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Fast. Clean. Precise. 



  • Precision Plastic Machining
  • Rapid Prototype Manufacturing
  • Material Selection Expertise
  • Application Development

Since 1969, Roncelli Plastics has specialized in Precision Fabrication, CNC Machining, Die Cutting, Rapid Prototyping, and Clean Room Assembly of plastic and non-metallic components.

Our highly experienced staff of machinists, quality personnel, and supervisors is dedicated to delivering the best quality plastic and non-metallic components in the industry. Roncelli Plastics has enjoyed success over the years as a result of its commitment to quality, integrity, and excellence for every customer.

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Monrovia, CA (HQ)

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San Jose, CA

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Dallas, TX

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AS9100D with ISO 9001:2015

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ISO 13485:2003