ST. LOUIS — The Boeing Co. extended a new contract offer to its striking St. Louis machinists on Wednesday. But the union leaders representing the workers swiftly rejected the new plan.

The revised offer from Boeing came on Day 80 of the strike at the company’s St. Louis defense manufacturing facilities, following two days of involvement by a federal mediator.

“We will not vote on an insulting offer,” the union said in a message to members.

Boeing Vice President Dan Gillian criticized leaders of the International Association of Machinists and Aerospace Workers District 837 in a message to workers.

“Unfortunately, after talking for weeks about your democratic process, IAM leadership is refusing to allow you to vote on this offer and the chance to end the strike,” Gillian said.

The company previously offered a $4,000 ratification bonus and a 24% general wage increase over five years.

Union members have pre-approved a contract that calls for a $10,000 ratification bonus and a 20% general wage increase over four years — plus raises for senior employees who were set to receive lump sum payments for part of the contract.

Boeing’s latest offer, according to Gillian, would give workers a $3,000 ratification bonus in the first year, as well as $3,000 in Boeing stock on Oct. 31.

Another $1,000 retention bonus would be provided in the fourth year of the contract.

Senior employees would still receive a lump sum payment for one year of the contract, but would get a 1.5% general wage increase and a lump sum payment in the second year of the contract.

Boeing has previously vowed not to budge on the overall cost of the contract.

“To increase money in those key areas, we had to make trade-offs,” Gillian said Wednesday.

Said the union in a message Wednesday afternoon: “The company made an offer that had no meaningful improvements in the areas our members have told us and the company they care about — retirement security, ratification bonus and top-of-scale wage growth.

The message added that the company is insisting on a fifth year to the contract “despite adding no additional value to the fifth year.”

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