Product Overview
For applications demanding the highest level of precision and surface quality, turned and polished pure iron bars are the superior choice. Unlike cold drawn bars, which may have slight die marks or residual stresses, our turned and polished bars undergo:
Precision CNC turning – achieves tight tolerances (h6, h5) and excellent roundness
Centerless or cylindrical polishing – produces a smooth, defect‑free surface (Ra ≤ 0.4 µm)
Stress‑relief annealing – restores soft magnetic properties after machining
The result is a ready‑to‑use bar that requires no additional grinding, honing, or polishing – saving you time and cost in your assembly line.
As the actual manufacturer, we control the entire process from electrolytic iron melting to turning, polishing, and inspection. You benefit from factory‑direct pricing, full traceability, and the ability to customize material grade (DT4, DT4C), diameter, length, chamfers, and even thread ends.
Key Features
| Feature | Benefit |
|---|---|
| CNC turned | Tight tolerance (h6/h7), excellent roundness, perfect concentricity |
| Polished surface | Mirror finish (Ra ≤ 0.4 µm), no scratches, no die marks |
| High purity (≥99.9%) | Low carbon (≤0.003%), low oxygen (≤0.005%) – stable magnetic performance |
| Excellent magnetic properties | High permeability (μ ≥ 10,000), low coercivity (Hc ≤ 48 A/m for DT4C) |
| Stress‑relief annealed | Removes machining stresses, restores soft magnetic behavior |
| Fully customizable | Diameter, length, chamfer, thread, groove, or cross‑hole |
| Factory direct | Competitive pricing, short lead times, direct technical support |
Applications
| Component | Why Turned & Polished Bar |
|---|---|
| Solenoid plungers / armatures | Mirror finish reduces friction; tight tolerance ensures smooth sliding |
| Precision shafts for magnetic sensors | High roundness and surface quality for reliable sensor operation |
| Hydraulic valve cores | Excellent sealing surface; corrosion‑resistant pure iron |
| Linear bearings / guide rods | Low friction, high hardness after optional case hardening |
| Electromagnetic actuator rods | Stable magnetic properties; no residual magnetism |
| Custom magnetic components | Threads, grooves, holes – fully finished per drawing |
Packaging & Delivery
Standard packaging: Individual protective sleeve, then foam‑lined cartons or wooden crates
Custom packaging: Anti‑rust paper + vacuum bag for long‑term storage
Lead time: 7‑10 days for standard diameters (5‑30 mm) without secondary features; 15‑20 days for custom
Shipping: Sea freight, air freight, or express courier
Frequently Asked Questions
Q: What is the difference between turned/polished and cold drawn pure iron bar?
A: Turned and polished bars offer higher precision (h6/h5 vs. h7/h8) , better surface finish (Ra ≤0.4 µm vs. ≤0.8 µm) , and no die marks. They are also more concentric and straighter. However, they cost slightly more due to additional machining. Choose turned/polished for sliding, sealing, or high speed applications.
Q: Do you provide stress relief annealing?
A: Yes. All our turned and polished bars are stress relief annealed after machining to restore soft magnetic properties. We can also supply as machined (unannealed) if you prefer to anneal in house.
Q: Can you add threads, grooves, or holes?
A: Absolutely. We are a full CNC machining workshop. Send us your drawing (PDF or DXF), and we will produce the finished component to your exact specifications.
Q: Can you achieve even better surface finish, e.g., Ra ≤0.2 µm?
A: Yes, for critical applications we offer super finishing (Ra ≤0.2 µm) upon request. Additional processing time and cost apply.
Contact Us
Request factory direct pricing for turned and polished pure iron bar – mirror finish, tight tolerance, and superior magnetic performance for solenoids, valves, sensors, and precision actuators.
Your trusted Chinese manufacturer of precision soft magnetic components.
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