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A privately held, family-owned manufacturer with Akron roots dating to 1941, Diamond America Corporation remains under the leadership of third-generation owner Mike Magee. From its Mogadore facility, the company serves processors worldwide with custom extrusion equipment and related engineering support, including testing in a 2,000-plus-square-foot lab. Its work now reaches more than 70 countries while retaining a distinctly Ohio-based manufacturing identity.
Diamond Door, also identified as Ohio Door Company, makes custom interior wooden doors in its own Ohio facilities. Located in the heart of Ohio’s Amish region, the company describes its work as hand-crafted and designs doors to customer specifications, including fire-rated options built by Ohio Custom Fire Door exclusively for Diamond Door.
Diamond Electric Mfg. Corp designs, manufactures, and distributes automotive electrical components, with U.S. production centered at its Eleanor, West Virginia plant. Founded in 1937, Diamond Electric traces its history to Inosuke Tomita and says its U.S. ignition-coil production began in 1997. Its U.S. operations also include a research and sales office in Farmington Hills, Michigan.
Established in 1955, Diamond K Inc. operates a Scranton recycling center that sorts, processes, and ships recovered paper and plastic to mills across the United States and Canada. Its 125,000-plus-square-foot warehouse, fleet of trucks, and more than 100 trailers support both community drop-off services and industrial recycling throughout the Northeast. The company also provides licensed and bonded confidential document destruction, with certificates of destruction available on request.
Diamond Kinetics is a sports technology company developing connected-device and motion-analytics technology for youth baseball and softball development. Its products include a bat-mounted swing sensor and sensor technology integrated into a Marucci smart bat, paired with an iOS app for evaluating swings and supporting player development. The company identifies itself as the Trusted Youth Development Platform of Major League Baseball and says its technology is used by baseball and softball organizations.
Since 1915, Diamond Manufacturing Company has perforated metal and produced custom-fabricated parts, growing from a Pennsylvania supplier to a national operation with more than 50 presses and over 4,000 perforation patterns. Its engineers handle projects from prototype through finished, assembly-ready products, with precision work supported by an ISO-certified quality system. Diamond is a wholly owned subsidiary of Reliance, Inc.
Founded in 2010, Diamond Manufacturing of Bluffton is a family company that provides metal fabrication, machining, and assembly services from its 95,000-square-foot facility in Northwest Ohio. The company serves automotive and agricultural OEMs, along with Tier 1 suppliers, handling projects from prototypes to high-volume production and building material-handling racks among other custom work. Its welders hold D1.1 and D1.6 certifications.
Known across the Midwest and beyond for its service-centered approach, Cleveland-based Diamond Metals Distribution supplies prepared metal to tool and die shops, mold shops, machine shops and other manufacturers. The company stands out by handling much of the preparation in-house, including pre-squared finishing, so customers can put material to work with less shop-floor labor.
Established in 1911, Diamond Packaging develops and manufactures innovative folding cartons, pairing structural design with decorative effects for brands ranging from Anna Sui to Billie Eilish. The Rochester company is a WBENC-certified women-owned business led by CEO and owner Karla Fichter, and its Greenbox initiative emphasizes sustainable packaging design, materials, and manufacturing. Diamond’s carton plant is ISO 9001:2015 certified and FSC Chain of Custody certified.
After being stranded twice by broken starter cords, founder and CEO Paul Abell built Diamond Performance Ltd. around durable consumer products that keep small engines and essential footwear in service. The company’s Diamondcord starter cord and Diamondlace boot laces are made in the USA and backed by a no-hassle lifetime guarantee, with independent testing showing Diamondcord averaging more than 1.4 million pulls and Diamondlace lasting over 200,000 cycles.
Diamond Products is one of the largest diamond tool and equipment manufacturers in the United States, supplying the construction industry for more than 50 years. The company emphasizes a broad selection of diamond tools and equipment, including customized products, supported by a seasoned field sales organization.
Diamond Roll Up Door, Inc. makes roll-up doors, including proprietary truck and trailer doors. Its product range also includes architectural coiling doors, which it says are designed to suit customer needs and facility applications.
DIAMOND SA designs, manufactures and assembles high-performance fiber-optic components and assemblies from its dedicated facility in Losone, Switzerland. With more than 40 years in the field, the company is the inventor of the E-2000® connector and built its own Active Core Alignment technology, machinery and vertically integrated production to achieve precise, repeatable fiber connections. Its 13,500 m² operation includes ISO 5–7 cleanrooms and supports demanding applications ranging from photonics and quantum technology to aerospace and medical systems.
Diamond Saw Works, Inc. manufactures industrial Sterling saw blades, continuing a Buffalo-area business founded in 1890 by engineer John T. Ronan and Joseph Campbell. The company has evolved from making hacksaw blades and saw machines to producing industrial-grade blades in Chaffee, New York, and says its employees own 60% of the company through its ESOP.
Diamond Select Brands curates and distributes collectible toys for fans who want highly detailed, character-driven pieces rather than ordinary playthings. Its catalog brings together selected brands from across the international collectibles scene, giving enthusiasts access to specialty lines from companies such as JoyToy, Kotobukiya, and Good Smile Company.
Diamond Signs and Graphics is a Warrensville Heights sign maker that turns organizations’ brands into exterior and interior signage, vehicle graphics, and other custom visual communications. The six-year-old company brings more than 40 years of combined team experience to each project, working from a climate-controlled facility with year-round vehicle-graphics capability. Its work ranges from illuminated signs to dimensional interior lettering and graphics, with the team guiding customers through design and production.
A family legacy in metal manufacturing shapes Diamond Storage Solutions, whose roots trace to Emil Krill’s 1913 Diamond Foundry in Akron, Ohio. Today, Jennifer Nageotte and Terry Elliott carry that tradition forward by creating simple, customer-led storage solutions for industrial and healthcare workplaces, drawing on more than 25 years of experience in material handling and lean practices.
Since beginning reforestation work in Costa Rica in 1993, Diamond Tropical Hardwoods has supplied and handcrafted sustainably sourced tropical hardwood products, with a particular focus on teak planters, garden pieces, lumber and custom woodwork. The family-owned company operates a Pennsylvania warehouse and uses a direct supply chain, while directing purchases toward planting more trees. Its lumber carries FSC certification with chain of custody, and its teak planters use marine-grade stainless steel hardware for outdoor durability.
Diamond Wipes International is a USA-based contract manufacturer of wet wipes, disinfectant wipes, and personal care products, serving brands, retailers, and distributors across North America since 1994. The company manufactures over 2,000 products across beauty, baby, health, household, men's care, and pet categories, producing more than 45 million units per month from its FDA-registered, EPA-registered, and ISO-certified facilities in Chino, CA and Fredonia, WI. With over 30 years in business, 420+ employees, and 55+ production lines, Diamond Wipes provides turnkey services from formulation and R&D through production, packaging, and quality assurance.
Founded in Pittsburgh in 1939, Diamond Wire Spring Company designs and manufactures industrial custom and stock springs and wire forms. Still independent and third-generation family-owned, the American manufacturer serves customers from three ISO 9001:2015-certified plants and a stock warehouse, with thousands of springs available for same-day shipment. Its long history includes specialized work for demanding fields such as rail transportation and medical equipment.