Okno – coating
- ZN – Zinc plating, galvanizing: (yellow, blue/grey, olive, white)
- H.D.G – Hot dip galvanizing
- PTFE/Xylan/Teflon (1070, 1080, 1084, 1088, 7530… blue, grey, black, red, green)
- Molykote
- Phosphate
- Manganese phosphate
- Nickel, Zinc-Nickel
- Sand blasting
- Nitridation, cementation
- Laser surface quenching
- Zinc flake
