Custom CNC Tapping & Grinding Services: Precision Threading + Precision Finishing for OEMs

📑 Contents

• 1. CNC Tapping – Our core threading service
• 2. CNC Grinding – Precision finishing
• 3. Tapping vs Grinding – How they work together
• 4. Why choose us? (LEGEND commitment)
• 5. Real-world industrial cases
• 6. Frequently asked questions
• 7. Get your free quote today

🔄 CNC Tapping: High‑precision internal & external threads

CNC tapping is the most efficient and accurate process for creating consistent, high‑quality threads on custom parts. We operate 25 high‑performance CNC tapping machines including automatic, vertical, and horizontal models. Capabilities: thread sizes from M1 to M50, thread tolerances down to 6H/6g (ISO standard). Materials: aluminum, stainless steel (303, 304, 316L), carbon steel, brass, copper, titanium, PEEK, nylon, ABS, and more.

For buyers with transactional intent: prototypes in 2-4 days, bulk orders in 7-15 days, rush options available. Our tapping process is optimized to reduce thread defects and material waste, directly lowering your unit cost — especially for volumes above 5,000 pcs.

⚙️ CNC Grinding: Superior surface finish & dimensional accuracy

We complement tapping with CNC grinding — the ideal secondary process for refining part surfaces, improving dimensional accuracy, and achieving smooth finishes. We operate 18 CNC grinding machines (surface, cylindrical, and centerless grinders) supporting part sizes from 0.3 mm up to 1800x1000 mm with dimensional tolerances as tight as ±0.002 mm and surface finishes down to Ra 0.2. All grinding is done in‑house alongside tapping to ensure perfect alignment between threaded and ground features.

Secondary operations available: polishing, deburring, anodizing, plating – all from a single source.

📊 Tapping vs Grinding – How they complement each other

💡 Integrated workflow: By handling both tapping and grinding in‑house, we eliminate coordination between suppliers and reduce lead time by up to 25% while ensuring feature alignment.

🏆 Why choose us? 

We have processed 90,000+ custom tapped and ground parts for clients in 32+ countries. Our team includes 14 certified machinists, 3 senior process engineers, and a dedicated QC team. We hold ISO 9001:2015 and comply with IATF 16949 (automotive), AS9100 (aerospace), and ISO 13485 (medical) — full traceability from material to finished part. Our QC lab is equipped with CMM, thread gauges, surface roughness testers, and hardness testers.

📌 Real‑world case studies

🔹 Aerospace threaded housings (Tapping focus)

Client required 5,000 titanium housings with 6H thread tolerance, 10‑day lead time. We optimized tapping program, implemented in‑process thread inspection, and delivered 1 day early with 0% defect rate. The client expanded their tapping orders within the same quarter.

🔹 Automotive transmission components (Tapping + Grinding)

An automotive OEM needed both threaded holes (tapping) and smooth outer surfaces (grinding) for transmission parts. By handling both processes in‑house, we reduced their lead time by 25% and eliminated misalignment risks — saving them over $15k in separate supplier management.

❓ Frequently Asked Questions (CNC Tapping & Grinding)