A Tradition of Quality Backed by Personalized Service
For over fifteen years, JIAYI has manufactured precision carbide cutting tools for global hydraulic OEMs and precision component manufacturers — delivering factory-direct engineering, transparent pricing and uncompromising tolerance control.
Founded in 2009. Engineered for OEMs.
JIAYI was founded in 2009 in Shenzhen with a single mandate: to manufacture precision cutting tools that meet the tolerance demands of global hydraulic OEM manufacturers — without the markups and lead times of traditional distribution.
Today, our 1,800 m² production facility houses Walter (Germany) and Rollomatic (Switzerland) 5-axis CNC grinding systems, producing over 8,000 tools per day. Our team of more than 120 technicians and engineers serves customers across 15 countries, from cartridge valve manufacturers in Europe to aerospace tier-1 suppliers in North America.
We specialize in cavity tools and port tools compatible with Sun Hydraulics, HydraForce, Parker Hannifin, Danfoss, Bosch Rexroth and Eaton Vickers standards — alongside a complete program of hole-making, threading, milling and gear cutting tools in carbide, PCD, PCBN and cermet substrates.
The JIAYI Commitment
Four principles that shape every tool we ship, from the first drawing review to the inspection report in the box.
Vertical integration
From substrate selection and CNC grinding to in-house PVD/CVD coating, laser marking and final metrology, every step happens under one roof in Shenzhen. This eliminates the hand-offs that introduce variation and lets us guarantee runout under 0.005 mm and concentricity under 0.003 mm on standard catalog tools.
Engineering as a service
Our application team — many of whom spent years on the shop floor before joining JIAYI — works directly with OEM tooling engineers to optimize geometry, flute count, helix angle and coating for each customer's material, machine and cycle target. Roughly 40% of what we ship is custom or semi-custom, designed against a customer drawing or an improved reverse-engineered sample.
Quality verified, not assumed
Every batch is checked on Zoller Genius 3 optical measurement systems and Mitutoyo CMMs, and every shipment leaves with a full inspection report traceable to the operator, machine and grinding wheel used. We are ISO 9001:2015 certified and audited annually by several of our tier-1 aerospace and medical customers.
Long-term partnership
Beyond the product, we invest in the partnership: 24-hour quote turnaround, dedicated account engineers, stocking programs for high-volume SKUs, and DDP shipping to most destinations in Europe, North America and Southeast Asia.
Best-in-Class Grinding Technology
German and Swiss grinding and measurement systems for repeatable geometry on every tool.
Helitronic Vision 400L
5-axis tool grinders
GrindSmart 830XW
Grinding for micro tools
Genius 3
Measurement and inspection
CMM
Full dimensional verification per piece
From Blank to Finished Tool
Grinding, sharpening and finishing processes carried out in-house at our Shenzhen facility.
From Carbide to PCD
- PCDPolycrystalline diamond for composites and non-ferrous materials
- PCBNPolycrystalline cubic boron nitride for hardened steel
- CermetTitanium-based substrates for high-speed finishing
- CarbideK10–K40 grades for all hydraulic applications
What We Stand For
- OriginalityIn-house engineering on every custom tool we manufacture.
- IntegrityTransparent tolerance reports and honest lead times.
- Service Excellence24-hour quote response and dedicated account engineers.
- Professional EthicsLong-term partnerships, not transactional supply.
See Our Factory for Yourself
Book a factory tour in Shenzhen or send your drawing for an engineering review. Every order ships with full inspection documentation.