Bill Lang


Following his father’s footsteps, Bill Lang Jr. has been part of the Certified family for over 30 years. As President and CEO of the company, he has built upon the foundation left by Bill Lang Sr. to improve and expand the company to new heights. Regardless of how big Certified becomes, however, Bill wishes to maintain the same family-like dynamic that has led the company to prosper since its early beginnings.

Lonnie Barna

Sales Engineer

Lonnie has been in the fastener industry since the invention of the wheel, first as an expeditor and then a buyer. He then went on to sales and sales management. Having great interest in the products propelled him into problem solving and application engineering, which he then applied to Certified and has been an invaluable member ever since.

Bob O’Brien

Sales Executive

As one of our leading fastener experts, Bob has been with Certified Products for over 10 years and in the fastener industry for 37 years. In the past, Bob has been a certified internal ISO auditor, and takes an active role in the quality process at Certified Products. He is a board member of the Midwest Fastener Association where he has served as the President and is currently the Treasurer.

Patricia Johnson

Office Manager

Patricia has been with us for over 20 years, and has played one of the most fundamental roles ever since. Patricia handles much of the office responsibilities that would normally take a team to execute – specifically all of our accounting and finances. Much of Certified’s success can be credited to her hard work and guidance over the company’s operations.

Herbert Estacio

Purchasing Agent

Herbert is just making his way past the 5 year mark here at Certified. Before he moved to the office as a purchasing agent, Herbert earned his reputation while working as the warehouse manager. Among his accomplishments there include reorganizing the entire warehouse and its inventory, streamlining operations, and improving overall efficiency withing the workplace. A tech-wiz and incredibly quick learner, he has gone above and beyond his responsibilities to help the company succeed.

Sam Lang

Project Manager

Just graduated from Loyola University Chicago, Sam is the youngest of the Certified crew. Like his father and grandfather, Sam intends to one day lead Certified to further success. Though he has been working here since he was a child, he still has much to learn about the fastener industry. Sam looks forward to working among the rest of the Certified team along the way.

The Warehouse Team

Although they did not receive individual descriptions, there’s no question that every member of our warehouse crew is invaluable to Certified’s success. They always do their work and do it right, and they never fail to cause a laugh for the employees and customers. A huge thanks to every one of them for all of their hard work and dedication over the years!

From the Left: Ralph, Terrance, Marcelo, Paco, and Herbert

Our Team

Bill Lang

Lonnie Barna

Bob O'Brien

Sam Lang

Patricia Johnson

Herbert Estacio

About Us

Founded in 1986 Certified Products has been Chicagoland’s reliable source for fasteners and components for more than 30 years. In addition to our extensive product selection, we deliver:

  • Quality domestic & import products for virtually every requirement
  • Specials - made to your Specifications
  • Fully traceable products With in-house certification files
  • Liberal freight terms
  • Low $30 minimum Order - makes ordering easy
  • Fully stocked 10,000 Sq.Ft. warehouse facility
  • Same or next day shipping


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Call Us
Tel: 773.921.3300
Fax: 773.921.2971