About Us

The company traces its roots to its formation in 1922 by Frank Calandra Sr. and Mary Calandra. At the time, the company bought and sold scrap to the Pittsburgh area steel producers. Over the years, it evolved into the distribution of rail products to the local coal mines near Cresson, PA. Frank Calandra Jr., changed its focus to roof support products and in 1972 Frank and his brother, Jack Calandra, formed JENNMAR, as subsidiary of Frank Calandra, Inc. Over time, FCI grew to own JENNMAR, JLOK, and JM Steel. In 2013, Tony Calandra formed Calandra Group to house future offerings in adjacent product offerings and industries. These major investments include JENNCHEM, XCAL TOOLS, XCAL INDUSTRIES, JENNMAR Services, and JM Conveyors. In 2024, all of FCI’s and Calandra Group’s holdings were consolidated under a single holding company – JENNMAR Holdings.  

Today, the JENNMAR family of companies has manufacturing expertise in Steel Roof Support, Ground Stabilization Chemicals, Roll Forming, Value Added Steel Service, ventilation, and carbide tools for Mining, Milling, and Metal Cutting. It offers a range of US manufactured products to the Mining, Tunneling, Construction, Solar, Agriculture, Forestry, Machining, and Conveyance industries. It also provides installation services for chemical roof support and ground consolidation chemicals and temporary labor services to a range of industries. 

In 2024, all of Frank Calandra, Inc. (FCI) and Calandra Group’s holdings were consolidated under a single holding company by Tony Calandra forming Jennmar Holdings, LLC. JENNMAR Holdings was formed to consolidate and house all future investments in Chemical, Manufacturing, Metal Cutting, Industrial Fabrication, Machining, Labor Services, Oil and Gas, and Conveyance industries. 

Today, JENNMAR Holdings major investments include JENNMAR, J-LOK, JM Steel, JENNCHEM, XCAL TOOLS, XCAL INDUSTRIES, JENNMAR Civil, JENNMAR Services, and JM Conveyors. 

We are a diversified manufacturer and services provider for above and below-ground infrastructure that sets standards in terms of quality and safety for our stakeholders. Our mission is total customer support and satisfaction.

FCI and CG companies set the bar in every industry we serve. Our companies invest heavily in Research and Development. The well-being of our 4,000 employees is paramount in our business model. We appropriate a vast portion of our profits back into our property, plant, and equipment, keeping our stakeholders' best interests in mind. Our employees are held to their value pledge and are to complete their tasks with integrity and stewardship for the environment. Our products enhance productivity levels for our clients and make modern life possible. We commit to our customers that our products will embody SAFETY, SERVICE, and INNOVATION.



Safety Pledge