Qingdao Sande Technology Co., LTD
| Payment Terms | D/P,T/T,Western Union |
| Supply Ability | 10000PCS/month |
| Delivery Time | 30 days |
| Packaging Details | Wooden case |
| Lead Time | 30-40days |
| Plating | Zinc |
| Durability | long-lasting |
| Product_Name | Machining Parts |
| Strength | high strength |
| Surface | Anodized |
| Brand Name | Qingdao Sande Tech Co.,Ltd |
| Model Number | OEM |
| Certification | ISO, DIN, AISI, ASTM, BS, JIS, etc. |
| Place of Origin | Qingdao, China |
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Product Specification
| Payment Terms | D/P,T/T,Western Union | Supply Ability | 10000PCS/month |
| Delivery Time | 30 days | Packaging Details | Wooden case |
| Lead Time | 30-40days | Plating | Zinc |
| Durability | long-lasting | Product_Name | Machining Parts |
| Strength | high strength | Surface | Anodized |
| Brand Name | Qingdao Sande Tech Co.,Ltd | Model Number | OEM |
| Certification | ISO, DIN, AISI, ASTM, BS, JIS, etc. | Place of Origin | Qingdao, China |
| High Light | Precision Machining Seamless Rectangular Tubes ，CNC Machining Seamless Rectangular Tubes ，CNC Round Hole Steel Tubes | ||
CNC precision machining of seamless square tubes/round hole steel tubes
Product Description
We specialize in high-precision CNC machining of seamless thick-walled steel tubes with outer square and inner round profiles, designed for structural, mechanical, and industrial applications. Our advanced machining capabilities ensure tight tolerances, superior surface finishes, and complex geometries for custom tube components.
✔ Premium Material Selection
Carbon Steel (Q235, 20#, 45#)
Alloy Steel (4140, 4340)
Stainless Steel (304, 316)
Aluminum & Other Metals (Upon Request)
✔ Precision CNC Machining Capabilities
Tolerances: ±0.05mm (Standard) | ±0.02mm (High Precision)
Wall Thickness: 3mm–50mm (Customizable)
Outer Square Sizes: 20mm×20mm – 300mm×300mm
Inner Round Bore: Ø10mm–Ø250mm
Surface Finish: Ra 0.8–3.2μm (Grinding/Polishing Available)
✔ Machining Services
Drilling & Boring – Precision hole machining for fittings and assemblies
Milling & Grooving – Custom slots, keyways, and threads
Cutting & Deburring – Smooth edges for safety and functionality
End-Facing & Chamfering – Ready-to-install tube ends
✔ Customization & Rapid Prototyping
Tailored Dimensions – Adjustable length, wall thickness, and bore size
Secondary Processing – Heat treatment, galvanizing, powder coating
Fast Turnaround – Prototypes in 5–7 days | Production in 10–20 days
✔ Quality Assurance
100% Dimensional Inspection (CMM, Laser Measurement)
Material Certification (MTC, SGS, EN 10204-3.1)
Non-Destructive Testing (UT, Eddy Current)
Product parameters :
1. Basic Parameters
| Parameter | Specification |
|---|---|
| Material | 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) |
2. 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 |
3. Performance & Testing
| 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 |
4. Customization & Logistics
| 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) |
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
Why Choose Us?
✅ Advanced CNC Equipment – Multi-axis machining centers & lathes
✅ Engineer Support – DFM optimization & CAD/CAM assistance
✅ Competitive Pricing – Cost-effective for both prototypes & bulk orders
✅ ISO 9001 Certified – Reliable quality control
Company Details
Business Type:
Manufacturer,Exporter,Trading Company,Seller
Year Established:
2018
Employee Number:
>63
Ecer Certification：
Verified Supplier
Qingdao Sande Technology Co., Ltd. is located in Qingdao. We are specialized in manufacturing forging, CNC machining and various surface treatments. We have over 16 years of experience.We have a professional and experienced team of engineers, advanced production and testing equipment, a powerful qua... Qingdao Sande Technology Co., Ltd. is located in Qingdao. We are specialized in manufacturing forging, CNC machining and various surface treatments. We have over 16 years of experience.We have a professional and experienced team of engineers, advanced production and testing equipment, a powerful qua...
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