About Us

Sigma Four is a ISO 9001:2015/AS9100D compliant company, based in Plano, Tx, since 1984. Our specialization includes contract manufacturing of custom cable assemblies and electrical harnesses, power supplies, medical products and services, value added and kitting services, development of prototype systems. We take pride in our focus on quality and our dedication to meeting our customers’ unique requirements. We will work with you to meet your requirements from drawings, prints, sample assemblies, schematics, verbal instructios. We are a local company who can help you meet your global needs. Our model allows us to work with local and global manufacturers.

We at Sigma Four strive to achieve excellence and on-time delivery in all our product offerings. Our goal is to:

Provide a cost effective solution to assembly needs, packaging services and import/export services, while adhering to highest customer standards.

SIGMA FOUR IS A MINORITY OWNED AND OPERATED BUSINESS

Approvals

  • UL
  • ISO Compliant
  • ITAR Registered
Minority Certifications

  • NCTRCA
  • DART
  • BART
  • CITY OF DALLAS
  • DFW AIRPORT
Industries Served

  • Telecommunication
  • Medical
  • Computer
  • Instrumentation
  • Cash Management
  • Commercial

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