Construction typeArmDatum diameter12.2500 in, 311.15 mmMaterialCast ironNumber of grooves1.0000O.D. (in)12.2500 , 311.15 mm
| Construction type | Arm |
| Datum diameter | 12.2500 in, 311.15 mm |
| Material | Cast iron |
| Number of grooves | 1.0000 |
| O.D. (in) | 12.2500 , 311.15 mm |