Clock Pendulum Suspension-Spring Information

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Clock Pendulum Suspension-Spring Information

The following is a discussion on clock pendulum suspension-spring information. Naturally, suspension springs do not have to be exact in length. If the clock runs slow, simply raise the pendulum bob with the rating nut at the bottom.

Likewise, if the clock is running fast then turn the rating nut to lower the pendulum bob.

Most common springs

By and large, suspension spring A is the most common style suspension spring. Of course, it is most likely the one by default.

If the old suspension spring looks similar to this one then it is right. As a general rule of thumb, small mantle clocks take suspension A1, wall clocks and small grandmother units will take suspension A2.

The A3 size is for grandfather clock units with a larger pendulum bob diameter.

This size can also be seen on Grandmother clocks with larger bob diameters. Use the larger A3 with large bob diameters so the bob will not wobble front to back.

If using a pendulum with a bob of 8 1/2 inch diameter or larger please order Suspension A3 for this reason.

Not as common

Urgos uses the single hook style as seen in picture suspension B. However suspension A was the very most common to use.

Very old antique round movements mainly use Suspension C and Suspension D. These are mainly French clocks and US made units made prior to 1945.

The content of this website is copyright by Clockworks and written by James Stoudenmire in year 2022

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2 years ago

Is there any difference in the thickness of the suspension spring?

2 years ago
Reply to  Sean

I have a Seth Thomas 124 movement

James T Chamberlain
1 year ago

I have a antique Morbier/ Comtoise 8″ pendulum clock.what suspension spring should I order?

Evan Stark
Evan Stark
3 months ago
Rating :

Now I know I need an A1 suspension spring, thank you.

2 months ago

What suspension spring should I use for a Seth Thomas mantel clock

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