As the electric vehicle (EV) industry races ahead, every component in the drivetrain must meet rising expectations for performance, reliability, and sustainability. Among them, the e-motor shaft — the heart of the propulsion system — requires uncompromising machining precision. Behind every micron of improvement lies a world of fluid dynamics, engineering insight, and process stability.
1.Precision Fluids for a Demanding Industry
With targets like 93.5%+ motor efficiency and sub-75 dB noise thresholds by 2025, EV manufacturers are pushing the boundaries of powertrain engineering. These goals demand not only cutting-edge machinery but also equally capable metalworking fluid 
As a leading solution provider in sustainable industrial fluid systems, KERUN understands that every drop of fluid must perform — consistently, cleanly, and cost-effectively.
2.Tailored Fluids for Every Critical Stage
Machining an EV motor shaft is a precision-driven process — a coordinated “symphony” of operations, from initial face milling to the final spline finish. Each step demands exactly the right fluid — not just for function, but for excellence. At KERUN, we go beyond supplying fluids — we aim to be your trusted process partner.
Roughing & Post-Heat Precision Machining
Except for certain dry-cutting operations, we recommend long-life, high anti-rust performance metalworking fluids such as KR-C8520 and KR-C9020. These products are designed to provide extended tool life, surface integrity, and process stability under continuous operation.
Deep Hole Drilling of Hollow Shafts
For deep drilling operations where chip evacuation is critical, KR-C22L cutting oil offers outstanding flushing capability and thermal control, ensuring clean bores and tool protection.
Machining Copper & Copper Alloy Components
When processing machines involve copper or its alloys, corrosion can impact both quality and consistency. In such cases, we recommend custom anti-corrosion cutting fluids, such as KR-C9020-Cu, formulated specifically to protect copper while maintaining machining precision.
Spline Forming – Optimized for Every Method
No matter the forming method — hobbing, slotting, or emerging technologies like cold extrusion — KERUN offers quenching and forming oils tailored to each technique. Our fluids help ensure dimensional accuracy, smooth surface finishes, and trouble-free operations from start to finish.
3.End-to-End Protection, Stable Operation Without Compromise
Fluids alone aren’t enough — process stability relies equally on smart, professional equipment. KERUN integrates advanced support systems to ensure your metalworking fluids perform at their best throughout the entire lifecycle.
Our real-time oil condition monitoring system and the KR-COP600MT mobile centrifugal filtration unit act as reliable “health guardians” of your production line, continuously tracking and preserving fluid quality with precision.
Image | Sample Filtration Equipment
Image | Before & After Filtration Results
At the same time, our low-temperature evaporative waste treatment units and centralized chip handling systems not only enhance production efficiency, but also support your sustainability goals — ensuring every drop of resource is used to its fullest potential.
4.Co-Creating a Greener, Smarter Future
With over 20 years of dedication to the industrial fluid sector, KERUN has built its reputation on craftsmanship, innovation, and trust. Backed by multiple national-level certifications and a strong network of 3,000+ industry partners, we know that every breakthrough is made possible by your continued confidence and collaboration.
Looking ahead, KERUN remains committed to professional excellence and human-centric service — standing alongside you to overcome machining challenges and inject new momentum into the future of e-mobility manufacturing.
Event Preview: Industry Insights on E-Mobility Machining
From June 18 to 21, a major industry event focusing on EV motor shafts, gears, and bearings will be held in Taizhou, Zhejiang, co-hosted by LingAo Consulting and Juyue Gear.
We are honored to announce that Mr. Yuan Feng, senior expert from the Jiangsu Engineering Center for Metalworking Fluids and the Nanjing KERUN Technical Center, will deliver a keynote presentation on:
“Application and Selection of Fluids for EV Motor Shaft Machining”
Stay tuned for in-depth insights into fluid innovation and manufacturing excellence in the e-mobility sector!
