| Center Type | Standard Spindle Diameter | Lbs. Thrust to Bottom Spring | Spring Travel | Over-all Taper Length | Overhang Gage Line to Spindle Point | Spindle Point to Housing | Radial Load Capacity in Lbs. |
|---|---|---|---|---|---|---|---|
| II | .378 | 120 | 3/32" | 3" | 1 3/8" | 7/8" | 1400 |
| III | .558 | 290 | 1/8" | 3 3/4" | 1 11/16" | 1 5/32" | 1850 |
| IV | .686 | 420 | 5/32" | 4 7/8" | 2 3/8" | 1 3/8" | 2500 |
| V | 1.075 | 780 | 3/16" | 6" | 2 7/8" | 2" | 3750 |
| VI | 1.509 | 1340 | 3/16" | 8 1/4" | 3 5/8" | 2 3/4" | 5500 |