Charlesbank Capital Partners has purchased HDT Global from Metalmark Capital for an undisclosed amount.

HDT, headquartered in Solon, Ohio, produces shelters, generators, heaters, air filtration devices, robotics and other engineered technologies, used by U.S. and allied military units worldwide, as well as civilian government and commercial customers.

The company was backed by Metalmark Capital, which focuses on energy, health care and industrial companies. The firm has about $2.5 billion in committed capital.

Charlesbank, headquartered in Boston, manages more than $3 billion in capital. The firm typically invests between $50 million and $150 million per transaction in companies with enterprise values between $100 million and $750 million. In July, the firm closed a $1.75 billion fund. The firm's portfolio companies include Trojan Battery Company, Del Taco and OneStopPlus, which it bought in December 2012. 

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