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PA
Stella-Jones produces treated wood products for North American infrastructure and construction markets. It supplies more than 12 million pressure-treated wooden crossties annually and treats residential lumber for outdoor applications.
Built on aerospace and defense work dating to 1932, Stellant Systems manufactures critical spectrum and RF power-amplification products for space, defense, medical, scientific and industrial applications. Established in 2021 from the former L3Harris Electron Devices and Narda Microwave-West businesses, the company now has approximately 1,100 employees across five domestic manufacturing facilities. Its Torrance and Williamsport operations include substantial production and test capabilities, with facilities certified to ISO 9001 and AS9100 standards.
Established in 1978, Stellar Precision Components machines critical aerospace and industrial components, pairing multi-axis CNC work with in-house nondestructive testing and inspection. The Jeannette company employs more than 65 people, including Journeyman Machinists and Technicians, and invests in apprenticeship programs and partnerships with Western Pennsylvania schools and training centers. Stellar is women-owned, with AS9100 Rev. D and ISO 9001:2015 quality certifications and ITAR registration.
From its hometown of Tyrone, Pennsylvania, Steller Floors makes real solid-wood flooring that floats over the subfloor without nails or glue. Its patented clip-and-assembly system lets homeowners or professionals install, remove, and replace individual planks, while the flooring itself is milled and manufactured entirely in the USA from regionally sourced wood. The team draws on more than 100 years of combined wood-products experience.
Stello Foods began in 1990 with Rosie’s Sweet Pepper Spread, a Villella family recipe, and has grown from a Punxsutawney basement kitchen into a Pennsylvania food manufacturer. The company makes homestyle foods under its Rosie’s line while also producing family recipes for other businesses through contract packaging and private-label services. It says it sources fresh produce locally from Pennsylvania farmers when it is in season.
Founded in 1993 by hematopoietic stem-cell researcher Dr. Allen Eaves, STEMCELL Technologies grew from his effort to produce standardized, cost-effective cell culture media into a global biotechnology company. Based in Vancouver and guided by its “Scientists Helping Scientists” ethos, the company supports life-science researchers worldwide with tools and expert assistance for cell-based research. Its quality management system is certified to ISO 13485:2016 and ISO 9001:2015.
Stenner Pump Company has manufactured peristaltic metering pumps in the United States since 1957. The veteran-owned company says most pump components are designed and manufactured at its Jacksonville, Florida headquarters, where production continues from raw goods through final assembly.
With more than a decade of expertise, US-based STEQ America LLC supplies advanced equipment and engineering support for pharmaceutical and biotechnology manufacturing. The company pairs European and domestic technologies with US-based in-house service, guiding customers from equipment selection and installation through validation, maintenance, and ongoing operational support. STEQ America is also the exclusive North American partner for Elettracqua’s pharmaceutical water and steam systems.
STER Seating LLC makes passenger seats and mobility-aid securement systems for public transportation, carrying forward the Ster group’s 30-year seating reputation through a new company formed with former USSC passenger-seating leadership. Based in Exton, Pennsylvania, the company serves transit operators worldwide through seven production facilities and four assembly plants. Its seats are certified for safety, fire retardancy, and durability, and more than 14 million have been produced for journeys on five continents.
Since Edward A. Stiller founded it in 1938, Steril-Sil has been known for rethinking how foodservice operations handle silverware. The Pennsylvania manufacturer still makes its equipment in the U.S.A., carrying forward the original silverware cylinder and the later E1 System for commercial kitchens and foodservice operations.
Sterilizer Refurbishing Services Inc. cleans sterilizer chambers on-site and manufactures and repairs allied equipment for hospital and life-science sterilizers. Based in Erie, the woman-owned small business has more than 30 years of experience, using a proprietary hand-polishing process performed by factory-trained technicians. Its work covers both chamber cleaning and the loading equipment that supports sterilization operations.
STERIS Life Sciences grew from the American Sterilizer Company, whose steam-sterilization work began in Erie, Pennsylvania, in 1890. Today, its scientific professionals help pharmaceutical and other life-sciences manufacturers control contamination through validated products and tailored technical support.
STERIS is a global provider of healthcare and life sciences products and services, with infection prevention and patient care at the center of its business. The company says its workforce exceeds 16,000 employees and describes designing and manufacturing products alongside services intended to support healthcare, pharmaceutical, biotechnology, and research settings.
Founded in 1991, Sterling Computer Sales is a Pennsylvania company known for building portable computer systems for work in the field. Its custom rugged systems serve government and military users as well as organizations that need specialized computing outside a conventional office.
Sterling Helicopter is an FAA Part 145 Repair Station providing helicopter maintenance, component overhaul, avionics, engineering, and STC services. The company also operates an FAA PMA manufacturing facility for parts and STC kitting.
Sterling Machine Technologies, Inc. is a Palmyra machine shop that makes precision-machined parts and provides custom fabrication and welding. Founded in 1987, the company grew from Randy Herr and his brother Brian working part time into a full-time operation; it reports 37 full-time employees and operates a dedicated weld building.
Sterling began in a garage in 1907 and grew from a Crafton, Pennsylvania, maker of boiler stands and gas valves into a Kohler brand serving trade professionals. Today, it makes practical plumbing products for bathroom and kitchen projects, with Vikrell baths and showers assembled at its Huntsville, Alabama, plant. Its identity remains rooted in durable, straightforward products intended to make installation easier.
Since July 1992, Mark and Andee Weller’s Sterling Upholstery Co. has restored and refinished furniture while creating custom upholstery in northeastern Pennsylvania. The Moscow-area shop is particularly known for bringing antiques and heirloom pieces back into use, alongside its fine upholstery and restoration work.
Founded in 1949, Stevanato Group is an Italian company known for more than 75 years of work in pharmaceutical glass packaging and integrated support for drug manufacturers. Its Zhangjiagang site, launched in 2012, extends that manufacturing base to Asia-Pacific pharmaceutical companies and CDMOs, producing vial systems and related inspection equipment.
Steve Schwartz Associates, Inc. is a Pittsburgh printing and promotional-products business that produces custom printed materials for businesses and organizations. It says it has more than 40 years of experience producing menus and also offers in-house graphic design to help create printed pieces.