2,000 lbf.ft
Loosening is the primary application

For substantially higher torque requirements, the HG Hand Torque Multiplier Series provides additional capacities.

How the MTM Hand Torque Multiplier Works

The MTM uses internal gearing to multiply the input torque applied by a torque wrench.

During operation:

A torque wrench is connected to the multiplier's female square input drive.
The appropriate socket is installed on the male output square drive.
A reaction bar is positioned securely against a suitable reaction point.
The operator applies torque using the torque wrench.
The internal gearing multiplies the input torque according to the model's torque multiplication ratio.
The reaction device counteracts the rotational force generated by the multiplier.
The multiplied torque is delivered to the fastener.

The MTM is designed specifically for operation in combination with a torque wrench.

Result:

Higher torque output with lower manual input
Controlled precision tightening
Reduced physical effort
Portable high-torque capability
No electrical or pneumatic power required

Core Features

Manual mechanical torque multiplier
Two available models
Maximum output up to 2,000 lbf.ft (2,700 N·m)
Accuracy better than ±5%
Designed for precision tightening of heavy-duty fastening connections
Low input torque produces high output torque
Designed for operation with a torque wrench
Portable, compact, and lightweight
Quality steel construction
Matted finish
Requires no external power source
Suitable for remote locations
Supplied in a plastic carrying case
Reaction accessories included with each case set

Available Models

The MTM-Series includes two hand torque multiplier models.

Model	Item #	Maximum Input	Maximum Output	Torque Multiplication Ratio	Input Drive	Output Drive
MTM-15	215026	170 lbf.ft / 231 N·m	1,105 lbf.ft / 1,500 N·m	6.5:1	1/2" Female Sq. Dr.	3/4" Male Sq. Dr.
MTM-27	215027	559 lbf.ft / 758 N·m	2,000 lbf.ft / 2,700 N·m	3.3:1	3/4" Female Sq. Dr.	1" Male Sq. Dr.

Model Selection Guide

If you need:	Recommended Model
Up to 1,105 lbf.ft	MTM-15
Up to 2,000 lbf.ft	MTM-27
1/2" torque wrench input	MTM-15
3/4" torque wrench input	MTM-27
3/4" output drive	MTM-15
1" output drive	MTM-27
More compact, lightweight option	MTM-15
Highest MTM torque capacity	MTM-27

Select the multiplier based on the required output torque, available torque wrench, square drive requirements, available reaction point, and workspace.

MTM-15

The MTM-15 is the smaller of the two MTM multipliers.

Specifications:

Item #: 215026
Maximum input: 170 lbf.ft (231 N·m)
Maximum output: 1,105 lbf.ft (1,500 N·m)
Torque multiplication ratio: 6.5:1
Female input: 1/2" square drive
Male output: 3/4" square drive
Approximate length: 6 1/3" (160 mm)
Approximate height: 3 7/8" (97 mm)
Weight: 5.7 lbs

The MTM-15 provides the greater multiplication ratio of the two models and is suitable when a compact multiplier with a 3/4" output drive meets the application requirements.

MTM-27

The MTM-27 provides the highest torque capacity in the MTM-Series.

Specifications:

Item #: 215027
Maximum input: 559 lbf.ft (758 N·m)
Maximum output: 2,000 lbf.ft (2,700 N·m)
Torque multiplication ratio: 3.3:1
Female input: 3/4" square drive
Male output: 1" square drive
Approximate length: 7 1/2" (190 mm)
Approximate height: 4 1/3" (111 mm)
Weight: 7.5 lbs

Choose the MTM-27 when the application requires higher output torque or a 1" output drive.

Understanding Torque Multiplication Ratio

The torque multiplication ratio indicates how the multiplier increases the torque applied at its input.

The two MTM models use different ratios:

MTM-15: 6.5:1
MTM-27: 3.3:1

The MTM-15 therefore provides greater multiplication of the input torque, while the MTM-27 is designed to accept substantially higher input torque and produce a higher maximum output.

Always use the appropriate multiplier specifications and operating instructions when determining the required torque wrench setting.

Reaction Devices

A reaction device is essential when operating a torque multiplier.

As the MTM multiplies torque, an opposing reaction force is generated. The reaction bar transfers this force against a suitable stationary reaction point so the multiplier can deliver torque to the fastener.

The product sheet shows several reaction components supplied with the MTM case sets, allowing the tool to be configured for different fastening environments.

The reaction device should always be securely positioned before torque is applied.

MTM Case Sets

Both MTM models are supplied as case sets with the multiplier and reaction components.

