Choosing a telescope for a strap or bracelet – what needs to be measured?
2026-08-11Watch telescope connects the strap or bracelet to the case. When selecting it, not only the length matters, but also the diameter of the case, the type of ends, and the mounting construction. We explain what to measure before purchasing and when a standard telescope may not fit.
The spring bar is a small component, but it is responsible for securely connecting the watch to the strap or bracelet.
See spring bars for watches available at Hurtownia Kurant
How does a watch spring bar work?
Inside the spring bar, there is a spring that pushes its ends outward. The ends fit into the holes located in the lugs of the case.
This allows the strap to be attached without using permanent screws or rivets.
What parameters of the spring bar should be checked?
- length,
- diameter of the body,
- diameter of the ends,
- shape of the ends,
- spring's working range,
- mounting method.
How to choose the length?
The starting point is the width of the mounting area between the lugs of the case.
The ends of the spring bar must fit deep enough into the holes, but the body must not be so long that it prevents the spring bar from being compressed during installation.
Is the size of the spring bar the same as the width of the strap?
Often the values are similar, as the strap occupies the space between the lugs. However, the spring bar should not be selected automatically based solely on the strap's marking.
It is best to compare the old spring bar and measure the case.
Why is the diameter of the spring bar important?
Thicker spring bars can provide greater rigidity of the connection, but they may not fit into every strap or the final link of the bracelet.
A spring bar that is too thin may have excessive play in the strap or bracelet hole.
Standard or specialized spring bar?
In most classic watches, spring bars with a simple construction are found.
However, there are also:
- spring bars with increased diameter,
- versions with shorter or longer ends,
- internal spring bars,
- automatic spring bars that allow removal without tools,
- designs intended for specific cases.
The store offers both classic and specialized versions of spring bars. :contentReference[oaicite:2]{index=2}
What are quick-release spring bars?
These spring bars have a small lever protruding through a hole in the strap. Moving it with a finger allows you to compress the spring bar and remove the strap without a traditional tool.
However, the strap must be prepared for this type of construction.
How to check an old spring bar?
Before reusing, check:
- whether it is straight,
- whether the ends move smoothly,
- whether the spring rebounds,
- whether the ends are not worn,
- whether the body is not corroded.
When should a spring bar be replaced?
Replacement is advisable when the spring bar is bent, corroded, has a damaged spring, or its ends do not lock properly in the case.
It is not worth risking losing the watch due to a worn component of little value.
How to safely install a spring bar?
One end should be placed in the hole of the case, and the other should be compressed with the appropriate tool and carefully slid between the lugs.
After installation, gently pull the strap and check if both ends have properly entered the holes.
Common mistakes
- choosing only by length,
- ignoring diameter,
- using a bent old spring bar,
- installing the end next to the hole instead of in the hole,
- putting a too thick spring bar into a thin strap,
- using a random spring bar in a heavy bracelet.