Threaded Companion Flanges

Flange is the broad category for components used to join, terminate, support, or provide access to piping systems. A companion flange generally refers to the matching flange used with another flanged component, such as a pipe, valve, or fitting. The term describes its connection role rather than a separate universal flange standard, so the exact design should be confirmed against the project specification.

Depending on the application and supplier terminology, a companion flange may be described as a mating flange or a matching flange. Threaded versions can also be identified by their connection method, such as threaded flanges. Because names can vary, buyers should confirm the flange type, nominal size, pressure class, facing, material, and applicable ASME or API requirements before ordering.

The diameter of a 2-inch flange depends on which diameter is being requested and which flange standard applies. Outside diameter, bolt-circle diameter, bore, and the mating pipe’s nominal size are different measurements. A complete specification should identify the applicable ASME or API standard, pressure class, flange type, and facing so the correct dimensional information can be provided.

Product information lists carbon steel, stainless steel, alloy steel, duplex, and nickel alloys among the available flange materials. The appropriate selection depends on the piping service, pressure and temperature conditions, corrosion exposure, welding or threading requirements, and project specifications. Twinco Industrial can help compare available material options for pipeline, testing, petrochemical, construction, and maintenance applications.

The listed flange inventory includes ASME B16 Series and API Standards. Product information also identifies ASME B16.5 and ASME B16.47 Series A and B standards, along with ASME pressure classes and API ratings. Buyers should verify the exact standard, class or rating, dimensions, facing, material, and documentation required for the specific threaded companion flange.

Twinco Industrial lists both rental and purchase options for its flange inventory. Rental can support hydrostatic testing, maintenance, shutdowns, and construction work where components are needed for a defined project. Purchase may suit recurring industrial piping or pipeline requirements. Availability and suitability should be confirmed using the required flange type, size, material, standard, pressure class, and quantity.