Engineered to withstand extreme torque, high thermal stress, and strict dimensional tolerances.
Established in 2011 in Guangzhou, Guangdong Province, the heart of Southern China's advanced automotive manufacturing cluster, Guangzhou Mayumi Auto Co., Ltd. has evolved into a premier engineering and export hub. With a facility spanning over 25,000 square meters and staffed by a dedicated crew of more than 280 high-caliber engineers and technicians, our operation specializes in delivering high-precision aftermarket components, OEM manufacturing, and optimized global supply chain services.
We supply tier-one parts distributors, international remanufacturing networks, and specialty automotive builders worldwide. Our extensive catalogue stretches from precision drivetrain components, chassis assemblies, and steering gear joints to heavy-duty industrial brackets and electric vehicle powertrain integration kits.
Leveraging scale and state-of-the-art metallurgical technologies to support the critical supply demands of global partners.
Understanding the strict tolerances and architectural changes in contemporary transmission supply networks.
High-torque diesel and performance electric applications demand exceptional metallurgical purity. Guangzhou Mayumi utilizes chromium-molybdenum alloy steels with localized induction hardening to prevent micro-fatigue and shear failure in transmission shafts and planetary gear assemblies.
Modern 8-speed, 9-speed, and dual-clutch transmissions function with clearances as small as 5 microns. Precision grinding and micro-honing operations at our facilities ensure gear tooth profiles adhere strictly to DIN 3962 and AGMA Class 12 specifications, reducing friction loss and gear whine.
Procuring raw components from fragmented vendors introduces logistical failure points. Mayumi Auto serves as a vertically integrated single-point supplier—integrating metal fabrication, CNC finishing, and structural testing under one QC protocol to optimize pricing and reduce lead times.
Adapting standard mechanical setups to support high-efficiency hybrids, electric drivetrains, and smart steering configurations.
The global shift to electric vehicles (EV) calls for specialized high-speed reductions and optimized structural weight configurations. Mayumi Auto has expanded its production footprint to cover structural lightweight alloys, EV-grade structural carbon fiber body kits, and high-frequency PCBA system enclosures matching NACS (North American Charging Standard) specifications.
Our strategic development roadmap focuses on integration: engineering lightweight support systems, heat dissipation structural components, and high-durability steering knuckles designed to support heavier EV curb weights, such as those found on Model Y/3 platforms and modern BYD passenger fleets.
A breakdown of the metallurgical characteristics and testing parameters applied in our manufacturing process.
| Component Category | Common Base Material | Applied Hardening Process | Testing & Compliance Protocols | Target Applications |
|---|---|---|---|---|
| Transmission Shafts & Gears | 20CrMnTi / 8620H Alloy Steel | Gas Carburizing + Case Hardening (58-62 HRC) | Magnetic Particle Inspection (MPI) + Ultrasonic Flaw Detection | Heavy-duty commercial drivetrains, high-torque passenger platforms. |
| Power Steering Racks & Joints | 40Cr / 1045 Carbon Steel | Medium Frequency Induction Hardening (45-52 HRC) | Salt Spray Resistance Testing (Up to 720 Hours) | Passenger and light commercial vehicle steering linkages. |
| EV Structural Mounts & Stamping | Q355B / High-Strength Low-Alloy Steel | Stress Relieving Annealing + Cathodic Electrophoresis | Three-Dimensional Coordinate Measuring Machine (CMM) Verification | Chassis support platforms, EV battery enclosures, mounting bracket systems. |
| Lightweight Aerodynamic Panels | Carbon Fiber Composite / Premium ABS | Autoclave Curing / Injection Mold Heat Cycle Control | Structural Rigidity & High-Velocity Air-Tunnel Simulations | Performance aerodynamic modifications, replacement door trim sets. |
Navigating different trade areas requires deep knowledge of varying standards and customs regulations. Guangzhou Mayumi Auto secures swift clearances by adhering to international compliance frameworks.
We supply detailed documentation, including metallurgical testing reports, Certificate of Origin filings, and IATF-aligned dimensional checks. This ensures imported parts enter destination markets without custom holdups or quality disputes.
Answers to common questions regarding tolerances, logistics, metallurgy, and custom manufacturing.
We primarily utilize 20CrMnTi, 8620H, and 40Cr steel for gears, planetary carriers, and input shafts. These alloys are chosen for their excellent core toughness, hardenability, and structural stability under dynamic torsional loads. Upon request, we also process custom carbon steels for specialized heavy-duty transport and industrial applications.
Our precision machining workshops feature multi-axis gear hobbing equipment and CNC gear grinding setups. We hold structural tolerances down to <5 microns (μm) and verify profile errors, helix deviation, and runout using dedicated coordinate measuring machines (CMMs) to ensure low NVH (Noise, Vibration, and Harshness) profiles.
Standard component stock ships within 7 to 15 business days. For specialized OEM configurations requiring unique tooling, stamping adjustments, or heat-treating profiles, lead times typically range from 30 to 45 days. This allows for raw steel sourcing, precision casting, forging, heat treatment, final machining, and strict quality verification protocols.
Yes. All our production steps run in compliance with the IATF 16949:2016 quality framework. We support our shipments with material analysis certifications, coordinate inspection reports, and salt-spray test sheets. We also help global buyers meet local regulatory requirements, including EPA, REACH, and CE, depending on the product group.
Providing high-integrity components for classic powertrains, electric vehicles, and heavy-duty logistics fleets.
Mayumi Auto