Discount Tubing Manufacturers & Factory

Warping, ovality, and bore closure during CNC turning or boring stem from unrelaxed internal frozen stresses induced by rapid surface cooling during casting or extrusion. In poorly managed facilities, tubes are pulled quickly from molds to maximize line speed. At our factory, all cast nylon and polyacetal hollow bars undergo a secondary multi-cycle thermal annealing treatment in temperature-controlled liquid media. This holds the polymer chains at molecular relaxation temperatures, eliminating internal hoop stress and guaranteeing consistent straightness and dimensional retention during heavy cutting passes.

Specify Cast Nylon (PA6/MC) when maximum load capacity, impact resistance, and dynamic shock absorption are paramount, such as in crane sheaves, piling cushions, mining rollers, and heavy-duty slide bearings. Cast nylon also allows for economical custom mold casting of large outside diameters (up to 1,500 mm). Choose Polyacetal (POM-C) when operating in wet or submerged marine environments where moisture-induced hygroscopic swelling cannot be tolerated (water absorption is only 0.2% vs. 1.5% for nylon), and for tight-tolerance fluid metering sleeves and fine-pitch gears requiring exceptional dimensional precision.

When a finished part requires an internal bore (such as a bushing, flange sleeve, or guide collar), starting with a solid rod requires deep core drilling. This consumes significant machine run time, wears out carbide insert tooling, and turns up to 65% of the purchased polymer into scrap chips. Procuring custom-dimensioned hollow tubing provides near-net geometry. Your CNC centers can proceed immediately to semi-finish boring and OD turning passes, cutting spindle cycle times by up to 60%, reducing tool wear, and trimming net freight shipping weight.

Yes. In addition to standard metric and imperial tooling stock (OD 30 mm to 800 mm), our modular horizontal casting and continuous extrusion tooling allow us to manufacture custom OD/ID configurations on short lead times. We can compound polymer blends with solid lubricants like MoS₂ (black/grey), oil-impregnated blends (green), food-compliant virgin natural (ivory/white), and high-visibility safety blue, as well as fiber-reinforced or antistatic additives.

Polymers—particularly polyamides—are hygroscopic and can absorb airborne moisture during multi-week ocean transit across equatorial routes, which can cause slight dimensional swelling. To safeguard stock integrity, our export shipments are hermetically heat-sealed in thick polyethylene barrier film with desiccant packets, capped on tube ends with protective plastic guards to prevent edge chipping, and packed inside fumigated IPPC-stamped solid plywood crates or heavy-gauge steel strapped pallets.

Every production lot ships with complete traceability documentation, including: (1) Raw Material Mill Test Certificates specifying resin grade, melt flow index (MFI), and density; (2) In-house Inspection Test Reports (ITR) detailing OD/ID dimensional verification, roundness, and concentricity; (3) Non-Destructive Ultrasonic Void Test sign-offs; and (4) RoHS and REACH compliance statements. Third-party inspections via SGS, TÜV, or Bureau Veritas can also be coordinated prior to factory departure.