Grayloc® Universal Ball Joints

Add flexibility to piping spools in static and dynamic applications with our high integrity connectors.

Watch the video
Read the catalog

Grayloc Universal Ball Joints* provide secure, flexible connections between pipes and support the transfer of high temperature and high pressure process fluids across your operations. Our flexi-ball and uni-ball configurations ensure ease of maintenance while protecting the integrity of your piping systems.

*Formerly the SMX International Universal Ball Joint

Low Friction Movement Icon

Compensate for pipe misalignment and movement

Accomodate Thermal Expansion 1

Accommodate thermal expansion 

Suitable For Applications Icon 1

Reduce pipe stress

Grayloc® Universal Ball Joint photo callouts

Easy Integration and Superior Performance

Shipped factory hydrotested, pre-torqued, and ready for welding, our Universal Ball Joints incorporate a reliable high-temperature, high-pressure Graphoil® seal. Flexi-ball and uni-ball configurations are easily integrated to meet your diverse needs.

Slide to compare products

Technical Specifications

Nominal pipe size (NPS)1 to 24 in
Design pressure ratingSuitable for ANSI Class 150 up to 10,000 psig
Hydrostatic test pressure1.5 times design pressure rating rounded up to nearest 25 psig
Design temperature rangeUp to 1,000°F (556°C)

Body Nickel alloy, carbon, low-alloy, stainless, and duplex stainless steels
Ball Nickel alloy, carbon, low-alloy, stainless, and duplex stainless steels
Ball coating Contact Grayloc® Products
Packing Graphoil®
Injection port Type 316 stainless steel, 4140 low-alloy steel, or Inconel 718
External coatingPer customer specifications

ASME B31.1, Power Piping
ASME B31.3, Process Piping
ASTM F1298, Standard Specification for Flexible, Expansion-Type Ball Joints for Marine Applications
API 6FA, Specification for Fire Test for Valves
ISO 9001: 2008

Product Documents


Grayloc® Universal Ball Joints Catalog | Letter

Grayloc® Universal Ball Joints | A4
Play Video

Typical Applications

Product Variations

Balll Joint Variation 1 (1)

Expansion Arms

Custom-fabricated expansion arms suitable for thermal oil extraction applications.

Balll Joint Variation 2 (1)

Alignment Connectors

Flanged universal ball joints alleviate onsite alignment concerns.

Field Inspection and Maintenance Services

Grayloc offers on-site inspection and maintenance services to ensure the integrity of our connectors and to facilitate the return of worn or damaged ball joints to within factory specifications.

Contact us for more information

Contact Us

Contact Us | Grayloc® Universal Ball Joints

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.