This is the same nickel-plated brass hex nut as supplied with our toggle switches. Fits any switch with a standard 15/32-32 threaded mounting bushing. Sold individually.
This nut can also be used as the retaining nut for the Camloc 99F Series Receptacle for 2600/2700 Quarter-Turn Studs (Part No. 6091-001, sold separately.
You may find other nuts in the same size that are stamped out of sheet steel, with a hollow (U-shape) profile and just one bearing face. Ours are solid, with a bearing face on both sides.