MTM-15 Case Set

Includes:

MTM-15 multiplier
Reaction Bar, 380 mm
Reaction 90° Base
Reaction 90° Bar
Breakaway Adapter
Plastic carrying case

MTM-27 Case Set

Includes:

MTM-27 multiplier
Reaction Bar, 380 mm
Reaction 90° Base
Reaction 90° Bar
Plastic carrying case

The product sheet specifically lists the Breakaway Adapter with the MTM-15 case set, but not with the MTM-27 case set.

Setup & Operation

Determine the required fastener torque.
Select the MTM model with sufficient output capacity.
Select a compatible torque wrench for the multiplier's input drive and required input torque.
Determine the appropriate torque wrench setting for the desired output.
Install the appropriate impact-rated socket on the output drive.
Position the multiplier on the fastener.
Install and position the appropriate reaction device.
Ensure the reaction device is securely supported against a suitable reaction point.
Connect the torque wrench to the multiplier's input drive.
Apply force slowly and smoothly.
Continue until the required torque wrench setting is reached.
Release the load according to the tool's operating procedure before removing the multiplier.

Correct reaction setup is essential when using any torque multiplier because the reaction device must safely counteract the torque generated by the tool.

Accuracy & Torque Control

The MTM-Series provides accuracy better than ±5% and is designed for precision tightening of heavy-duty fastening connections.

The multiplier itself does not determine when the target torque has been reached. It is used in combination with a torque wrench, which provides the controlled input torque.

For critical applications, the complete torque wrench and multiplier system should be periodically verified according to the facility's torque control and quality procedures.

MTM vs. HG Hand Torque Multipliers

Both MTM and HG multipliers provide manual torque multiplication without requiring an external power source, but they serve different torque requirements.

Feature	MTM	HG
Operation	Manual	Manual
External Power Required	No	No
Used with Torque Wrench	Yes	Yes
MTM Maximum Output	2,000 lbf.ft	Higher capacities available
Number of MTM Models	2	Larger model range
Primary Advantage	Compact, portable high-torque solution	Broad range of heavy-duty torque capacities
Best For	Portable heavy-duty tightening	Higher-torque industrial bolting

Choose the MTM when portability, compact size, and torque up to 2,000 lbf.ft meet the application requirements.

Choose the HG-Series when substantially higher torque capacity or a broader range of multiplier configurations is required.

Common Applications

The MTM-Series is commonly used in:

Construction
Heavy equipment
Power generation
Industrial maintenance
Field service
Machinery installation
Large equipment assembly
Remote maintenance locations
Heavy-duty fastening connections

Mountz specifically identifies construction, heavy equipment, and power generation as common MTM applications.

Use Cases (Real-World Examples)

Remote Maintenance

Problem: A technician needs high torque at a location without access to electricity or compressed air.

Solution: The MTM operates mechanically with a torque wrench and requires no external power source.

Heavy Equipment Fastening

Problem: Large fasteners on heavy equipment require more torque than is practical to apply directly with a standard torque wrench.

Solution: The MTM multiplies the input from the torque wrench, providing high output torque with reduced manual input.

Portable Field Service

Problem: A technician needs to transport high-torque equipment between service locations.

Solution: The MTM's compact and lightweight design, reaction accessories, and carrying case provide a portable manual bolting solution.

Higher-Torque Fastening

Problem: An application requires torque approaching 2,000 lbf.ft.

Solution: The MTM-27 provides maximum output up to 2,000 lbf.ft (2,700 N·m) with a 1" male square output drive.

Maintenance

Keep the multiplier clean and free of contamination.
Inspect the female input and male output square drives for wear or damage.
Inspect the reaction bar, reaction base, and other reaction components before use.
Ensure reaction accessories are correctly installed and secure.
Use sockets rated for the torque output of the multiplier.
Maintain and calibrate the torque wrench used with the multiplier.
Periodically verify multiplier performance according to facility procedures.
Store the multiplier and accessories in the supplied carrying case.
Remove damaged or improperly functioning components from service until inspected or repaired.

Integration & Advanced Notes

Manual mechanical torque multiplier
Two models: MTM-15 and MTM-27
Maximum output from 1,105 to 2,000 lbf.ft
Accuracy better than ±5%
Used in combination with a torque wrench
No electrical or pneumatic power required
MTM-15 multiplication ratio: 6.5:1
MTM-27 multiplication ratio: 3.3:1
1/2" or 3/4" female input square drive depending on model
3/4" or 1" male output square drive depending on model
Quality steel construction with matted finish
Compact, portable, and lightweight
Reaction components supplied with case set
Plastic carrying case included

Media & Supporting Content

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