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.

Sam Lang

Vice President

Graduated from Loyola University Chicago with a bachelor’s degree in Business Administration and Operations Management, Sam is putting to use what he learned to help Certified grow and improve. Though he has been working for the company since he was a child, he still has much to learn about the fastener industry and looks forward to working with the rest of the Certified team along the way.

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 CFIS for over 15 years and in the fastener industry for over 40 years. In the past, Bob has been a certified internal ISO auditor, and takes an active role in the quality process at CFIS. He was also a board member of the Midwest Fastener Association where he has served both as the President and the Treasurer.

Patricia Johnson

AP/AR Manager

Patricia has been with us for over 25 years and has played a fundamental role in Certified’s success. Patricia handles many of the office responsibilities – such as our accounting and finances – that keep Certified running. Just pay those bills on time so she won’t come running after you next!

Monica Wiatr

Purchasing Agent

Having worked in many different administrative positions over the years, Monica brings a wealth of knowledge and experience to her latest role as Purchasing Agent for CFIS. Monica has always been a smart shopper in her personal life and she now uses those skills to hunt for great deals at work too! Monica is also Sam Lang’s mother, which helps solidify our proud status as a family-owned and operated company.

Our Team

Bill Lang

Sam Lang

Lonnie Barna

Bob O'Brien

Patricia Johnson

Monica Wiatr

About Us

Founded in 1986 Certified Fasteners 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 20,000 Sq.Ft. warehouse facility
  • Same or next day shipping


Free Freight Shipping Rates - Click Here

Call Us
Tel: 773.921.3300
Fax: 773.921.2971