Circle Polishing Inc

AOTCO Metal Finishing is New England’s trusted provider of specialty electroplating, electroless plating, anodizing, and other metal surface finishing services. Based in greater Boston and supporting customers throughout the country since 1975, AOTCO is proud of its reputation for reliable & outstanding quality, innovative problem solving and speedy turnarounds. Serving the Aerospace & Defense, Automotive, Electronics, Medical, Optical, Telecommunications, Clean Energy, and other advanced technology industries, AOTCO handles critical and complex jobs including multi-finish plating, complicated masking, parts with complex geometries, exotic substrates, and more. AOTCO is NADCAP accredited, ITAR registered, ISO certified - and follows a stringent quality control system that consistently delivers the highest quality standards & lead times. Through our research and development group, AOTCO LABS, AOTCO engineers work collaboratively with research-driven organizations to develop new processes and products, troubleshoot and resolve complex plating problems, and help scale finishing processes.

Founded in 1910, F.M. Callahan & Son Inc. is a full-service company and manufactures plating and coating engraving. Located in Malden, Mass., the company plates various metals of silver and gold, electroless nickel, sulfamate nickel, zinc, copper, tin and tin-leads. F.M. Callahan & Son Inc. offers a broad range of products for its customers, such as precious metal plating, zinc plating, copper, bright nickel plating, sulfamate nickel, pickling, sulfuric acid, color anodizing and many more. Its surface treatments include black oxide, pickling, passivating, iridating and chromating.