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Evolution of a Market Leader

Since 1919, the Triangle name has been synonymous with steel leaf springs. Originally located in the 'Golden Triangle' section of Pittsburgh, in 1927 Triangle's base of operations moved to DuBois, PA.

Early on, Triangle's market share increased through steady organic growth. However, a series of strategic acquisitions beginning in 1969 put Triangle firmly on the road to becoming North America's leader in undercarriage products for tractors, trucks, trailers and light duty vehicles.

  • 1969 - Acquired by The Marmon Group, Inc.
  • 1974 - Addition of Flagg Suspension Parts
  • 1982 - Opened Fontana, CA Distribution Center
  • 1988 - Opened Oklahoma City Distribution Center
  • 1991 - Addition of Triangle Air Spring Product Line
  • 2001 - ISO 9001:2000 Certification
  • 2002 - Became a member of Marmon Highway Technologies
  • 2006 - Opened the Short-run manufacturing plant in Punxsutawney, PA.

Triangle's strength lies in unparalleled manufacturing and distribution of product to its base of over 500 customers including aftermarket and niche OEM partners. Triangle products are known for quality and value through industry respected brand names such as Triangle Springs, Flagg Suspension Parts and Triangle Air Spring.

As a commitment to continued growth, Triangle utilizes the 80/20 philosophy to partner and build relationships with distributors that are leaders in the heavy duty suspension market. We constantly review market demand data to provide our distributors with dependable availability of strategic products throughout our distribution network.

The company was one of the first to offer leading edge electronic order entry options for customers in 1987. The TRI-NET Order Entry System and Spring & Suspension Technician software packages have become an industry standard. Since that time Triangle has continued to enhance its electronic commerce and cataloging capabilities with updates occurring on a regular basis.

The Triangle spring manufacturing facility has the flexibility to make thousands of different designs of leaf springs in as little as 24 hours. Our veteran workforce, Lean Manufacturing approach, and Continuous Improvement Kaizen teams contribute to the production of a quality product to the customer's engineering specification.

Broad product coverage, ISO registered facilities and an employee commitment to continuous improvement guarantees that Triangle Suspension Systems will remain a market leader for years to come.