Electromagnet magnetic field issue

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Zeusex
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Hi Guys
We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns.
What is possibly wrong? PIN and bracket are made of iron and are in electrical contact, exactly like the reference design.
Any help will be appreciated.
Thanks.
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