Bearing NU 313 ZOAO

• The suffix “ZOAO” is a typo or non-standard code (a custom or local variant).

• The correct suffix might be something like C3, ECJ, ECM, XL, etc., which are common for variants of the SKF NU 313 type series.

• The bearing could be a re-branded or OEM version of the same basic NU 313 size.

Here’s a reference description for the standard NU 313 (from SKF) in case it aligns with what you need: