What's the strength of the spring washers? Clamping force of a quarter turn?
The cross pin of the carbon steel versions is made from wire DIN EN 10218-2/10270-1-DH-1.6, tensile.
The clamping forces of our systems are as follows:
- 2600/2700 series: 30N - 60N
- 4002 series: 150N - 250N
- 50F series: 350N - 380N
- 991F series: 50N - 500N
The 3D drawings always have the springs in the un-compressed position. For example, for the 50F-3700 N series, the belleville springs can compress 0.3mm.
Beware:
The clamping force is dependant on the thickness of the panels in the customer's application. The thicker the panels the bigger the clamping force will be.
The customer should always test this within the applciation.
If you need a guaranteed clamping force that is repeatable then we suggest the Spanclamps: https://anemo.eu/spanclamps
Question:
What are Working Load, Tensile Strength and Minimum Preload in a Quarter Turn Fastener
Answer:
On the catalogue you’ll see always the tensile strength of the quarter turn.
For the parts in the 50F series, this is 3700 N.
This means that you can pull on the quarter turn with a weight of around 370kg.
This mean the quarter turn can support the pull of a mass of around 370kg.
Having said that, this is for a static load.
For a dynamic load (this would be the maximum).
There is a safety factor of 30% before the system breaks (but that can depend on the application).
Beware, stainless steel parts have lower tension loads.
Important note:
Quarter turns are not designed to cope with side loads!
A quarter turn is not a product that will guarantee a certain clamp force.
We state 350 N; but this is not an official value!!!
As it all depends on the thickness of the panels.
Take care as in certain series (spring loaded, like 2600F) you can have the following issue:
https://anemo.eu/when-pulling-panel-receptacle%2C-what-size-gap-appears-between-both-my-panels