Universal Tube & Rollform Equipment Corporation said the cost of hosting its website -- utube.com -- has grown significantly in the past two months.
"We've had to move our site five times in an effort to stay ahead of the youtube.com visitors," said Ralph Girkins, Universal Tube's president.
The lawsuit, filed this week in US District Court, asks that YouTube stop using the youtube.com or pay Universal Tube's cost for creating a new domain. It did not specify damages.
Universal Tube, which sells used machines that make tubes, has said it has lost business because customers have had trouble accessing its site.
"We were there first by 10 years," Girkins said.
The confusion took off a couple of months ago, Girkins said.
The company, with just 17 employees, got 68 million hits on its site in August, making it one of the most popular manufacturing websites.
The site shut down in early October just before Google announced plans to buy YouTube for $US1.65 billion ($A2.2 billion). It took several days before it was back up.