The U.S. fastener industry faces a double threat from tariffs announced by President Donald J. Trump.

Most notably, the industry is grappling with uncertainties surrounding the 25% tariff on steel imports and 10% tariff on aluminum imports that Trump abruptly announced in March. The metals tariffs are often referred to as “232” tariffs because the applicable metals have been deemed to “threaten to impair the national security,” as defined by Section 232 of the Trade Expansion Act of 1962.

The White House has refused to issue blanket exemptions for U.S. allies, preferring instead to provide 30-day reprieves while those countries attempt to negotiate long-term arrangements with the U.S.

The next deadline for the 232 tariffs is June 1.

In addition to the looming 232 tariffs, the fastener industry is also grappling with the fallout from an additional set of tariffs that may or may not be initiated.

“Tuesday was supposed to be the day Corporate America and its lobbyists went on high alert for Trump to follow through on his plan to slap duties on at least $50 billion in Chinese imports,” Bloomberg reports.

The additional duties have been put on hold while the U.S. and China continue bilateral trade talks aimed at reducing China’s trade deficit with the U.S.

“I don’t think we’re saying tariffs are over — far from it,” said White House economic adviser Larry Kudlow.

If enacted, the duties include iron or steel nuts (HS code73181600), which would face a 25% tariff in the event the duties were enacted by the U.S. Trade Representative, a wing of the White House.

“The administration never gave itself a deadline for when it would impose tariffs on Chinese goods,” according to Bloomberg. “There’s also no date by which the 301 probe will automatically expire.

“In other words, it’s far too early to declare Trump’s China tariffs a dead letter.”

In the U.S., more than 3,500 exclusion requests related to the 232 tariffs have been filed with the Commerce Department, according to Regulations.gov, though only about 550 have been made available for public comment. Once public, domestic steel manufacturers have 30 days to file an objection.

But currently there is no process in place to exclude products that fall under the 301 tariff designation. Nor is it clear under what conditions the 301 tariffs might be withdrawn.

The White House delayed enactment after reaching some understanding to establish the framework of a future trade deal with China. However, media outlets have noted that the understanding was “vaguely worded and lacked numerical commitments or any firm details.”

In the mean time, the 301 tariffs remain a threat to the U.S. fastener industry, creating an open-ended uncertainty.