Norton's 1600 series closers includes both models 1600 and 1601.
The 1601 is more popular since it includes a fully adjustable spring. It is more adaptive in the field.
This is why the series is more commonly referred to as the 1601 Series.
Bolt hole spacing is critical information if you are replacing an existing closer.
The Norton 1600 series is the industry standard, and the bolt hole spacing is copied by many other brands.
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