Hand Adjustable Torque Limiter

clock May 20, 2018 07:30 by author Mach III Clutch

T4Q1R-001_highres_outlinedThis torque limiter is used as a tension brake. The operator uses the knurled adjustment knob to vary the tension on a roll of film as it is unwound and applied to an architectural panel. The unit is constructed on a solid drive hub that extends from the unit and has a half inch wide and deep slot output to accommodate the tang on the core chuck.

Other configurations of this design are possible so if on-the-fly adjustment would be a benefit in your application, contact our factory based engineering and design team. All Mach III products are made in the USA and lead times for custom designs average less than 4 weeks. 

View the Spec Sheet

Go To the Custom Torque Limiter Page

Torque Coupling with O-Ring/Retainer Pin Connections Enables Quick Socket Changeovers and Prevents Stripped Threads

clock February 1, 2017 02:45 by author Mach III Clutch

O-Ring_Connected_Torque CouplingUsed for installing switching mechanisms on railway lines, the drill press to which this torque limiting coupling is attached sinks large screws into railroad ties made of various materials such as steel, concrete, plastic and wood. Each material requires a different size of screw and a different amount of drive torque. The railroad workers are able to manually adjust the slip torque setting of the coupling to the value needed for each material by loosening or tightening the adjustment nut. The output shaft allows for the quick interchange of sockets to accommodate the various screw sizes.

Mach III provides rapid turn-around for application adapted designs. This torque limiter was designed and quoted within 24 hours of the initial discussion between the client and our engineers. The units were manufactured within 3 weeks. 

To see how this unit limits torque transmission, Click Here.

To learn about custom solutions and our custom design process Click Here.

View the Spec Sheet

Wash Down Clutch With a Lead Time That Saved The Day

clock February 11, 2016 06:35 by author Mach III Clutch

C5A3K-001A food processing equipment manufacturer received an unexpected and unpleasant piece of news when they tried to purchase the nickel plated jaw tooth clutch they had designed into a new machine, a 16 week lead time!  Needing a 5 week lead time to meet the delivery date required by their customer, the manufacturer contacted us.  Did Mach III have a clutch that was equivalent?  Could we deliver in 5 weeks?  After reviewing the application and coordinating with production, our engineering team said, "Yes."

Our designers even found a way to expedite installation by incorporating an adapter so the clutch could be directly connected to the Lovejoy L150 elastomeric spider coupling used in the machine design.

The base for this design is the C5A2K-STH catalog model. For corrosion resistance, the unit is sealed and all exposed components are made from stainless steel and aluminum. This clutch is a prime example of the quick customization available from Mach III.  

View The Spec Sheet 

Holding Brake Connects Directly To Rotary Actuator

clock June 29, 2015 17:59 by author Mach III Clutch

Mach III Holding BrakeLike many of Mach III’s custom designs, this brake design began with an inquiry about a catalog model spring engaged brake.  An engineer working on a drive system needed a holding brake to prevent a Rexroth RAK-8D  actuator from being back driven and losing position if air pressure was lost. The connection to the actuator was a 19mm square rather than a typical round shaft and key and, since the system would be on an offshore oil drilling platform, the brake had to be enclosed.

While it was possible to enclose the D4F3R-STH brake the engineer had inquired about and produce it with a square input, he would have to make changes to his design to connect the brake to the motor. Instead, Mach III engineers presented the concept of this enclosed spring engaged, air released brake with a flange containing six through holes on an 80mm bolt circle to connect directly to the actuator. The brake has 500 pound inches of torque and requires 77 PSI to release.  The time span between the initial inquiry and the quotation for the custom design was just 4 days. The lead time to produce this
completely custom brake solution was only 3 short weeks.

Click here to view the spec sheet.

Torque Limiter Coupling with Interchangeable Output

clock March 18, 2015 09:50 by author Mach III Clutch

Morse_Taper_Torque_Limiter_CouplingCommonly used to open and close gate valves in water treatment and irrigation systems, this friction torque limiter coupling connects to a power drill with a #3 Morse taper socket.  A variety of output options are available including different sized squares and keyed bores.   The coupling is pre-set at the factory to a torque value you specify and may be adjusted in the field if needed.  When the torque setting is exceeded, the coupling slips to prevent over tightening.

