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CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
Specifications
Brand Name :
Qingdao Sande Tech Co.,Ltd
Model Number :
OEM
Certification :
ISO, DIN, AISI, ASTM, BS, JIS, etc.
Place of Origin :
Qingdao, China
MOQ :
1000pcs
Price :
$0.5-2
Payment Terms :
T/T,D/P,D/A
Supply Ability :
10000PCS/month
Delivery Time :
30 days
Packaging Details :
Wooden case
Capacity :
10, 000pieces per month
Means Of Transport :
Maritime transport
Production Method :
CNC Machining
Packingour Request :
wooden box
Durability :
High
Keywords :
machining part
Compatibility :
Marine vessels
Description
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes
Product Overview

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.

Available Materials & Specifications
Parameter Extruded Aluminum Tubes Stainless Steel Seamless Tubes
Common Grades 6061, 6063, 6082, 6005, 7075 TP304 / 304L, TP316 / 316L, 321, Duplex 2205
Standards ASTM B221, EN 755, GB/T 5237 ASTM A312, ASME SA213, EN 10216-5
Tube Type Seamless extruded (solid or hollow profile) Cold drawn seamless (CDS) or hot finished
OD Range 8 mm - 300 mm 6 mm - 219 mm
Wall Thickness 1 mm - 20 mm 0.8 mm - 15 mm
Length (as supplied) Custom cut from 50 mm to 6000 mm Custom cut from 50 mm to 12000 mm
Surface Condition Mill finish, anodized, or machined Annealed & pickled, bright annealed, polished
CNC Machining Capabilities
Operation Description
Precision Turning OD/ID turning, stepped diameters, taper, chamfer, radius
Milling Flat faces, slots, keyways, hex flats, C-rings
Drilling & Boring Cross-holes, axial deep holes, counterbores, tapped holes
Threading Internal / external threads, NPT, BSP, metric
End Finishing Square cut, deburred, grooved, flanged, beveled for welding
Surface Refinement Polishing (Ra ≤ 0.4 μm), honing (ID), anodizing (Al), passivation (SS)
Tolerance Diameter: ±0.01 mm, Length: ±0.05 mm, Concentricity: ≤0.02 mm
Key Features & Benefits
✅ Seamless Integrity - No weld seam means higher pressure rating, better fatigue life, and no risk of weld corrosion (especially for stainless steel).
✅ CNC Precision - Tight tolerances and machined features ensure direct fit into assemblies without rework.
✅ Material-Optimized Performance
  • 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)
✅ One-Stop Manufacturing - From extruded or seamless tube blank to fully machined finished part, reducing supplier management and logistics cost.
✅ Customizable End Conditions - Ready for welding, threading, press-fit, or O-ring sealing.
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
Quality Control & Testing
  • 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
Ordering & Customization Options

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)
Packaging & Delivery
  • 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)
Why Choose Our CNC Machined Tubes?
  • 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, TÜV, or customer's own inspector
Example of Finished CNC Machined Tube Components
Component Material Machined Features
Pneumatic cylinder barrel 6063 aluminum tube ID honed, both ends threaded, O-ring groove
Hydraulic manifold spool 316L seamless tube OD turned with stepped diameters, cross-drilled ports
Heat exchanger tube TP304 seamless tube End beveled for welding, outer surface polished
Sensor housing sleeve 6061 aluminum tube Milling of flat face, axial and radial threaded holes
Frequently Asked Questions (FAQ)
1. What is the difference between extruded aluminum tubes and stainless steel seamless tubes?
Aspect Extruded Aluminum Tubes Stainless Steel Seamless Tubes
Manufacturing process Forced through a die (extrusion) Rotary piercing and cold drawing (seamless)
Seam No seam (extruded as hollow) No seam - true seamless
Strength Moderate (lightweight) High (heavy-duty)
Corrosion resistance Good (improved by anodizing) Excellent (especially 316L for marine/chemical)
Weight Light (≈1/3 of steel) Heavy
Thermal conductivity Very high Low
Cost Lower Higher
2. Can you provide custom lengths and machining on both materials?

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.

3. What tolerances can you hold on machined tubes?
Feature Typical Tolerance Precision Capability
Outer diameter (OD) after turning ±0.02 mm ±0.01 mm
Inner diameter (ID) after boring/honing ±0.02 mm ±0.01 mm
Length ±0.10 mm ±0.05 mm
Concentricity (OD to ID) 0.05 mm 0.02 mm
Thread class 6H / 6g 4H / 4g
4. Do you supply tubes with anodizing or passivation?
  • 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.
5. What standards do your stainless steel seamless tubes meet?

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.

6. Can you machine threads, grooves, or cross-holes on thin-wall tubes?

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
7. What is your minimum order quantity (MOQ)?
Order Type Aluminum Tubes Stainless Steel Tubes
Prototype / Sample 1-10 pcs 1-10 pcs
Small batch 50-200 pcs 30-100 pcs
Mass production ≥500 pcs ≥200 pcs

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.

8. How do you package machined tubes for export?
  • 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
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CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components

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Product Detail
Brand Name :
Qingdao Sande Tech Co.,Ltd
Model Number :
OEM
Certification :
ISO, DIN, AISI, ASTM, BS, JIS, etc.
Place of Origin :
Qingdao, China
MOQ :
1000pcs
Price :
$0.5-2
Contact Supplier
video
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components
CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes for Ready-to-Install Components

Qingdao Sande Technology Co., LTD

Verified Supplier
2 Years
shandong, qingdao
Since 2018
Business Type :
Manufacturer, Exporter, Trading Company, Seller
Main Products :
Hot Forging Parts, Steel Forging Parts, Aluminum Forging Parts
Employee Number :
>63
Certification Level :
Verified Supplier
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