| Dimensions (metric) | d | 8 | 
Open |
| D | 16 | ||
| B | 4 | ||
| Approx. Wgt. lbs |
.0070 | ||
| Interchange | ADR | - | |
| ISC | 688h | ||
| NMB | SSL-1680 | ||
| NTN | F688 | ||
| RMB | UL816X | ||
| SKF | W618/8 | ||
|
1) Outer races, inner races and balls are manufactured from 440C or equivalent stainless steel. They are through hardened to a hardness of 55-57RC. 2) The cages are manufactured from 304 or equivalent stainless steel. | |||
