What’s the holding force of quarter Turns?


I wonder how much the Spanclamps holding force is?


The holding force, you mean probably with this the clamping force.

It depends on the model you utilize.

In the meantime high clamping force models have been designed.

See here some possibilities for "holding force":

https://www.spanclamps.com/quarter-turn                                                                                     up to 90N

What is the temperature resistance of the quarter-turn SCQT spanclamps?

For quarter turns SCQT, if these are resistant against -40°C ?

These fasteners have grease inside of the housing and the lowest resistant temperature is -20°C.

So the grease could be frozen and the knob could be stuck.

But it depends on how long the fastener is in -40°C.

If it is short, I think you can give it a try.

From 500 pieces we can investigate if a special grease can be used to lubricate the fastener.


If you need something that resists -40°C continuously we suggest the use of Turnlocks made in stainless steel


or smaller:

What is the MOQ for custom versions of Spanclamps quarter turns?

Request of Customer :

When we get a request from a customer to have a modified quarter turn.
Would you require 500 pieces or 100 pieces?
For instance for a special requirement of using another lubrificant or O-ring or another component, I think you’ll need 500 pieces?
Yesterday, I had however a request for a part that would be used with two plates of 25mm. 
The customer did ask if a special shank length could be done (so a longer shank)
Customer wrote: (Hi, is there a possibility for the length of the shaft the be extended? The two plates that will be joined together are 25mm each)
Would that be possible from less quantity for instance for: SCQT, SCSBLQT, SCBLPP, SCH-S
But want to know your capability on doing specials and the typicall leadtime that is then involved.

What is the clamping force of multiple pneumatic pull clamp SCPVT2500 in a same application?

The clamping force of SCPVT2500 clamps depends on the air pressure.
For example, the clamping force of individual clamp at 0.5 Mpa is 2.5kN.
In use of 5 units, the clamping force will be five times.

More info from page SC-182 in the catalogue :

The allowable counterforce is twice of the clamping force.
Please be aware that the weight of the workpiece should not exceed the allowable counterforce, when you turns the fixture upside down.

Also, using the clamps close to each other will not be a problem.
And of course, do not turn off the air supply during operation to prevent workpiece falling.

Please let us know if you have any questions.

What’s the recommended tightening torque of the screws you delivery together with the Clamps?


Spanclamps has a a torque recommendation for PN SCQT-LH0610/SCQT0610-LH ?

We are installing the quarter turn knobs onto a plexi plastic cover assembly ( plastic spec is polycarbonate, UL 94HB). We are trying to get a recommended torque value for the screws, part number 92010A004 (M2x0.4, 8MM Long, 90DEG Flathead Screw), that secure the quarter turn knob in place.

  1. Any chance there is a torque value Spanclamps could recommend?
  2. We are also trying to find an alternative to Loc-Tite because we suspect it’s causing our plastic covers to crack. If there is any alternative that comes to mind from your experience, we’d appreciate you sharing.


Reduce costs and be free of maintenance

A major worldwide manufacturer of off the shelf switch mode power supplies used to use self-produced clamps for clamping two plates.

Their production line was shut down a lot for repairing damaged clamps due to heat hardening.

Since they use quarter-turn fasteners, they reduced costs (by 70%!) and the clamps are maintenance-free (for over 2 years now)!


From complicated changeover to simple and time saving assembling

Your company manufactures machine parts, and you use fixtures of automated production machines to mount screws to the machine part body. Have you ever considered using ball lock clamps and button lock pins?

Many applications require "changeovers" that involve changing and replacing about 10 times a day, as a machine produces many products of different shapes and sizes.

Consider the benefits by using One-Touch Fasteners.

Less workload = less cost!

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What is a Quick dismantling lock

A Quick dismantling lock spanclamp is a fast-disassembling system, including different fixing elements for panels 

The Quick dismantling lock Spanclamps provide a clear indicator ON / OFF for fast-disassembling 

The advantages of Quick dismantling lock are several, as well as convenient assembling and disassembling.

Quick dismantling lock Spanclamps come in different materials and several styles for each application

Quick dismantling lock Spanclamps 

Handle and clamping arm position of vertical quick clamps flanged with Adjustable handle

1. High position of handle and clamping arm

The dotted line shows the high position.

The dimension H1 means the lowest arm position and it moves up by 5mm (clamping stroke). The arm can move up a little bit more but we recommend using the clamp within the clamping stroke.

2. Handle position
When you turn the handle, the clamping arm rotates synchronously.

The handle position of open condition can not be decided because it depends on the handle position of close (clamping) condition. You can change the handle position in both conditions.

See example in this video: