Arnold manufactures a wide range of both permanent and soft magnetic products and assemblies at 11 facilities in the United States , the United Kingdom and China . Arnold has over 4,000 customers in ten Market Segments . International sales represent about 33% of the total.

The Arnold Engineering Company and associated companies, is the Magnetic Products Group of of SPS Technologies and has headquarters in Marengo, Illinois , USA , about 75 miles northwest of Chicago .