Introduction
Clock click springs are essential safety components that prevent the mainspring or weight system from unwinding uncontrollably. Choosing the wrong click spring leads to slipping clicks, dangerous unwinding, or a clock that won’t hold tension. This guide explains how to choose the correct click spring for your mechanical clock.
Understanding What Click Springs Do
Hold the click against the ratchet wheel
The click spring keeps the click engaged so the wheel cannot unwind.
Maintain safe winding tension
A properly sized spring ensures smooth, controlled winding.
Prevent catastrophic unwinding
If the click spring fails, the mainspring or weight system can release instantly.
How to Identify the Correct Click Spring
Match the spring style
Common styles include straight, curved, looped, and tab-mounted springs.
Check the spring strength
Too weak causes slipping; too strong causes binding or click wear.
Match the mounting method
Some springs screw into the plate; others hook, rivet, or press-fit.
Matching Click Springs to the Movement
Identify the movement manufacturer
Hermle, Urgos, and Kieninger use specific click spring shapes and mounting points.
Match the ratchet wheel size
Larger ratchet wheels require stronger springs to maintain engagement.
Check the click geometry
The spring must push the click at the correct angle for full tooth engagement.
Common Click Spring Materials
Hardened spring steel
Most common and ideal for long-term durability.
Tempered alloy springs
Used in high-load or high-tension applications.
Brass click springs
Less common but found in some antique movements.
Common Mistakes When Choosing Click Springs
Using a spring that is too weak
Causes slipping clicks and unsafe winding.
Using a spring that is too strong
Leads to click wear, binding, or broken mounting points.
Incorrect mounting style
Even a small mismatch prevents proper engagement.
Recommended Internal Links
- How to Choose the Correct Clock Ratchet Wheels
- How to Choose the Correct Clock Mainsprings
- How to Choose the Right Clock Arbors
- How to Test a Clock Train During Reassembly
FAQs
How do I know which click spring my clock needs?
Match the spring style, strength, and mounting method to the movement’s original design.
Can I bend a click spring to make it fit?
Minor adjustments are possible, but excessive bending weakens the spring.
Why does my click slip when winding?
The spring may be too weak or incorrectly positioned.
Can I replace a click spring without replacing the click?
Yes, as long as the click is not worn or damaged.
Do click springs from different brands interchange?
Only if the shape, strength, and mounting style match exactly.
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