Electroless nickel for hybrid connectors
Electroless nickel (EN) at SM Finishes deposits without external current, so thickness follows the surface — including recesses electrolytic nickel under-plates. When specified, we process to ASTM B733 / MIL-C-26074. AS9100:2015 and ISO 9001:2015 from Machohalli, Bengaluru.
Phosphorus content, heat treatment and thickness should be on the drawing. We treat EN as a specified engineering coating with travellers suitable for Japanese and Taiwanese SQA review, not as a generic “chemical nickel”. Lead time depends on heat-treat requirements and geometry, quoted after the RFQ.
Why Our Electroless Nickel Plating Stands Out
Our process combines controlled bath chemistry, precise temperature regulation, and skilled process management to produce coatings with predictable hardness, excellent adhesion, and exceptional corrosion resistance.
- Over complex shapes
- High wear resistance
- Superior corrosion
- Enhanced lubricity
- Excellent adhesion
- Internal surfacese
In addition to superior corrosion and wear resistance, our electroless nickel plating process offers outstanding dimensional control, making it ideal for tight-tolerance engineering applications. The ability to deposit coatings with controlled phosphorus content allows us to tailor properties such as hardness, ductility, and magnetic response to meet specific performance requirements.
Precision & Craftsmanship
Every electroless nickel-coated part is produced under tightly monitored conditions, ensuring consistent results and a flawless finish, regardless of shape or size.
Applications
Electroless nickel plating is extensively used in aerospace, oil and gas, electronics, automotive, and precision engineering industries, offering both protective and functional benefits for critical components.
Electroless nickel process
EN is autocatalytic. That is why aerospace fittings, connector shells and complex hybrid-connector hardware specify it: throw into holes and uniform build on internal geometry. We control bath chemistry (atomic absorption is in the lab) and thickness (Fischer XRF). Heat treatment, when specified, is part of the process flow — not an optional extra we skip.
High-phosphorus vs mid-phosphorus is a drawing callout. Do not assume “EN” means one alloy. Send the spec with the first RFQ.
Applications in aerospace, defence and connector hardware
Shells, couplings, complex brackets and wear surfaces around hybrid connectors. Contacts themselves more often use electrolytic nickel under gold; EN is for the geometry electrolytic current cannot cover evenly. Mixed BOMs that use both are common — see our comparison article on electroless vs electrolytic nickel.
RoHS: as we process EN for connectors, confirm any customer-restricted list on the drawing. Our XRF lab includes RoHS / WEEE / ELV heads. Export lots to Japan and Taiwan should state phosphorus class and heat-treat on the print.
EN vs electrolytic nickel, and racking
EN is not barrel-tumbled in the same way as electrolytic barrel nickel; parts are fixtured for uniform solution flow. Electrolytic nickel remains the usual undercoat on open contacts. Choose EN for throw; choose electrolytic for a bright decorative or simple undercoat on open geometry.
Related: nickel plating, chemical conversion on aluminium housings, passivation on stainless, gold on contacts. PPAP available for automotive programmes.
Questions? You’re covered
We’ve gathered answers to the most common questions to help you understand our services, processes, and quality standards with ease.