Torque Limiter Details

  • #3 Morse Taper Input
  • Weight:  7 pounds
  • 4.5 Inch Outside Diameter, Length Varies By Coupling
  • Torque Settings Between 10 and 233 Pound Feet Can Be Specified

Coupling Options Shown

  • Top:  1.0 Inch Bore with Standard Keyway and Set Screws
  • Left:  0.75 Inch Square
  • Center:  2.0 Inch Square (Fits 2 Inch Square AWWA Operating Nut)
  • Right:  0.75 Inch Bore with Standard Keyway & Set Screws
  • Coupling Weight:  1 – 2 pounds

Download Spec Sheet and 3D Models

Shaft Connection Options for Clutches, Brakes and Torque Limiters

clock February 20, 2015 02:01 by author Mach III Clutch

Mach III Shaft Connection Options

Mach III will modify its catalog model friction clutches, brakes and torque limiters or create an original design that connects to the shaft the way you prefer. Pictured are a few examples, clockwise from top left:

  • Traditional bore and keyway with set screw. Available in both Imperial and Metric sizes with standard or non-standard keyways.
  • Broached for a square shaft
  • Extended hub with bore and keyway, slotted for connection to the shaft with clamp collar
  • Extended hub with bore and shrink disc

Visit Our Custom Solutions Page To Learn More

Custom Design Solutions: Clutch with Spider Coupling Adapter

clock July 22, 2014 12:37 by author Mach III Clutch

This clutch is similar to the  58SI  SensiFlex® shaft input tension control clutch.  It has been modified to include a pilot mounted coupling hub which mates with a spider coupling (a.k.a.  jaw coupling).  This clutch is drop-in ready to simplify installation.spider-coupling illustration

Would a custom design make your assembly process easier?  Mach III supplies custom adapters and couplings for many catalog models. 

Torque Limiter with Bearing Supported Coupling

clock January 21, 2014 05:05 by author Mach III Clutch

Mach_III_V6G2G-001_Torque LimiterAt Mach III, we try to find balance between due diligence regarding new applications and driving our customers and prospects crazy with questions, but this is one example of where it prevented a costly mistake.  This design evolved from an order for the  V6G1G-STL torque limiter mechanism with coupling.  The catalog model was chosen by the end user after consulting Mach III’s website and the company tasked with building the equipment ordered what was specified. 

At the time of the order, however, there were several red flags that led to contact between Mach III’s engineering team and the project engineer.  Their discussions and a review of layout sketches revealed that V6G1G-STL was unsuitable as there was no support for the coupling shaft and the unit did not have the required torque capacity.  The unit which resulted, V6G2G-001 pictured above, includes a rigid coupling with internal bearing to pilot the 1.75 Inch drive shaft and support the 2.0 inch coupling shaft.  It has a torque capacity of 8,777 pound inches, almost 3 times more than the model originally chosen. 

View The Spec Sheet

Brake with Air Released Coupling Simplifies Process

clock July 3, 2013 02:22 by author Mach III Clutch

Brake with Air Released CouplingAn air engaged friction brake and air released coupling are combined in this custom designed assembly.  The brake stops and holds a roll of material during a laminating process. When the process is complete, the user applies air to the coupling which then slides open. The roll, joined to the coupling with a tang-end shaft, can then be quickly removed. 

The air released coupling is also available as a stand-alone item.  

Sealed Clutch With Output Flange For Heavy Wash Down

clock March 11, 2013 14:58 by author Mach III Clutch

A pair of these clutches drive vertically mounted brushes which scrub the sides of a vehicle in an automatic car wash. This clutch had to fill two requirements: (1) operate in an environment where exposure to both water and detergent is constant and (2) support the brush assembly. Mach III Sealed Clutch with Custom Output Flange Below are the special features incorporated into this design:

  • Enclosed, sealed aluminum housing
  • Grease packed under top oil seal and inside the flange housing to prevent water seepage
  • Port in housing for vent tube.  Ventilation prevents the clutch from acting as a pump and drawing water into itself during disengagement.
  • Custom output flange

View Spec Sheet

Custom Air Released Coupling Facilitates Quick Roll Change

clock December 13, 2012 15:07 by author Mach III Clutch


This air released coupling was custom designed for an application requiring a quick and simple means of inserting and removing rolls of material.  The face of the coupling (right) bolts to the machine frame.  Air is applied to the coupling when the operator presses a button which retracts the sleeve and exposes the slotted shaft end.  The operator can then slide a tanged shaft into the coupling.  When the air is released, the coupling sleeve closes to retain the shaft. 

