Diamond Manufacturing Company
Perforated and Value Added Metal Specialists

Diamond Manufacturing is your complete solution for your perforating and fabricating needs from start to finish.

Diamond Manufacturing is a wholly owned subsidiary of Reliance, Inc. (NYSE: RS), a leading diversified metal solutions provider and the largest metals service center company in North America.

Capable of custom engineering and perforating more than 4,000 patterns across more than 50 perforating presses all on site, Diamond produces tolerances tighter than industry standards on sheet, coil, and fabricated and finished products.

Our versatility to meet the needs of volume OEM buyers, local job shops and every customer in between has made Diamond Manufacturing the largest and leading perforator of metals in North America.

People Behind the Name

Our culture is grounded in the family nature of our business. We are a community of metal-loving, hole-punching and custom fabricating go-getters with approachable dispositions. We are engineers who have been serving companies like yours since 1915.

We combine the strength and leadership excellence of Reliance, Inc. with Diamond’s easy-to-work-with, small-town culture of commitment to always be fair, get the job done right, and treat everyone like family.

Diamond Manufacturing Company Team


History & Milestones

Explore the history of Diamond Manufacturing from its humble beginnings in 1915 when it served the local coal mining industry in Pennsylvania to the twenty-first century when it was acquired by Reliance, Inc. and expanded into a family of companies. Discover how our diversification of services and integration of value-added capabilities has transformed Diamond into the leading perforator in North America today.

Family of Companies

Diamond continues to drive increased innovation across more industries and strategically serves more manufacturers, contractors, fabricators and distributors through its expansion, acquisition and integration of its family of companies.


Diamond Manufacturing Company

Perforated Metals Plus

Ferguson Perforating Company

McKey Perforating

Diamond Manufacturing by the Numbers


year founded


tons of steel perforated per month


perforating presses in operation


perforated patterns in stock


average years employment tenure


total square feet across all locations


quality rejection rate


total family locations across the US

Diamond Manufacturing Company

Diamond Manufacturing is a wholly owned subsidiary of Reliance, Inc.

Reliance, Inc.

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Site designed and developed by Blair Inc.