It is a black nylon / metal nut, namely bi-material black nylon / zinc-plated steel. This is the BPF 60 model. Indeed, this molded nut in black nylon on is made up of ribbed rectangular lugs 41 mm long by 20 mm.
Easy to assemble and disassemble Easy to unscrew, thanks to its two small ears on the head.
Its bi-material side gives it superior strength.
The wings of this wing nut are easy to hold and can therefore be used without tools. This ease of use makes it possible for the wing nut to be used in any type of assembly.