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CNC Machining Services - Custom Precision Parts Manufacturing
We understand that "precision machining" is a common claim among suppliers, but many struggle to maintain ±0.05mm tolerances on simple brackets. At Sinbo Precision, we deliver real precision. Established in 2003, our 34,000 square meter facility in Dongguan houses 50+ CNC machining centers including 3-axis, 4-axis, and 5-axis mills, CNC automatic lathes, and precision grinding equipment. We handle everything from single prototypes to 100,000-piece production runs with JIT scheduling.
Our standard tolerance capability is ±0.01mm across all operations, with tighter tolerances down to ±0.005mm available for critical features like bearing bores, seal faces, and precision fits. Every order includes CMM inspection on first articles and dimensional reports.
We machine a comprehensive range of materials including aluminum (6061, 7075, 5052), stainless steel (304, 316, 17-4 PH), titanium (Ti-6Al-4V), brass, bronze, copper, and engineering plastics (PEEK, Delrin, Nylon, POM). Surface treatments are coordinated through certified suppliers offering anodizing, plating, powder coating, polishing, passivation, and heat treatment—all RoHS and REACH compliant with full documentation.
Key Features
Prototype to Production in One Shop: 1-piece rapid prototyping (3-7 days) scales directly into production volumes without switching suppliers or re-qualifying
50+ Materials Available: Aluminum, stainless steel, titanium, brass, copper, PEEK, Delrin, Nylon, ABS, and specialty alloys with material test certificates for every batch
3/4/5-Axis Milling + Turning: Complex geometries with undercuts and compound angles handled in single setups on 5-axis machines with large-format capacity up to 1500mm x 800mm
Free DFM Analysis: Every project receives complimentary design review with tolerance conflict identification and cost-saving geometry suggestions
Full Quality Documentation: CMM reports, first article inspection, material test certificates, CoC, and RoHS/REACH compliance documentation included with every shipment
20+ Years, 5,000+ Customers: Established 2003 with parts shipped to over 50 countries
Real Equipment, Real Capacity: 50+ operational machining centers including large-format 5-axis machines and high-speed production mills
Quality System That Actually Works: CMM inspection, first article inspection, 100% dimensional checks, full material traceability with IATF 16949 certification
Honest Lead Times: 3-7 days for prototypes means 3-7 days with upfront communication about any delays
Transparent Pricing: Factory-direct with detailed cost breakdown and no hidden charges
One Roof: DFM analysis, prototyping, machining, surface treatment, assembly, testing, packaging, and shipping handled through single contact
Manufacturing Process
Quotation & DFM Review: Submit drawings (STEP, IGS, SLDPRT, PDF, DWG, DXF) for detailed quotation within 24 hours with free DFM analysis
Material Procurement: Certified materials with full traceability and material test certificates for every batch
Precision Machining: CNC milling and turning with in-process quality checks at critical dimensions
Quality Inspection: CMM measurement, first article inspection, surface roughness testing, and visual inspection on every order
Surface Treatment: Anodizing, plating, powder coating, polishing, heat treatment through certified sub-suppliers with full documentation
Packaging & Shipping: Custom protective packaging, documentation package, worldwide shipping via DHL/FedEx/UPS or sea freight
Frequently Asked Questions
What file formats do you accept?
STEP, IGS, SLDPRT, PDF, DWG, DXF, and X_T. Send whatever you have - we'll work with it.
What is your minimum order quantity?
1 piece for prototyping. Production MOQ is typically 100 pieces, flexible for growing programs.
What tolerances can you achieve?
Standard: ±0.01mm. Tighter tolerances to ±0.005mm available for critical features and precision bearing interfaces.
Do you provide material certificates?
Yes. Material test certificates with chemical composition and mechanical properties for all materials, at no extra cost.
What is the typical lead time?
Prototype (1-100 pcs): 3-7 days. Small batch (100-1,000): 7-15 days. Mass production (1,000+): 15-25 days.
Can you handle complex 5-axis parts?
Yes. Contoured surfaces, undercuts, compound angles, multi-feature parts in single setups. That's what our 5-axis centers are built for.
What payment terms do you accept?
T/T (wire transfer), PayPal, Western Union. Standard: 50% deposit, 50% before shipment.
