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FOCUS-U.S. trade war fears ripple through China's "workshop of the world"

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* Trade war could lead to wave of China factory closures - owners

* Factories may shift warehousing or production abroad

* Loopholes could be exploited to get around tariffs

* Extra costs to be passed on to U.S. clients and consumers

By James Pomfret

DONGGUAN, China, April 13 (Reuters) - Allan Chau, the general manager of a Chinese factory making precision metal parts for U.S. customers, is still calling it a "proposed" trade war, but that hasn't stopped him from planning for the worst.

Unlike last year, when U.S. President Donald Trump sounded protectionist warnings that were largely dismissed as bluster, Chau and other factory bosses across China say the risks from this trade spat are now far more tangible.

As a result they warn of a possible wave of small factory closures, a shift of some production away from China, and the use of questionable practices to dodge increased tariffs.

"Before, we didn't think we're affected because we're doing little metallic parts," said Chau at his three-storey beige-colored-plant in Dongguan. "(Now), everybody is talking about this proposed war."

The city of Dongguan is one of the main export hubs in southern China's Pearl River Delta. The region has been dubbed the "workshop of the world" and accounts for around a quarter of China's exports.

As hundreds of computer-controlled lathes hummed around him, fashioning slender aluminium, steel and brass rods into intricate parts, Chau pointed out a car valve, the size of a thumb - used in car braking systems assembled in U.S. plants - as an example of a product caught up in the storm.

Of the 1,500 or so metal parts made in Chau's plant, including needles for espresso machines to puncture coffee capsules, he says around 200 could be hit by the proposed U.S. tariffs that stand to affect $50 billion worth of Chinese goods.

"If they're going to propose 25 percent tax on those things, we have a lot of counter-measures we've got to do to keep ourselves alive," said Chau, whose company, Tien Po International, has run factories in China for more than 30 years.

Chau says he's now considering building a warehouse in Malaysia, Vietnam or Thailand, where he could ship his goods for re-export, or he talks of setting up a small factory in a Southeast Asian country to avoid the increased tariffs altogether.

EXACERBATE THE PAIN

China's reliance on exports as an economic driver has declined over the past decade, with total exports as a percentage of Gross Domestic Product dropping to 18 percent in 2017 from 35 percent in 2006, according to research by Credit Suisse.