# S625ZZ Versus S623ZZ and S624ZZ — Size Mix-Ups to Avoid

The S62x miniature series is numbered tightly, and boxes get mixed in a drawer. S625ZZ is 5×16×5 mm. S623ZZ is 3×10×4 mm. S624ZZ is 4×13×5 mm. Only the first of those three belongs on this page.

If the housing already exists, measure bore, OD, and width. A 4 mm shaft with a 13 mm bore is S624 territory, even if someone wrote “625” on the bin. All three may be stainless and shielded; the size still has to match.

The S625ZZ bearing listing from TFL Bearing keeps S625ZZ isolated. Shandong TFL Bearing Co., Ltd notes the neighboring sizes so purchasing does not “fill in” with a close number.