Overview
Soft magnetic pure iron rivets are specialized fasteners designed for applications requiring both mechanical joining and magnetic continuity. Unlike conventional fasteners that act as passive connectors, these rivets actively participate in the magnetic circuit-maintaining flux paths, minimizing reluctance, and preventing "weak spots" in electromagnetic assemblies.
With near-zero residual magnetism, they demagnetize almost instantly once the external field is removed, eliminating interference in sensitive circuits-a critical advantage over carbon steel or stainless steel alternatives. Available in custom diameters, lengths, and head styles, they are manufactured to DT4, DT4C, and ASTM A848 standards.
Key Features
Soft magnetic performance – near-zero remanence and ultra-low coercivity (<0.4 Oe) enable rapid magnetization/demagnetization cycles
High purity – ≥99.8% Fe with ultra-low carbon (≤0.02%) minimizes hysteresis losses
Magnetic circuit integration – becomes part of the flux path, not just a fastener
Cold forged construction – continuous grain flow enhances mechanical strength and magnetic homogeneity
Fully customizable – diameter, length, head style (round, flat, countersunk), and surface finish
Full traceability – Mill Test Certificate with every shipment
| Parameter | Value / Range |
|---|---|
| Purity (Fe) | ≥99.7% (typ. ≥99.8%) |
| Carbon (C) | ≤0.002% |
| Coercivity (Hc) | <0.4 Oe |
| Max Permeability (μm) | ≥12,000 |
| Saturation Flux (Bs) | 1.8–2.0 T |
| Diameter Range | custom on request |
| Length | custom on request |
| Head Types | Round, flat, countersunk, truss, custom |
Typical Applications
Relays and solenoids – magnetic cores and armatures where rapid switching is required
Electric motors and generators – core stack fastening and magnetic circuit bridges
Automotive sensors – ABS, fuel injection, EPS position detection systems
Medical devices – MRI components where zero magnetic signature is critical
Transformers – securing magnetic laminations without flux leakage
Electromagnetic actuators – precision assemblies requiring magnetic continuity
Frequently Asked Questions
Q: What does "soft magnetic" mean for a rivet?
A: It means the rivet magnetizes easily under a magnetic field and loses its magnetism almost instantly when the field is removed. Unlike hard magnets, it retains near-zero residual magnetism-preventing interference in sensitive circuits.
Q: Why choose pure iron rivets over standard steel fasteners?
A: Steel fasteners can distort magnetic fields and create "weak spots" in the flux path. Pure iron rivets maintain magnetic homogeneity, providing significantly better permeability with reduced hysteresis loss.
Q: Can I customize diameter, length, and head shape?
A: Yes-we produce to your drawings or specifications. Diameters from 1.5mm to 12mm, lengths from 4mm to 60mm, and any head style (round, flat, countersunk, or custom) are available.
Q: Do you offer plating or coating for corrosion protection?
A: Yes-zinc plating, phosphate coating, and rust-preventive oil are standard options. Specify your environmental requirements and we will match them.
Q: What is the minimum order quantity?
A: Flexible-from sample packs to full container loads. Contact us with your quantity for a quote.
Q: What is the typical lead time?
A: Standard sizes in stock ship within 3–5 days. Custom orders typically take 1–2 weeks depending on tooling and quantity.
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