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.

| Stainless Steel | |||||
| Material | Heat Treat | Finish | DFARS | RoHS | |
| 300-Series Stainless Steel | - | Passivated | โ | โ | |

| Thread Size | Hex (Inch) | A Diameter (Inch) | B (Inch) | C Diameter (Inch) | R (Inch) |
| 1/4-20 | 1/2" | 5/8" | 15/32" | 5/16" | 3/4" |