The shaft is driven by a clutch which is connected to the extended shaft shown on the left side of the coupling. This coupling can be used with a clutch for stop/start or tensioning applications or a brake for stopping, holding or tensioning applications






Custom Design Solutions: Clutch with Undersized Pulley

clock June 28, 2012 17:31 by author Mach III Clutch

For a laminating machine, the customer required Mach III’s catalog model 58PI SensiFlex tension control clutch. However, the machine design called for a 44 tooth, 5M belt pulley that was too small in diameter to 58PI--ADPTR-020-WEB5fit on the clutch’s 2.75 inch diameter pilot. The solution to this dilemma is a custom adapter including a P44-5M-25 pulley that bolts to the 58PI pilot. The set screws which fix the clutch to the shaft are accessed through a hole in the adapter.

Mach III has the capability to supply custom adapters and couplings for many catalog models.

Custom Design Solutions: Special C-Face Mounting

clock June 8, 2012 11:57 by author Mach III Clutch

C3C2P-001Mach III designs and manufactures clutches, brakes and torque limiters in custom c-face configurations.  In this example, the customer needed a device to limit the torque between the motor and a coupling which was used to fasten a cap.  The customer required the torque setting to be adjustable.

Mach III suggested an air engaged clutch.  The customer would be able to adjust the torque applied to the capper coupling by increasing or decreasing the air pressure supplied C3C2P-001 001to the clutch.  When the capper met resistance, the clutch would slip.

Unique in this application was the motor face which required that the clutch mounting flanges be off-center from the clutch housing.  The motor and capper coupling were sent to Mach III so the dimensions could be verified.  The second photograph shows the finished clutch in place between the motor and capper coupling.

Custom Design Solutions: Special Adapter & Torque Requirement

clock June 1, 2012 14:12 by author Mach III Clutch

Mach III frequently modifies catalog products to accommodate mounting and torque capacity requirements.  Here is an example:

M5R2K-STHCatalog Model:  MBR2K-STH

  • Double Disc, Air Actuated Heavy Duty Friction Clutch Mechanism
  • Torque Rating:  21,200 pound inches @ 80 PSI
  • Mechanism Bore:  Any size specified by customer to 3.5 Inch Maximum with Standard Keyway
  • Standard Adapter with 8.563 Inch Bolt Circle
  • Lead Time:  4 Weeks


Custom Model:  MBR3K-001

  • Triple Disc, Air Actuated Heavy Duty Friction Clutch Mechanism
  • Torque Rating:  31,800 pound inches @ 80 PSI
  • Mechanism Bore: 2-15/16 Inch with Standard Keyway
  • Custom Flange Adapter with 14.0 Inch Bolt Circle
  • Lead Time: 5 weeks

Contact our engineering department to start working on a custom design solution for your application. 

Torque Coupling with Morse Taper Input

clock March 25, 2012 01:10 by author Mach III Clutch

Used to open and close gate valves in water treatment and irrigation systems, this friction torque limiter coupling connects to a power drill with a #3 Morse taper socket. The coupling is pre-set at the factory to a torque value you specify and can be adjusted in the field if needed.  When the torque setting is exceeded, the coupling slips to prevent over tightening.

T4X2R-STH Torque Limiter + COUPL-032 Coupling

  • Male #3 Morse Taper Input
  • Torque Settings Between 10 and 233 Pound Feet
  • Coupling Shown Fits 2 Inch Square AWWA Operating Nut
  • Other Coupling Options Available

This design can be adapted for multiple uses, including mounted directly to a hand operated wheel (see our Taming the Gorilla article).  

Mach III is a leader in the design and manufacture of custom friction torque limiters.  Contact us about your application. 

Morse Taper Input Torque Limiter Coupling

clock April 22, 2009 05:59 by author Mach III Clutch

This torque limiter is part of an assembly used to open and close a gate valve.  The Morse taper input connects to a handheld power tool while the female square output connects to a square boss on the valve assembly.  The torque limiter prevents over-tightening the valve.


  • #3 Morse Taper Input Torque Limiter Coupling - Square Output
  • Variable Output Options:  Unit shown has a 2.06 Inch square.  Other geometries available including imperial and metric bores with keyways.
  • Maximum Torque Setting:  1400 pound inches

Contact Mach III to enquire about this assembly or the configuration and torque value you require:

3D Model Request


Model Type: