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Fast. Clean. Precise. 

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

Since 1969, we've been a California based thermoplastics and composites manufacturer specialized in Precision Fabrication, CNC Machining, Injection Molding, Die Cutting, Rapid Prototyping and Clean Room Assembly.

Our highly experienced staff of machinists, quality personnel, and supervisors are dedicated to deliver the best quality plastic components in the industry. We're an AS9100 certified company who have enjoyed success over the years as a result of our commitment to quality, integrity, and excellence for every customer from prototype through full production.

Roncelli Plastics Monrovia, California

Monrovia, CA (Headquarters & Manufacturing Campus)



Roncelli Plastics San Jose, CA Office

San Jose, CA


Roncelli Plastics Dallas, TX office

Dallas, TX

Roncelli Plastics Orlando, FL office

Orlando, FL

Boston, MA

Boston, MA

Roncelli Plastics AS9100d_ISO9001-2015 9Y931-AS12 Certificate

AS9100D with ISO 9001:2015

Roncelli Plastics ISO3485_2016 Certificate

ISO 13485:2016

Roncelli Plastics ISO27001-2013 Certificate

ISO 27001:2013