Grayloc® Clamp Connectors

oceaneering, grayloc, connectors, product, clamp connector, metal to metal seal, advanced technology

Oceaneering® Grayloc® product lines use innovative pressure-containing technologies to meet your operational requirements.

Grayloc® Clamp Connectors

In use since the 1950s, our field proven Grayloc® clamp connectors are lighter, smaller, faster, and easier to maintain than conventional flanges. Stringent engineering processes and quality standards result in unparalleled and repeatable reliability.

Design Technology

  • Grayloc® metal-to-metal seal 
  • Self-energized and pressure-enhanced seal
  • Two-piece, four-bolt clamp design
  • Primary load-retaining member is the clamp, not the bolting
  • Significant space- and weight-saving design
  • Low makeup bolt torque
  • Visual indication of proper assembly
  • Reusable seal rings


  • Eliminates fugitive emissions with zero-leakage seal (10-6 atm cc/s helium)
  • Reduces installation time with only four bolts and 360° clamp rotation
  • Simplifies fabrication (no bolt holes to align)
  • Lowers maintenance costs
  • Minimizes spare parts inventory
  • Enables design of lightweight and compact piping systems, using integral fitting configurations
  • Grayloc hub profiles can be integrated into third-party (OEM) products

We offer a vast portfolio of products that deliver the solutions you need to complete operations. 

Contact Us | Grayloc® Clamp Connectors

Company page Since our founding in the early 1960s, Oceaneering has expanded and grown globally to service several industries such as the offshore energy industry, defense, entertainment, material handling, aerospace, science, and renewable energy industries. In 1964, Mike Hughes and Johnny Johnson formed a Gulf of Mexico diving company called World Wide Divers. The company grew in response to increasing demand for their services and in 1969 merged with two other diving companies to form Oceaneering International, Inc. To solve the toughest challenges, we do things differently, creatively, and smarter. As your trusted partner, our unmatched experience and truly innovative portfolio of technologies and solutions give us the flexibility to adapt and evolve, regardless of market conditions. Our mission is to solve the unsolvable. We thrive by creating industry-changing technically creative solutions for the most complex operational challenges under water, on land, and in space. Our five core values establish a common culture and demonstrate what is most important for us as a company. Since the beginning, the company has transformed from a small regional diving company into a global provider of engineered products and services. Today, we develop products and services for use throughout the lifecycle of an offshore oilfield, from drilling to decommissioning. We operate the world's premier fleet of work class ROVs. Additionally, we are a leader in offshore oilfield maintenance services, umbilicals, subsea hardware, and tooling. We also serve the aerospace, defense, and theme park industries. Underpinning everything we do, safety is not only the foundation of our core values, but it is vital to our unmatched performance record and company culture. The industries we serve are as diverse as they are complex. Whether we are engineering deepwater umbilicals or developing robotics for aerospace applications, the safety and health of our employees, vendors, and customers is an integral part of our day-to-day business. If we are working, then our responsibility is to be working safely. Since our inception in 1964, we have placed a high value on employee safety—from diving services and subsea inspection to vessel-based installation operations. We have and will continue to evolve not only our health, safety, and environmental (HSE) processes, but those of the industries in which we work. Although we have been fatality-free since 1999, our HSE journey goes beyond statistics. As our portfolio of services has grown, we have continued to prioritize and advance our approach to HSE.