About the Client

Our client is a Poland-based manufacturer of industrial machinery, automation equipment, and precision positioning systems, serving clients across Europe. They specialize in mechanical pressing and locating components that require tight tolerances, excellent corrosion resistance, and burr-free edges for smooth assembly.

Due to increasing demand from their European customers, they needed a reliable CNC partner in China who could deliver consistent quality, fast turnaround, and competitive pricing — but previous suppliers had caused delays and quality issues with stainless steel bushings.

They specifically required SUS303 press bushings with consistent dimensions and burr-free finishing for high-volume assembly.

The Challenge

The client was facing several challenges with their existing supply chain:

• Multiple suppliers, inconsistent quality: They had contacted 5+ CNC shops in China, but samples varied in dimensions, concentricity, and edge quality, especially on SUS303 turned bushings.
• Long sample lead times: Some suppliers took 10–15 days just to send a sample, delaying their project timeline and customer deliveries.
• Risk of assembly issues: Their machinery assembly lines depended on these precision press bushings, and any burrs or sharp edges would cause fitting problems, surface scratches, or costly rework.

They needed a supplier who could prove capability quickly through a high-quality SUS303 sample and scale up production reliably for batch orders.

Why They Chose Us

Before placing the sample order, the client evaluated us based on:

• Technical capability: We provided detailed DFM feedback on their drawing, suggesting optimizations for SUS303 CNC turning, including toolpath strategies, chamfer design, and deburring methods.
• Fast response: All inquiries were answered within 2 hours via WhatsApp and email, with clear technical explanations.
• Transparent process: We shared photos of the sample during machining and provided a full inspection report (CMM data, concentricity test, edge quality verification under 20× microscope).

After reviewing our quotation and sample timeline, they decided to proceed with us for the prototype.

The Solution

SUS303 Press Bushings Sample Production (5 Days)

• Material: SUS303 (AISI 303) stainless steel — free-machining grade with sulfur additions for ~30% faster cutting than 304, ideal for high-volume turned bushings
• Tolerance: ±0.01mm on ID/OD, concentricity ≤0.02mm for smooth press-fit and locating function
• Process: CNC turning (roughing + finish turning) in a single setup to ensure concentricity, followed by precision deburring and edge breaking (all sharp edges removed per drawing requirements)
• Post-processing: Ultrasonic degreasing and cleaning to remove cutting fluids and oil residues, ensuring clean surfaces for passivation and assembly
• Quality control: 100% dimensional inspection using CMM and bore gauges, edge quality verified under 20× microscope, surface condition checked for oil-free, burr-free finish

We shipped the sample via DHL Express, and the client received it within 3 days.

Batch Order (8,000 Pieces in 14 Days)

• Upon sample approval, the client immediately placed an order for 8,000 pieces.
• We set up a dedicated production line with custom soft jaws to prevent surface marks on SUS303 bushings.
• Each bushing underwent CNC turning, deburring (all edges broken to 0.1–0.2mm chamfer), and ultrasonic degreasing.
• Parts were individually wrapped in foam-lined boxes to protect OD and bore from scratches during shipping.
• Optional citric acid passivation (ASTM A967) available upon request to enhance corrosion resistance for demanding industrial environments.
• Total production lead time: 14 days from order confirmation to shipment.

The Results

• ✅ Sample approval: Our SUS303 press bushings passed on first submission, no revisions required
• ⚡ Order placement: 8,000-piece batch order placed immediately after sample approval
• 📦 Production lead time: 14 days from order confirmation to shipment
• 🎯 Quality consistency: 100% pass rate on incoming inspection at client's facility — all bushings met ID/OD tolerance, concentricity, and edge quality requirements
• 🤝 Long-term partnership: Client has since placed 2 additional orders for other locating components (304 SS and 316L bushings)