: One face of the nut is spherical. When paired with a matching conical washer, the nut can "tilt" slightly. Real-World Use
The DIN 6330 standard is essential for several reasons: din 6330 pdf
The most interesting part of the DIN 6330 (specifically Type B) isn't just its height—it’s its rounded bottom Aspen Fasteners The "Conical" Connection : One face of the nut is spherical