Custom Magnetic Components
Toroidal and bobbin-wound coils on ferrite, silicon-iron, and permalloy cores. Wire gauges from 18 to 34 AWG. Turn counts from 200 to 1,500. Every unit tested. Every order RoHS compliant.
What We Build
From current sensing toroids to power filter chokes, we manufacture the magnetic components that keep your products running. Every part is wound, tested, and shipped to your exact specifications.
Ferrite and silicon-iron cores from 0.8" to 2.25" OD. 200 to 1,500 turns of copper or nickel magnet wire. DCR tolerance to ±5%.
View capabilities →
Precision bobbin winding with 18 to 34 AWG copper wire. Single and multi-layer configurations. SN100 lead-free solder termination.
View capabilities →
Current sensing transformers, power transformers, and isolation transformers. Tape-wound and ferrite cores. Designed for your application.
View capabilities →Technical Capabilities
We work with the core materials, wire types, and winding configurations that production applications demand. Here is what we bring to your project.
Wire Gauges
18, 26, 34 AWG
Core Materials
Ferrite, Silicon-Iron, 1J85
Core Sizes (OD)
0.8" to 2.25"
Turn Counts
200 to 1,500
DCR Tolerance
±5% to ±15%
Compliance
RoHS, Lead-Free
How We Work
Send us a drawing or specification. We review it, build samples, and deliver production quantities. One point of contact from start to finish.
Email your drawing, specification sheet, or a description of what you need. We review every detail and respond within 24 hours.
Response: 24 hoursOur team confirms we can meet every requirement: materials, tolerances, compliance. You receive a detailed quote with lead times and pricing.
Quote: 48 hoursWe build sample units to your exact spec. You test them in your application. We refine if needed. Production starts only after your sign-off.
Samples: 2 to 4 weeksEvery unit is wound, tested, and inspected before shipping. First orders typically deliver in 6 to 8 weeks. Repeat orders: 2 to 3 weeks.
Production: 1K to 100K unitsIndustries We Serve
Our inductors and transformers are in production today across these sectors. Each application has unique requirements for materials, tolerances, and compliance.
Filter chokes, power inductors, and transformers for AC/DC and DC/DC converters. Designed for efficiency and thermal performance.
High-permeability toroidal cores for current transformers and sensors. Precision winding for accurate measurement across industrial power monitoring systems.
Custom inductors for motor drives, PLCs, and automation equipment. Built to withstand demanding industrial environments.
RoHS compliant components for medical power supplies and diagnostic equipment. Strict quality control on every unit.
EMI filter inductors and signal transformers for telecom infrastructure. Consistent electrical performance across production runs.
Custom magnetic components built to military specifications. Documented processes and full traceability on every lot.
Currently in Production
NK Technologies manufactures current sensors for industrial power monitoring. Since April 2025, we have delivered over 150,000 cores across six product lines. Toroidal and bobbin-wound configurations, ferrite and silicon-iron cores, wire gauges from 18 to 34 AWG.
Zero rejected lots.
Units Delivered
150,000+
Product Lines
6 Active
Core Materials
Ferrite, Silicon-Iron, 1J85
Rejection Rate
0%
From the Blog
Guides, reference material, and industry insights for engineers and procurement teams working with custom magnetic components.
Two of the most common core materials in custom magnetic components. When to use each, and what the tradeoffs look like in real production applications.
Read article →
Why toroidal geometry is the preferred form factor for high-performance inductors, and how the shape affects electrical characteristics.
Read article →
A step-by-step look at the manufacturing process, from initial engineering review through final quality inspection and shipping.
Read article →Send us your drawings or specifications. We respond to every inquiry within 24 hours.