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

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

MOQ:	1000 stuks
Prijs:	$0.5-2
Standaardverpakking:	houten kist
Leveringstermijn:	30 dagen
Betalingswijze:	T/T, D/P, D/A
Toeleveringskapaciteit:	2000BTU

Details Informatie

Productomschrijving

Detailinformatie

Plaats van herkomst

Qingdao, China

Merknaam

Qingdao Sande Tech Co.,Ltd

Certificering

ISO, DIN, AISI, ASTM, BS, JIS, etc.

Modelnummer

OEM

Maat:

Materiaal:

verpakking:

Sollicitatie:

Trefwoorden:

pakket:

Functies:

Materialen:

Productomschrijving

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.

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

MOQ:	1000 stuks
Prijs:	$0.5-2
Standaardverpakking:	houten kist
Leveringstermijn:	30 dagen
Betalingswijze:	T/T, D/P, D/A
Toeleveringskapaciteit:	2000BTU

Detailinformatie

Productomschrijving

Detailinformatie

Plaats van herkomst

Qingdao, China

Merknaam

Qingdao Sande Tech Co.,Ltd

Certificering

ISO, DIN, AISI, ASTM, BS, JIS, etc.

Modelnummer

OEM

Maat:

Materiaal:

verpakking:

Sollicitatie:

Trefwoorden:

pakket:

Functies:

Materialen:

Min. bestelaantal:

1000 stuks

Prijs:

$0.5-2

Verpakking Details:

houten kist

Levertijd:

30 dagen

Betalingscondities:

T/T, D/P, D/A

Levering vermogen:

2000BTU

Productomschrijving

CNC Precision Machined Extruded Aluminum & Stainless Steel Seamless Tubes

Product Overview

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.

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?

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

Tags: