June 2026: Sealevel’s 40th Birthday Month
What began in 1986 as a commitment to solving real-world engineering challenges has grown into four decades of reliable industrial I/O, rugged computing, and customer-focused innovation.
Reliability isn’t a feature, it’s our foundation. For 40 years, Sealevel solutions have delivered dependable performance in environments where failure isn’t an option. From rugged computing platforms to long-lifecycle industrial I/O, our systems are engineered to perform and endure.
Explore ProductsSealevel simplifies development by consolidating engineering, manufacturing, and support while designing platforms integrating computing and I/O. The result is reduced system complexity, fewer integration challenges, and a more efficient path from concept to deployment.
See Our SolutionsConnectivity at Sealevel is built on more than technology, it’s built on relationships. For decades, we’ve partnered with customers, engineers, and integrators to connect systems, operations, and people through dependable, purpose-built solutions.
Connect With UsSealevel at 40
From our earliest designs to today’s advanced platforms, every milestone reflects our commitment to reliability, innovation, and the people behind the products.
In 1984, Tom O’Hanlan designed the first RS-422/485 communication adapter for the IBM PC. From that moment of inspiration, Tom and his wife Susan saw an ever-growing industry-wide need and began work to fulfill it, forming Sealevel Systems, Inc. in 1986.
Sealevel earned early recognition for manufacturing excellence in South Carolina.
This milestone reflects Sealevel’s long-standing commitment to engineering innovation.
Sealevel products supported critical applications beyond Earth’s atmosphere.
Learn more about the NASA projectCertification reinforced Sealevel’s quality management standards and continuous improvement practices.
Sealevel expanded beyond I/O into rugged embedded computing for demanding environments.
Sealevel introduced RoHS-compliant PCI RS-232/422/485/530 boards and low-profile PCI digital I/O boards.
The expanded facility supported continued growth in engineering, manufacturing, and customer support.
Tour SealevelThe award recognized entrepreneurial leadership and contributions to manufacturing and technology.
Read about the awardInvestment in in-house SMT capabilities strengthened Sealevel’s manufacturing control and product quality.
Explore Sealevel ManufacturingSealevel continued its commitment to quality with certification to the updated ISO 9001:2015 standard.
The recognition honored decades of service and leadership in manufacturing.
Sealevel was recognized for operational excellence and transformation within South Carolina manufacturing.
AS9100D certification supports Sealevel’s continued growth in aerospace and defense-related markets.
Read more about AS9100D CertificationSealevel celebrates 40 years of reliability, innovation, and customer-focused engineering.
At Sealevel, the O’Hanlans made quality a priority from the start with an eye on the future. Ever since, that strategy has guided how the business approaches product and team development, customer support, and community relations.
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As Sealevel commemorates its past and future with a year-long 40th anniversary campaign, “Forty & Forward,” the company will honor the people, products, and partnerships that have defined its first four decades and support its future-ready vision as a trusted partner.
Read MoreBehind every Sealevel solution is a team of engineers, technicians, and support professionals dedicated to getting it right. Their expertise, collaboration, and commitment power our innovation and strengthen the communities and industries we serve.
For 40 years, Sealevel has supported engineers and organizations building systems that demand reliability and longevity. We look forward to partnering with you as you design, deploy, and scale what’s next.
We would like to introduce you to the best international partner for all of your Sealevel needs.
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