1K107 Nanocrystalline Toroidal Core with Superior Permeability for Transformers

Oct 24, 2025

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A 1K107 toroidal core is a soft magnetic component made from a nanocrystalline alloy, known for its high permeability and low loss. It is used in applications like transformers and current transformers, particularly for high-precision metering, due to its excellent magnetic properties and efficiency at higher frequencies. The core is made by rapidly solidifying a molten metal, resulting in a ribbon-like material that is then wound into a toroid.

Nanocrystalline Toroidal Core Application

Current Transformers (CTs) for high-precision metering
High-frequency switch-mode power supply transformers
Common Mode Chokes
Inverter reactors and PFC (Power Factor Correction) inductor cores

Durability: The raw material is fragile, so the completed core is protected by a coating, such as epoxy resin or a crepe paper wrapping, to shield it from mechanical stress.

Customization: Available in various sizes and with options for different coatings.

What is the material of nanocrystalline core?

Nano crystalline soft magnetic material is a new development. The material composition is 82% iron with the remaining balance silicon, boron, niobium, copper, carbon, molybdenum, and nickel. Nano crystalline cores for common mode choke. The raw material is manufactured and supplied in an amorphous state.

What is the saturation of a nanocrystalline core?

Saturation induction of 1.25T and a wide temperature range mean that common mode chokes, current transformers, and magnetic amplifiers (mag amps) made with nanocrystalline cores are less vulnerable to current imbalance and loss of performance at high temperature.

What is the difference between amorphous and nanocrystalline cores?

By the end of the production process, the amorphous cores remain with a metallic-glass structure, while the nanocrystalline cores obtain a refined structure of nanometric magnetic grains scattered in an amorphous metallic matrix.

What is the frequency range of a nanocrystalline core?

These properties make Nanocrystalline highly suitable for power transformers at frequencies ranging from 10 to 100kHz and common-mode chokes from 10kHz to 100 MHz.

Nanocrystalline ring Core specification

1K107 Nanocrystalline Toroidal Core with Superior Permeability for Transformers

Magnetic core size(mm)			Protective box size(mm)			Effective cross-sectional area Ae(mm2)	Magnetic path length Ie(mm)	Maximum DC overcurrent class (A)
id	od	ht	ID	OD	HT	Effective cross-sectional area Ae(mm2)	Magnetic path length Ie(mm)	Maximum DC overcurrent class (A)
14	19	6.5	12	22	8	11.86	51.81	20
14	20	10	12	22.3	11.4	29.68	52.29	40
16	21	10	15	24	12.3	24.85	57.41	60
16	23	8	15	24	9.7	20.44	61.23	60
16	23	10	15	24	12.3	34.62	59.92	60
17	22	10	15.3	24.4	12.3	24.86	60.59	60
17	21	8	15.3	24	9.7	25.56	60.67	60
17	23	8	15.3	24.4	9.7	26.89	61.34	60
18	23	10	16.4	24.4	12.3	29.78	60.38	70
18	24	9	16.4	25	11.2	34.78	60.89	70
18	25	10	16.4	25.9	12.3	37.97	64.56	70
19	24	9	17.3	25	11.2	40.39	65.32	80
19	25	10	17.3	26	12.3	39.42	62.31	80
19	26	10	17.3	27.3	12.3	48.32	69.56	80
20	25	10	18.5	26.3	12.3	39.29	70.32	90
20	28	10	18.5	29	12.3	45.76	73.88	90
20	32	10	18.5	32.3	12.3	58.91	78.75	90
21	29	10	18.2	31.3	12.3	39.65	77.19	100
21	26	8	18.3	27.4	9.7	46.54	78.32	100
21	28	10	18.3	30	12.3	50.39	77.45	100
22	28	10	20.5	30	12.3	49.32	79.89	120
22	32	10	20.5	33.4	12.3	43.58	73.43	120
23	32	10	21.3	33.4	12.3	44.56	74.56	120

GNEE Featured Products

Gnee provides premium iron cores to the world. Our cores can be selected in a wide range of materials, shapes, applications, manufacturing techniques, etc., to meet customers' diverse demands. Explore our wide product range now~

Manufacturing Process

1. Raw Material Sourcing

2. Slitting

3. Punching

4. Laminating

5. Core Forming

6. testing

GNEE EC

Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
The company currently occupies over 20,000 square meters and employs more than 200 people, including over 80 professionals. After more than 18 years of development, we have built our own magnetic material production base and independently develope, produce, and sell various kinds of iron cores. The common types include silicon steel cores, motor cores, transformer cores, toroidal iron cores, special-shaped cores, custom cores, and others. Our cores are widely applied in different sectors including transformers, motors, mutual inductors, voltage stabilizers, welding machines, magnetic amplifiers, and instrumentation, providing diverse core solutions to global customers.

GNEE EC

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Why Choose GNEE EC?

GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.

18+

Over 18 years of success in the iron core industry;
National High-tech Enterprise & Famous Brand Enterprises in China;

200+

Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;

35+

Annual turnover up to 35 million dollor per year;
Owns many sets of highly automatic winding, annealing, and assembling machines;

1,000+

Over 1000 customers in domestic and overseas markets;
core Products are exported to more than 70 countries in the world;

Gnee Iron Core Factory Overview

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Industries Served

Automobile Industry

New Energy

Motor Applications

Transformer Applications

Our Mission

Strive To Create world-class Iron core brand

With 18 Years of industry experience, we focus on the research, development, and manufacturing of high-quality iron cores for electricity, industrial control, new energy, and automotive markets

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