Founded by aerospace engineer and inventor Charles H. “Chuck” Popenoe, SmartBolts makes tension-indicating fasteners that show actual bolt tension at a glance through a patented red-to-black visual system. Manufactured by Industrial Indicators in Frederick, Maryland, the company has spent more than 30 years developing custom bolting solutions for demanding industrial applications. SmartBolts are made under ISO 9001:2015 certification and have been recognized among Frederick’s Top 50 manufacturers.
ISO 9001:2015
SmartBoltsFrom its Frederick, Maryland headquarters, SmartBolts makes tension-indicating fasteners that show actual bolt tension through a patented red-to-black visual system. The technology was developed by aerospace engineer and inventor Charles H. “Chuck” Popenoe, whose original direct-tension-indicator concept led to SmartBolts, now used in demanding applications worldwide. Manufactured by Industrial Indicators, the company has supplied SmartBolts for more than 30 years and operates under ISO 9001:2015 certification.GAITHERSBURG, MD
The Auto Bolt CompanyFounded in 1948, The Auto Bolt Company has been family owned and operated since 1996, building its identity around more than seven decades of bolt-making in Cleveland. Its 70-plus employees work from a 130,000-square-foot facility to produce American-made cold-heading fasteners, with engineering support for customers who need parts made to a print rather than selected from a catalog. ISO 9001:2015 certification and an onsite quality lab support its work for industrial customers.CLEVELAND, OH
Master Bolt, LLCMaster Bolt, LLC began in 1984 making a single railroad bolt and has since built its identity around solving specialized hardware needs from its Elyria shop. Today, the company makes custom industrial fasteners for customers across the United States and ships worldwide, with in-house tooling that supports unusual specifications and applications.ELYRIA, OH
HYTORCFounded in 1968 by John Junkers, family-owned HYTORC develops industrial bolting systems designed to make tightening work safer, more precise, and less time-consuming. Based in Mahwah, New Jersey, the company combines patented tooling and custom solutions with mobile service, authorized repair facilities, and support from representatives in more than 100 countries.PERRYOPOLIS, PA