are used to precisely center a fixture on a rotary table. They are used for mounting Quintus Quick-Change Risers. Riser Blocks, and Round Tooling Plates, which all have a standard 25mm center hole. To accomplish this, all Center Locating Keys have a 25mm upper diameter, but have one of four different designs so that the bottom diameter fits the rotary table's center hole. Made in USA.
| Material | Heat Treat | Finish | DFARS | RoHS |
| 1144 Steel | Heat Treated Rc 50-55 | Black Oxide | Yes | Yes |
| A Diameter Nominal (mm) | A Diameter Actual | B Diameter Nominal (mm) | B Diameter Actual | C | D | H |
| 30mm | 1.1811 | 25mm | 0.9843 | 0.91 | 0.98 | 0.59 |
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