If you’re sourcing charging pins for EV charging guns, you’ve probably noticed that not every CNC shop can deliver the precision these components require. Charging pins — the small metal contacts inside CCS, NACS, and Type 2 charging connectors — demand tight tolerances, burr-free surfaces, and consistent quality across production batches. Get the pin geometry wrong, and the charging gun won’t make reliable contact. Get the surface finish wrong, and you’ll see premature wear or increased contact resistance.
This article covers what to look for when evaluating a charging pin manufacturer, why Swiss-type turning is the right process for these parts, and how to qualify a supplier that can meet your volume and quality requirements.
Charging pins for EV applications carry higher currents (16A to 500A+ depending on the standard) and must maintain consistent contact over thousands of insertion cycles. Unlike signal pins in standard connectors, charging pins:
These requirements rule out standard CNC turning. You need Swiss-type CNC lathes, which support the precision and surface finish that charging pins demand.
Standard CNC lathes hold the workpiece in a chuck and rotate it against a stationary cutting tool. For small-diameter parts like charging pins (typically Ø3mm–Ø12mm), the workpiece can deflect under cutting pressure, causing dimensional variation.
Swiss-type lathes solve this by supporting the bar stock close to the cutting point with a guide bushing. This means:
For charging pin production, Swiss turning isn’t a luxury — it’s the right tool for the job.
When you’re sourcing charging pins for a new charging gun project, here’s what to check during supplier qualification:
Does the shop run Swiss-type CNC lathes? How many axes? Can they handle the diameter range you need? A shop running only standard CNC lathes will struggle with charging pin tolerances.
Charging pins require dimensional inspection beyond basic go/no-go gauging. Look for suppliers with CMM (coordinate measuring machine) capability and full inspection reports. Ask about their sampling plan — is it AQL-based or 100% inspection on critical dimensions? For answers to more common sourcing questions, check our EV charging pin sourcing FAQ.
EV charging components need full material certification. A reliable supplier should provide mill certificates for each batch and maintain traceability from raw material to finished part.
Typical lead times for custom charging pins from a Chinese supplier range from 3 to 6 weeks. Ask about rush options for prototyping and how they handle engineering changes mid-production.
If you’re shipping to the US or Europe, your supplier should be comfortable with DDP (delivered duty paid) terms, understand RoHS/REACH compliance, and have experience packing precision parts for international freight.
We run Swiss-type CNC lathes exclusively — no standard CNC, no compromises. Our workshop is set up for small-diameter precision parts, which means charging pins are exactly what we do best.
Here’s what we deliver to charging gun and connector manufacturers:
We supply charging pins for CCS, NACS, and Type 2 connectors. If you’re developing a charging gun and need a reliable pin supplier, we’d be glad to review your drawing and quote the job.
Contact us to discuss your charging pin requirements.
What should I look for in a charging pin supplier?
Swiss-type CNC lathes, CMM inspection, material traceability, plating experience, and DDP shipping capability.
Why is Swiss turning better for charging pins?
Swiss lathes use a guide bushing to support the bar stock, eliminating deflection. Better concentricity and surface finish than standard CNC.
What tolerances can I expect?
A qualified shop should hold ±0.01mm on critical diameters. Typical drawing tolerances range from ±0.02mm to ±0.05mm.
How long for custom pins from China?
Prototypes: 5-7 working days. Production: 3-4 weeks. DDP air freight: 5-7 days. Total: 2-3 weeks.
Have more questions? Check our complete FAQ page for quick answers about VOLCRIX capabilities, materials, tolerances, and shipping.
