Carbon Steel Pipe Fittings

Carbon steel remains the workhorse for many hydraulic, pneumatic, and general fluid fittings when plating or paint will handle corrosion and cost must stay practical at volume. Hongqian produces carbon steel pipe fittings as OEM parts — adapters, plugs, bushings, unions, and custom CNC shapes — to approved prints rather than one fixed catalog geometry.

Typical grades include free-machining and structural carbons such as 1020, 1045, 12L14, 1215, and related stocks. Process route depends on volume: CNC bar for pilots and complex shapes; cold heading or hot forging plus secondary machining when annual demand justifies tooling.

Finish and inspection notes

Zinc, electroless nickel, black oxide, and specialized coatings are quoted against the service environment you describe. Thread standards (NPT, BSPP, BSPT, metric, UN) are read from the print and verified on the agreed gauge plan. Ask for MTR or dimensional reports when your PO requires them.

Request a quote with PDF + STEP files, or compare stainless options in our stainless category if corrosion risk is higher.

How OEM carbon programs usually start

Most carbon fitting transfers begin with a PDF print, a target first lot, and a note about plating. We confirm whether CNC bar or form-and-chase is the economical route, then return manufacturability comments with the quote. Repeat orders keep the same revision control so hex stock, thread gauges, and finish codes do not drift between shipments.

For assemblies that also need stainless lines, keep separate SKUs rather than forcing one metal across the catalog. That keeps cost honest and corrosion performance matched to each application.