This kind of KF flange specially used for vacuum processing fields.
The material could be requested made by stainless steel 304.
Features:
Material: SUS304
Size Range: KF16-KF50
Standard: Bored range (1/2"-2")
Please feel free to contact us if you are interested in.
We have a complete size and diversity on vacuum fittings.
The samples will be provided if needed.