What is the stud length?
The stud length of a ¼-turn fastener is a dimensionless number that was invented to ensure a gradation of the different clamping thicknesses.
A stud length is ALWAYS series-specific, so it is not comparable among the series.
How do I calculate a stud length?
To connect two surfaces, we use the following terms:
P = panel thickness
F = frame thickness
In certain series, this results in our total clamping thickness G, which results in the sum of the two designations P and F.
This should not only be based on theoretical data, e.g. from a CAD system, as additional product refinements such as painting surfaces P and F on both sides can influence the total clamping thickness G.
An example:
With a panel thickness of 0.2mm with a double-sided coating of 0.1mm, the total layer thickness would grow to 0.4mm and actively influence the line length. Such information is not considered in CAD systems.
What must be considered in a stud length calculation?
Sheet thickness tolerances, coating thicknesses and finishing processes that lead to material thickening.
What is the ideal condition to measure the total clamp thickness G?
You can get the real dimension if you take a measurement with the desired panel thicknesses including priming / varnishing / foiling.
How do I choose my desired stud length with the catalog?
Once you have determined the total clamp thickness G, open the desired series in our Camloc catalog. Then choose the receptacle type that best meets your needs.
(Example: Series 50F, with retaining cam types 1, 2 or 3)
Now you have to go to the item "Stud length table". This point is located on the first two pages of the selected series.
Then you can use your information about the calculated total clamping thickness G and the selected receptacle type to determine your stud length number.
Attention! However, the total clamping thickness can be extended by additional components such as: gasket/lifting spring etc. or washer/spacer plates in conjunction with the receptacle. The dimensions of these components must be added to the total clamping thickness G.
However, this does not apply to the thickness of the retaining washer, as it is incorporated into the contour of the desired plate in a plate preparation. You can find more detailed details on the last page of a respective series in the catalogue.
Why can't I use the total length of the stud?
Measurements of the total length of the stud are not usable.
The reason for this is that stud blanks are used in production, which are chopped off to the desired stud length and thus the stud length can vary.
How do I recognise the length of a stud?
To identify the stud length, it is usually sufficient to simply look at the cone head. If you turn the pin to twelve o’clock, you can read the number.
Examples of stud length identification:
