| No |
Item |
Symbol |
Meaning |
| ① |
Outer race material symbol |
A |
Carbon steel (Plating) |
| ② |
Outer race shape symbol |
（R） |
Flat *Omitted |
| ③ |
Retainer or full ball type |
Omitted |
Retainer (Polypropylene) |
| 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 |
Omitted |
| ⑧ |
Bore and clearance dimension for mounting |
– |
(Numerical Φd/C dimension shown in drawing) |
| ⑨ |
Additional information |
2/5 |
Identification number |
| 3.5R |
Numerical R dimension shown in drawing |
