CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components

Our CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes combine high-quality raw tube profiles with advanced CNC machining to deliver ready-to-install components. Starting from extruded aluminum tubes (6061, 6063, 6082) or cold-drawn stainless steel seamless tubes (TP304, TP316L, duplex), we perform precision turning, milling, drilling, threading, and end finishing to your exact specifications.

The result: seamless tubes with machined features such as grooves, flanges, threads, chamfers, cross-holes, or stepped diameters - eliminating secondary assembly and ensuring drop-in readiness for hydraulic systems, pneumatic cylinders, structural frames, heat exchangers, and instrumentation lines.

• Aluminum: Lightweight, high thermal conductivity, corrosion resistant (ideal for heat sinks, frames, pneumatic tubes)
• Stainless Steel: High strength, excellent corrosion resistance (chloride / acid environments), high temperature capability (up to 800°C for 316L)

• Dimensional inspection - CNC probe, CMM, optical comparator, plug/ring gauges
• Material verification - Mill test certificate (EN 10204 3.1), PMI (positive material identification) for stainless steel
• Pressure testing - Hydrostatic or pneumatic test for seamless tubes (per ASTM A312)
• Surface finish - Profilometer (Ra), borescope for ID inspection
• Coating / anodizing thickness - Eddy current or magnetic gauge
• Leak test - Air under water for threaded or sealed components

To provide a precise quotation, please specify:

• Material grade (e.g., 6063 aluminum or TP316L stainless steel)
• Tube dimensions: OD * ID * wall thickness * length
• CNC machining drawing (PDF or DXF/DWG)
• Surface treatment requirement (anodized, passivated, polished, as-machined)
• Quantity (prototype, small batch, or mass production)
• Any certifications required (ISO 9001, PED 2014/68/EU, NORSOK, 3.1 certificate)

• Protection - Individual plastic caps on machined ends, bubble wrap, anti-rust paper (for stainless steel only - aluminum does not rust)
• Bundling - Steel banded wooden crates or shrink-wrapped pallets
• Labeling - Part number, material, batch traceability code
• Lead time - 40-60 days for custom machined tubes (depending on complexity & quantity)
• Port - Shanghai / Ningbo / Qingdao (or as requested)

• Dual material expertise - We understand the different machining behaviors of aluminum (gummy, high speed) vs. stainless steel (tough, needs rigid setup)
• Seamless tube sourcing + in-house CNC - No middleman; we control both raw material quality and final machining accuracy
• Short lead time for prototypes - As fast as 30 days for simple machined tube components
• Third-party inspection accepted - SGS, BV, TV, or customer's own inspector

Yes. We supply tubes in custom cut lengths (from 50 mm to 6000 mm for aluminum; up to 12000 mm for stainless steel). After cutting, we perform CNC turning, milling, drilling, threading, grooving, and end finishing according to your drawing.

• For aluminum tubes: Yes - clear anodizing, hard anodizing (Type III), or color anodizing available. Anodizing improves surface hardness and corrosion resistance.
• For stainless steel tubes: Yes - passivation per ASTM A967 removes free iron and restores chromium oxide layer for maximum corrosion resistance. Electropolishing also available for ultra-smooth, sanitary surfaces.

We supply to:

• ASTM A312 / A213 - Seamless austenitic stainless steel pipe/tube
• ASME SA312 / SA213 - Boiler and heat exchanger tubes
• EN 10216-5 - Seamless stainless steel tubes for pressure purposes
• NORSOK M-650 (upon request) - For oil & gas applications

Mill test certificates (EN 10204 3.1) are provided with each batch.

Yes, but with precautions. For thin-wall tubes (wall thickness < 2 mm):

• We use support mandrels or soft jaws to prevent deformation
• Threads are typically rolled (stronger) rather than cut
• Cross-holes are drilled with peck drilling and low feed rates

For custom extruded aluminum profiles (new die), MOQ is typically 500-1000 kg. For seamless stainless steel tubes from stock, no MOQ on cut-to-length.

• Individual protection: Plastic end caps on machined threads or bores; bubble wrap or foam sleeve
• Bundling: Steel banded wooden crates or shrink-wrapped pallets
• Anti-rust: For stainless steel only - anti-rust paper and VCI bags (aluminum does not rust)
• Labeling: Each part labeled with material, batch number, and inspection stamp