Size classes
Size classes are nominal, not exact: the class records the dimension a batch is sold as, together with the tolerance the producer can hold.
No size classes are published yet. A class is listed here only when verified product records actually ship in it, with the tolerance range measured rather than assumed.
How size is recorded
The database stores a nominal dimension in millimetres (diameter_mm) plus a free-text size class, so cube edges and round diameters can be described in the supplier's own terms without forcing them into a false numeric equivalence.
| Size class | Nominal dimension | Products | Notes |
|---|---|---|---|
| No size classes yet (3 entries) — data pending, supplier verification in progress. | |||
A nominal 25 mm or 26 mm cube means little without the deviation range and the sampling plan. See size tolerance for how this is measured and what to put in the purchase specification.