These classifications are mentioned on the manufacturer's product page and relate to the Type R rosin flux used

The manufacturer provides a product data sheet and installation/assembly instructions on its official website

3 µm according to manufacturer documentation)

Serie: 347

Forbindelsen bygger på MULTIL AM-kontaktteknologi

Bøsning forniklet SLB4-G/N-X sort Unit(s):Pcs These classifications are mentioned on. Insulated, rigid, 4 mm, accepting spring loaded 4 mm plugs with rigid insulating sleeve. Machined brass. Insulation material UL94 V 0. The socket is screwed into pre drilled panels of plastic, metal, etc. Threaded bolt M4 and soldering hole.