More than 100 metal workers at Jorgensen Forge in Tukwila have voted to join the Machinists union, the union announced Friday.

By a 3-to-2 margin, the hourly employees chose Thursday to be represented by District 751 of the International Association of Machinists, which also represents blue-collar workers at Boeing and BAE Systems.

“These workers came to us after seeing the benefit families can gain by having union representation,” said union spokeswoman Connie Kelliher.

The National Labor Relations Board has to certify the election before the results are considered final.

Jorgensen Forge vice president of human resources Stace Rudd said the company won’t comment before the election is certified.

Contract negotiations won’t begin until after the certification.

Jorgensen Forge, on a 22-acre property in Tukwila, forges bars, blocks, discs, sleeves and rings out of steel, titanium, aluminum and nickel. Its products go toward manufacturing in aircraft, aerospace and marine industries.

In total, Jorgensen Forge employs 240 people, according to its website.

The company was once family owned but is now owned by New York based private-equity firm Protostar Partners.

Kelliher said changes under the new management led workers to contact the Machinists union.

Brandon Brown: 206-464-2164 or brbrown@seattletimes.com