High-Purity Graphite Rod and Round Bar for EDM and Furnace
Product Overview
Our high-purity graphite rods and round bars are extruded and isostatic-molded graphite stock available in a wide range of diameters and lengths for EDM electrodes, furnace applications, heating elements, and general engineering use. Each rod is precision turned to diameter and cut to length, providing ready-to-use graphite bar stock for mold makers, furnace builders, and research laboratories. We supply both extruded graphite rods (economical, general-purpose) and isostatic graphite rods (fine-grain, high-strength) to match your application requirements and budget.
Graphite round bar is one of the most versatile graphite forms, used as EDM electrode stock, furnace support posts, thermocouple protection tubes, heating element cores, and jigs and fixtures. At Jincheng Graphite, we stock diameters from 5 mm to 200 mm in standard lengths up to 1000 mm, and can custom-cut, drill, turn, and machine rods to your exact drawing. Our rods are manufactured from consistent-grade graphite with certified density, hardness, and electrical resistivity.
Key Features
- Wide diameter range - from 5 mm micro rods to 200 mm heavy-duty bars
- Precision turned surface - smooth, round bars ready for immediate use
- Two material options - extruded (economical) and isostatic (fine-grain, high-strength)
- Consistent material properties - certified density, hardness, and resistivity per batch
- Cut to length - standard 300 mm, 500 mm, 1000 mm or custom lengths
- Excellent machinability - drills, turns, and mills easily with standard carbide tooling
- High temperature resistance - suitable for vacuum and inert atmosphere furnace use
- Custom machining available - threaded ends, cross-drilled holes, and precision turned features
Technical Specifications
| Parameter | Value |
|---|---|
| Material Types | Extruded graphite, Isostatic graphite |
| Diameter Range | 5 mm - 200 mm |
| Standard Length | 300 mm, 500 mm, 1000 mm |
| Bulk Density (extruded) | 1.65 - 1.75 g/cm³ |
| Bulk Density (isostatic) | 1.78 - 1.88 g/cm³ |
| Shore Hardness | 50 - 70 HS |
| Flexural Strength | 30 - 65 MPa (grade-dependent) |
| Electrical Resistivity | 10 - 20 µΩ·m |
| Diameter Tolerance | ±0.1 mm (turned), ±0.5 mm (as extruded) |
| Straightness | < 0.2 mm per 300 mm |
| Surface Finish (turned) | Ra 1.6 - 3.2 µm |
| Max Temperature | 3000°C (vacuum/inert) |
Applications
- EDM electrodes - round and shaped EDM electrodes for mold sinking
- Furnace supports and posts - support rods and jigs in vacuum and atmosphere furnaces
- Heating elements - rod heaters and support elements for high-temperature furnaces
- Thermocouple protection tubes - graphite tubes for high-temperature thermocouples
- Glass industry - graphite plungers and mandrels for glass tubing and vial forming
- Laboratory and R&D - graphite stirring rods, electrodes, and fixtures for research
Why Choose Jincheng Graphite?
- Large stock program - standard diameters in stock for immediate shipment
- Two material grades - choose economical extruded or precision isostatic to match your application
- Cut-to-length service - we cut rods to your exact required length
- Custom machining - turning, drilling, threading, and slotting per drawings
- Competitive pricing - factory-direct graphite bar stock
- Quality certified - material test reports available on request
- Fast shipping - stock rods ship within 3-5 business days
- Export worldwide - serving EDM shops and furnace builders in 20+ countries
FAQ
Q: What is the difference between extruded and isostatic graphite rods?
A: Extruded graphite rods are more economical and suitable for general-purpose applications, with directional grain structure. Isostatic rods have uniform properties in all directions, finer grain size, and higher strength, making them preferred for EDM precision work and high-stress furnace applications.
Q: Can you machine threads or holes in the graphite rods?
A: Yes. We can machine threaded ends, cross-drilled holes, slots, chamfers, and other features per your drawing. Send us a sketch or CAD file and we will quote the complete machined rod.
Q: What is your minimum order for graphite rods?
A: We accept single-piece orders for standard stock diameters. Custom machined rods have a small minimum order, typically 5-10 pieces, to cover setup time.
Q: Do you supply larger diameter graphite cylinders?
A: Yes. We can supply larger graphite cylinders and tubes up to 500 mm outer diameter by machining from isostatic graphite blocks. Contact us with your dimensions for a quote.
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