| Table1 Titles/Units of each parts | |||
|---|---|---|---|
| Symbol | Title | Symbol | Title |
| DL | （up raceway）Diameter of central raceway | n | No. Mounting holes |
| DW | （up raceway）Dimension of ball/roller | n1 | No. grease nozzle |
| D1 | External Ring P.C.D | dn1 | Diameter of External mounting holes |
| D2 | Internal Ring P.C.D | dn2 | Diameter of Internal mounting holes |
| D | Nominal OD | dm1 | Diameter of External thread mounting holes |
| d | Nominal ID | dm2 | Diameter of Internal thread mounting holes |
| d1 | External ring ID | L | Thread length of mounting holes |
| D3 | External ring OD | da | addendum circle diameter |
| H | Total height | m | Modules |
| H1 | Height of Internal/External ring | x | overlap arc of gear |
| h | Altitude different of Int/Ext ring | z | No. of teeth |
| DS | depth of hardened layer | b | Width of teeth |
