At Erodex, we specialise in supplying premium die sinker EDM products and materials to manufacturers in the UK and worldwide. With over five decades of experience in spark erosion and electrical discharge machining (EDM), we offer the electrodes, fixtures, consumables, and technical expertise needed to produce highly accurate components with repeatable results.
Whether you’re machining injection moulds, precision cavities, or hardened tool steels, our die sinker EDM solutions are trusted by professionals in aerospace, medical, automotive, and tooling industries.
What is a Die Sinker?
A die sinker (or sinker EDM machine) is an EDM machine that uses shaped electrodes and electrical discharges to remove material from a conductive workpiece. Unlike wire EDM, which cuts through the material, a die sinker is used to create internal cavities, complex contours, and fine details—typically in hardened materials like tool steel, titanium, and carbide.
This process is highly accurate, contact-free, and ideal for applications where conventional machining methods are not viable.
Benefits of Using a Die Sinker EDM
- Machines hardened materials with ease
- No mechanical contact – no tool pressure or distortion
- Creates sharp internal corners and deep cavities
- Excellent surface finish – minimal post-processing required
- Highly repeatable – perfect for batch or high-volume production
- Ideal for complex tooling and precision moulds
Die Sinker EDM Products from Erodex
Graphite Electrodes
- Supplied as blanks or CNC-machined to spec
- Available in multiple grades for roughing and finishing
- Heat-resistant and cost-effective for complex electrode shapes
- Sole UK supplier of POCO graphite materials
Copper Electrodes
- Superior conductivity for fine finishing work
- Commonly used in medical and precision cavity applications
- Supplied in rod, plate, and custom-machined formats
Carbon Fibre Composite (CFC) Fixtures
- Lightweight and thermally stable
- Designed to hold workpieces or electrodes securely during EDM operations
- Custom-built for your machine and part geometry
Dielectric Fluids, Filters & EDM Consumables
- High-performance dielectric oils to improve spark control
- Replacement filters and deionising resin for optimal machine performance
- EDM machine accessories available from stock
Applications of Die Sinker EDM
Tool & Die
- Producing injection mould cavities, stamping dies, and tool inserts
- Sharp detail and exacting finishes required for forming operations
Aerospace & Defence
- Precision cavities in turbine components and exotic alloy parts
- Deep or blind holes in high-temperature materials
Medical Devices
- Surgical and orthopaedic tooling where precision is paramount
- Complex shapes in stainless steel, titanium and cobalt-chrome
Automotive Engineering
- Moulds and precision dies for injection systems and drivetrain parts
- Accurate machining of hardened steels for reliability under stress
Why Choose Erodex for Die Sinker EDM?
Erodex has been at the forefront of EDM and spark erosion supply in the UK for more than 50 years. We’re known for the depth of our technical knowledge, quality of our materials, and reliability of our service. Clients choose us because:
- We carry the UK’s largest stock of EDM materials including POCO graphite, HDHC, and EasyCut Copper
- We custom-machine electrodes and fixtures to client specifications
- We dispatch quickly across the UK and Middle East
- We understand the challenges of cavity EDM and offer real-world solutions
- We offer hands-on support and EDM expertise to optimise your process
From prototyping to full production runs, Erodex is the partner of choice for manufacturers demanding the highest level of EDM precision and repeatability.
Talk to Us About Your Die Sinker Needs
Whether you’re upgrading your EDM machines, sourcing new electrodes, or exploring fixture solutions, Erodex is here to support your die sinker projects with speed and confidence.