Combination nut and washer that compensates whenever a stud and clamping surface are not exactly perpendicular. Heavy-hex nut, similar to a Flange Nut, except with a convex spherical radius underneath. The washer has a matching concave spherical radius. Made in USA.

| Steel | |||||
| Material | Heat Treat | Finish | DFARS | RoHS | |
| 1215 Steel | Carburized-Hardened | Black Oxide | โ | โ | |

| Thread Size | Thread Pitch (mm) | Hex (mm) | A Diameter (mm) | B (mm) | C Diameter (mm) | R (mm) |
| M16 | 2mm | 24mm | 35mm | 25mm | 17.5mm | 44.5mm |