Precision CNC Machined Seamless Square Tubes with Round Bore - 20-300mm Outer Size, 3-50mm Wall Thickness
Price:
$0.5-2
MOQ:
1000
Delivery Time:
30 days
Brand:
Qingdao Sande Tech Co.,Ltd
Product Description
Precision CNC Machining Services
We provide high-precision CNC machining for seamless thick-walled steel tubes featuring outer square profiles with precision inner round bores. Our advanced manufacturing capabilities deliver tight tolerances, superior surface finishes, and complex geometries for custom industrial components.
Material Selection & Specifications
| Parameter | Specification |
|---|---|
| Materials | Carbon Steel (Q235, 20#, 45#), Alloy Steel (4140, 4340), Stainless Steel (304, 316), Aluminum |
| Outer Shape | Square, Rectangle (Custom Profiles Available) |
| Inner Shape | Precision Round Hole |
| Outer Size Range | 20mm × 20mm - 300mm × 300mm |
| Inner Diameter | Ø10mm - Ø250mm |
| Wall Thickness | 3mm - 50mm (Adjustable) |
| Length | 50mm - 6000mm (Custom Lengths Supported) |
Machining Capabilities
| Process | Tolerance | Surface Finish (Ra) |
|---|---|---|
| CNC Drilling/Boring | ±0.05mm | 1.6-3.2μm |
| CNC Milling (Slots/Keyways) | ±0.03mm | 0.8-1.6μm |
| Threading (Metric/UNC) | ±0.02mm | 1.6μm |
| Cutting & Deburring | ±0.1mm | 3.2μm (Smooth Edge) |
| End-Facing/Chamfering | ±0.05mm | 1.6μm |
Performance & Quality Standards
| Property | Standard | Testing Method |
|---|---|---|
| Straightness Tolerance | ≤0.1mm/m | Laser Measurement |
| Roundness Tolerance | ≤0.05mm | CMM Inspection |
| Hardness (HRC) | 20-55 | Rockwell Test |
| Pressure Resistance | 10-50MPa | Hydrostatic Test |
| Salt Spray Resistance | 500-1000h | ASTM B117 |
Customization Options
| Option | Details |
|---|---|
| Coatings | Galvanized, Powder Coated, Anodized (Aluminum) |
| Marking | Laser Engraving, Dot Peen |
| Certifications | ISO 9001, EN 10204-3.1, RoHS |
| Prototype Lead Time | 5-7 Days |
| Mass Production | 10-20 Days (MOQ: 100pcs) |
| Packaging | PVC Wrapping + Wooden Crates (Export Standard) |
Industrial Applications
- Construction & Architecture - Structural frames, railings, support columns
- Machinery & Automation - Hydraulic cylinders, linear guides, robotic arms
- Energy & Oil/Gas - Pipeline systems, pressure vessels
- Transportation - Chassis components, roll cages
Manufacturing Advantages
Advanced CNC Equipment - Multi-axis machining centers & lathes
Engineering Support - DFM optimization & CAD/CAM assistance
Competitive Pricing - Cost-effective for both prototypes & bulk orders
ISO 9001 Certified - Reliable quality control systems
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Qingdao Sande Technology Co., LTD
Location
South Building, China-South Korea Maker Industrial Park, Chengyang District, Qingdao City, Shandong Province
Contact Person
tian