Shaft Requirements
| BEARING MEDIUM | SHAFT REQUIREMENTS | |
| Hardness | Surface Finish | |
| PTFE Impregnated Bronze | Hard or Soft | 16 RMS Min. |
| SAE 840 Bronze | Min. hardness of 95 HRB (Rockwell B) | 16 RMS Min. |
| Delrin | Hard or Soft | 16 RMS Min. |
| Needle-Roller | Hardness of 58-64 HRC (Rockwell C) | 16 RMS Min. |