In the beginning we were quite skeptical about working with dowels in circumferential joints. However after the success in the Crossrail project, plastic dowels have become an alternative to the classic bolt system for our contractors.
Customer Tunnel Lead

Your connection to state-of-the-art tunnel projects.

Tunnel building is a highly specialized form of construction. Each tunnel project has unique requirements and considerations, ranging from workloads and fire ratings to safety and timelines.

For over 20 years, tunnel infrastructure teams around the world have come to trust Sofrasar Tunnels Products, an Optimas division, for their fastener solutions—from dowel, bolting and injection systems to anchors and accessories. Our global distribution network and supply chain expertise help to deliver the right solutions when and where you need them.

Reduce Risk

Our tunnel experts and engineers understand your specific needs. Whether you require standard components or customized solutions, we can support you with:

  • Engineering design support
  • Prototypes 
  • Responsive and efficient shipping
  • Quality control processes

In addition, our project-specific technical designs, available upon request, provide an added level of assurance in ensuring each solution is tailored to each application.

Our Capabilities

Purchasing Power, Distribution Strength

We deliver more than 10 billion parts annually, procured from an unrivaled global supply chain of selected supplier partners and managed in order to provide cost-effective, quality-driven and seamless delivery. What does it mean for you? We source the right product at the best price and assure that your project will stay on schedule and within your budget.

Global Standard, One Integrated Infrastructure

We work to meet all major global quality standards.  A single integrated infrastructure combines worldwide reach with regional service, providing the best of both to anywhere in the world you need us. Working in partnership with our customers, we can also set up facilities in geographies where we are not already on the ground in order to deliver you first class service. It is through such flexibility, efficiency and expertise that we have become such a valuable component of our customers’ success.

Bolting Systems
Centering Systems
Grout Lift Sockets
Guiding  Rods  And  Packers
Dowel Systems
Optimas Finite Elements Analysis
Optimas Precast Accessories
Validation  And  Testing  Protocol

The Components of Unrivaled Success.

To better serve you, we have tunnel solutions experts in Argentina, Hong Kong, India, Italy, Japan, Russia, Singapore, Spain, Portugal and United States.