GASKET, KLNGR C4401, 6.000" 150# FF

The 13850FF125A0600FC is a green Klingersil C-4401 Class 150 full face Flange Gasket measuring a 6 inch nominal pipe size, a Class 150 pressure rating, and a thickness of 0.125 inch. This flange gasket fills the microscopic imperfections in flange faces so the joint holds pressure. Source specification: NPS, 0.125 THK.

This material stands up to hydrocarbons, a broad range of process chemicals, and elevated flange loads. That behavior comes from the compound itself: Klingersil C-4401 offers consistent thickness and density across the sheet, reliable sealing on flanges with modest surface finish. It is not the right choice where service beyond the published pressure-temperature envelope or strong oxidizing acids in some grades are present.

Maintenance and OEM teams specify it across steam and hot water systems, pulp and paper, and power generation.

13850FF125A0600FC ships individually. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.