Presence on both sides
Companies in China and Germany. We work where our clients work — and in their language.
NaiSiTong GmbH
China Germany
Die Casting · Injection Moulding · Tooling
Quality you can trust, across borders.
We provide on-site sorting, rework, and complaint resolution across Germany and Europe — backed by deep industry experience from our team in China.
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Trusted by leading manufacturers
About — 公司简介
A specialist partner for manufacturing industry.
Naisitong is a dedicated service company for the manufacturing sector. Through our companies in China and Germany, we help die-casting, injection moulding, and tooling businesses worldwide, delivering professional, fast, and efficient on-site services to European customers.
We built our reputation in die casting — sorting is our core strength. We help suppliers reduce rework costs and resolve customer complaints with the technical depth the industry requires. That expertise is the foundation of everything we do.
01
2
Companies · CN / DE
02
10+
Years in die casting
03
24/48h
On-site response · EU
04
EN · DE · 中
On-site communication
Why Naisitong — 服务优势
We know die casting — and customer complaints. China and Germany — fast on-site mobilisation.
Deep die-casting expertise
Years of die casting and European market experience. We know die casting — and our clients.
Fast mobilisation
On site within 24–48 hours across Germany and neighbouring countries. Containment that stops problems before they spread.
Full-service coverage
From customer visits and technical support to sorting, rework, and expert advice — one client, one point of contact.
Services — 服务内容
Three service areas. One unified professional standard.
01 / 03 Commercial
Commercial services
Commercial negotiations, agency representation, and acquisition support — connecting buyers and suppliers across both markets.
02 / 03 Engineering
Technical services
Customer visits and project meetings on behalf of Chinese manufacturers — a capable technical liaison on the ground in Europe.
03 / 03 Quality
Quality services
Complaint handling, sorting, and rework. Expert solutions, on-site containment, and optimisation recommendations.
Sectors — 行业覆盖
Working across the European supply chain.
Our clients operate deeply in die casting, injection moulding, and tooling — as quality suppliers serving global markets and as professional buyers based in Europe.
- — 01 Automotive
- — 02 Rail
- — 03 Electrical appliances
- — 04 Two-wheelers
- — 05 Medical
- — 06 Industrial equipment
Insights — 行业洞察
Naisitong InsightsQuality notes from the industry frontline.
Practical writing on die-casting sorting, complaint handling, and the realities of bridging Chinese manufacturing with European industry.
European Tier-1 Demands Full Return Due to Packaging Damage? Real Case: Precise Tiered Disposition Saves Two Out of Three Pallets
Three pallets of fully dimensionally-inspected aluminum die-cast parts arrived in Europe with packaging damage. The Tier-1 customer demanded a full return. A NaiSiTong engineer arrived at the German warehouse within 24 hours, executed a precise tiered disposition — the heavily damaged and re-packaged pallet was proactively scrapped, the pallet with minor carton damage was validated through the customer's own lab sampling, and the lightly scuffed pallet was signed off on the spot — ultimately saving two pallets and preventing a production line stoppage and potential massive claims.
Read article
German Tier-1 Production Line Emergency: 3,500 Good Parts a Week, Maxed-Out Space and Tight Hours — How NaiSiTong Used Data to Win Works Council Overtime Approval and Close the Supply Gap in One Week
During the 2020 COVID pandemic, a top German Tier-1 customer's assembly line ran 24×7, consuming 500 parts daily. NaiSiTong engineers were on-site the same day — with warehouse space capped at 9 people, a works council hours agreement, and pandemic uncertainty, they used hard data to persuade the quality manager, who then secured works council overtime approval. The gap was closed in one week with safety stock to spare.
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When a German Tier-1 Flags Impact Damage on Your Die-Cast Parts — A Real Case Study: One On-Site Meeting, 90% Defect Rate Reduction
A die-casting supplier faced a near-10% defect rate for impact damage on aluminum housings, with the entire batch at risk of rejection. NaiSiTong engineers arrived at the German Tier-1 site the next day, mapped the assembly process, and convinced the customer to relax cosmetic standards on non-visible surfaces — cutting the defect rate by over 90%. A real complaint-handling case study.
Read article
Contact — 联系方式
Need on-site containment or a supplier assessment?
Describe your situation in a few sentences. We will respond within one business day with a clear scope of support — during German or Chinese business hours, whichever suits you.
CN China Company
NaiSiTong Co., Ltd
China, Hubei Province
Phone +86 135 8037 9618
DE Germany Company
NaiSiTong GmbH
Germany, North Rhine-Westphalia
Phone +49 152 0264 6584
- Joseph@NaiSiTong.com
- Contact
- Joseph Zhou