Can anyone help identify an inductor marked AN 400

I was working on a circuit board that would lose power when jarred.  I traced the problem to an inductor that had a broken lead.  I managed to solder the bit of reamining lead to a piece of paper clip and get the unit running.  It is a control board for an autommatic cutoff saw, so it is subject to constant vibration while running.  I have not been able to determine the value of the inductor.  It is a black cylinder 0.478" (12.15mm) in diameter X 0.780" (19.82mm) tall.  It has AN 400 marked on the top, but that is the only markings.  I contacted the tech support department of the US branch for the manufacturer, but they do not have any details beyond the circuit board part number.  I would greatly appreciate any help that anyone can offer.  

Hi Loyd,

If you have access to an electronics lab, just measure the inductance. Finding any information with just that number will most likely prove impossible...

You can connect the inductor in series with a resistor of a known value and apply a sinusoidal signal across it. The amplitude of the signal between the two components will vary with frequency, so you can calculate the inductance based on the frequency response of the circuit. This link offers a decent explanation: http://www.wikihow.com/Measure-Inductance (I am refering to method 2).
Make sure you measure both the input signal and the signal between the components, your signal generator's output impedance can't be neglected (typically 50ohms)!

Good luck!

Thanks Felix.

Unfortunately I did not think of that while I had the inductor out, but it's kind of a moot point. I don't have access to a signal generator nor an o'scope. If it fails again, I will see if I can get hold of a scope and a function generator.

Thanks Again

A lot of DVMs have the ability to measure inductance. You will also need to know what current the inductor has to carry in use when matching it up with a new part,
cheers,
Richard