ISO (JIS) equivalent
To facilitate smooth replacement from ISO bearings, we provide bearing numbers “ISO equivalent” within our product lineup, referring to JIS B 1512 (Rolling bearings – Boundary dimensions) and JIS B 1513 (Bearing designation), which are based on ISO 15 standard.
Accordingly, please note in advance that the bearings listed in this catalog are not compliant with ISO or JIS standards.
Even for outer races with shapes other than flat type, the ISO-equivalent size is shown based on the outer diameter D.
For wide inner-race types, the ISO- equivalent size is shown based on the main body dimensions excluding the wide sections C and C1.
This specification was introduced to meet customer requests to omit washers previously used to prevent contact between the bearing side face and the mating part.
Components of product name
If you would like to know more about the meaning of the product name codes, please see the configuration of part numbers.
| No | Item | Symbol | Meaning |
| ① | Outer race material symbol | ID | Polyacetal (Carbon steel insert bearing) |
| ② | Outer race shape symbol | （R） | Flat *Omitted |
| ③ | Retainer or full ball type | S | Full ball |
| ④ | Outer race outer diameter | – | (Numerical ΦD dimension shown in drawing) |
| ⑤ | Ball material symbol | Omitted | Carbon steel ball |
| ⑥ | Inner race shape symbol | H | Inner ring |
| ⑦ | Inner race material symbol | Omitted | Carbon steel (Plating) |
| ⑧ | Bore and clearance dimension for mounting | – | (Numerical Φd/C dimension shown in drawing) |
| W | Inner race width (Wide type) & C/C1 dimension | ||
| ⑨ | Additional information | NC2 | Inner race chamfer (C2) *Side only |
*All products are basically made to order, but some items may be in stock. Please contact your distributor or dealer for availability.
