Manufacturers of quality stripwound toroidal cores

Airlink transformers toroidal cores are manufactured in a range of sizes which are kept in stock for immediate delivery.
In addition to our standard core sizes we would be please to quote for your special requirements.

• Material: Unisil M089-27N (27M4)
• Maximum loss 0.89w/kg @ 1.5T.50Hz
• Widths 10 - 100mm
• All material supplied to BS EN 10107:2005
• Toroidal cores available from stock
• Maximum OD 230mm Maximum ID 150mm
• All prices quoted are ex-VAT
• Airlink has been manufacturing toroidal cores since 1992 on high speed fully automatic core winding machines.
• View Fitting Instructions

The listed strip widths cater for all cores in the standard range.
Toroidal cores can be supplied in strip widths outside the listed sizes but a surcharge may be applicable.

Grain Oriented Silicon Steel (GOSS/CRGO
The cold rolled grain oriented steel used in the production of Airlink Transformers toroidal cores consists of 3% silicon-iron alloy. Manufactured with a grain orientation facilitates very low power loss ideal for high efficiency transformers.
1.Up to 30% more flux for the same magnetising force
2.Increased rating for a given size of transformer.
3.Better regulation.
4.Reduction in size and weight
5.Reduced assembly time, storage and handling costs.

Limits of Tolerance
Inside diameter +-0.8mm
Outside diameter +-0.8mm up to 150mm +-1.2mm up to 230mm
Height -0+0.8mm for cores up to 60mm. -0+1.2mm for cores over 65mm

Calculation of toroidal core weight
Nominal finish weight of toroidal core = 3.182/4x7.65x0.95x0.000001xHtx(Od+id)xOd-id)

Od = Outside diameter
id = Inside diameter
Ht = Strip width

Performance Guarantee
Non-Impregnated toroidal cores are normally offered with the following standard guarantee
0.3mm Grade M4 50Hz 1.0 Tesla limit: 19.0 A/M

Magnetic Degradation
Occurs when toroidal cores are impregnated with varnish or epoxy coated.
Light impregnated varnish +15%
Epoxy coated +40%


Company Profile
Airlink Cores in Harlow Essex, Has over twenty five years experience in the development and manufacture of toroidal cores. Modern production techniques have enabled us to produce a high quality product at very competitive prices. Exporting all over the world.
Peter Harris, the managing director has been involved in the industry since 1980 and has built a strong team at Airlink to serve the varying and individual requirements of customers. Through close discussions with customers Airlink has established a Kan Ban stock system. This enables us to reduce lead times and customers own stock levels; this service is available to all their customers who feel they would benefit from it
Employees are well trained, committed and equipped to maintain the closest technical liaison with customers. The result is that the products of Airlink Cores meet the toughest of customer specifications. Committed to innovation. Airlink recently spent £250,000 to upgrade its fully automated toroidal core line and Annealing furnace in order to gain greater productivity and to enhance product quality.
We only use the latest high permeability grain oriented electrical steel provide by Orb Electrical Steel in South Wales.
We occupy 7000sq ft of modern factory space and employ a workforce of over twenty-five.
Transformer core manufacturers
Leading manufacturer of magnetic cores
Magnetic cores
Toroidal cores
Manufacturer of strip wound cores

Quality Assurance
Our quality assurance system monitors each stage of the manufacturing process to ensure that the customers and standards are met.
All core meet IEC404, EN10107/EN10106 and BS6404 standards.
Selection of magnetic steel by electrical and mechanical qualities to ensure suitability for the particular strip wound core to be used
2.Electrical test and checks for the correct dimensions following the heat treatment cycle to ensure that the cores have been wound correctly and that the heat treatment conditions have been satisfactory.
3.It is normal practice to inspect cores on a 100% basis after final processing.This ensures that the dimensions are correct and the electrical specifications limits have been adhered to.
4.The inspection department organisation monitors the despatch packing methods to ensure that the product arrives at the user in good condition.