* MSCI Asia ex-Japan eke out small gains, Nikkei hits 6-week low
* Euro hovers near 2-year low against dollar
* HSBC China flash PMI at 5-month peak on output bounce
* Spanish bill auctions eyed
* European shares seen mixed at open
By Chikako Mogi
TOKYO, July 24 Asian shares inched higher on Tuesday, helped by improving Chinese manufacturing data, but the euro remained under pressure as surging Spanish borrowing costs stoked fears that the euro zone's fourth-largest economy will be forced to seek a bailout.
The HSBC flash China manufacturing purchasing managers index rose to a five-month high in July, driven up by a jump in the output sub-index and signs of an improvement in new export orders that offered some relief to fragile markets.
Asian shares erased earlier losses while oil and copper rose after the Chinese data, pushing the commodity-linked Australian dollar up to $1.0288 from around $1.0265.
The euro also received a temporary boost before retreating to stand not far from a two-year low against the dollar and a near 12-year low against the yen.
The single currency was undermined by Moody's Investors Service changing its ratings outlook to negative for Aaa-rated Germany, the Netherlands and Luxembourg amid Europe's ongoing debt crisis.
"China's PMI data beat market expectations and gave shorts a reason to cover today," said Orient Futures derivatives director Andy Du, referring to buying by short-sellers to realise their gains on earlier bets that markets would fall.
It was the first significant Chinese data in the third quarter and signalled that pro-growth government policies may be gaining traction in the world's second-largest economy.
MSCI's broadest index of Asia-Pacific shares outside Japan edged up 0.2 percent, after spending most of the session in negative territory. It tumbled 2.4 percent on Monday for its biggest one-day drop in about two months.
Japan's Nikkei stock average also steadied after earlier slipping to a six-week low.
Brent crude rose 0.8 percent to $104.03 a barrel and U.S. crude added 0.8 percent to $88.81, while copper jumped 1.1 percent to $7,485 per tonne on China's PMI.
"The data gave a slight boost to markets, but whether such effects are sustainable are doubtful as Europe struggles with its problems," said Hiroyuki Kikukawa, general manager at trading company Nihon Unicom.
"Government policies will underpin the Chinese economy over the longer term, but in the short-term, instability in the European situation will keep a drag, especially as Europe is a big export market for China," he said.
European stocks were seen mixed and U.S. stock futures were barely changed. Financial spreadbetters called the main indexes in London, Paris and Frankfurt to open between a 0.4 percent fall and a 0.3 percent gain.
Hong Kong's stock market opened up 0.1 percent after the morning session was cancelled due to Typhoon Vicente.
CRISIS IN RISING YIELDS
The euro was at $1.2126, off a 25-month low of $1.2067 hit on Monday, and stood at 94.87 yen, barely above its lowest since November 2000 of around 94.23 yen marked on Monday.
Downside pressures remained strong for the euro, with euro zone manufacturing data due later on Tuesday likely to confirm growth deteriorating further.
Greece, which only last month staved off a deeper crisis by having pro-bailout parties win an election, was also scheduled on Tuesday to meet its troika of creditors - the European Union, European Central Bank and the International Monetary Fund - to renegotiate rescue payments that are crucial to keeping indebted Athens afloat and within the euro zone.
Fears about Spain possibly needing a fully-fledged bailout intensified investor flight to safety and pushed the 10-year U.S. Treasury yield down to a record low 1.3977 percent, while five- and 10-year German government bond yields also set new lows on Monday.
In contrast, Spanish 10-year borrowing costs surged to a euro-era high above 7.5 percent on Monday.
Andrew Wilkinson, chief economic strategist at Miller Tabak & Co in New York, said the flattening of the Spanish yield curve reflected how investors have grown increasingly concerned about perceived risks facing Spain.
"Rising yields are in turn adding to a sense of crisis: If the regions ask for cash, how will the government fund itself? The brave Spanish matador appears to be pinned to the perimeter fence by the angry bull," Wilkinson said.
Spain faces a litmus test later on Tuesday with debt sale of 3 billion euros in 3- and 6-month bills.
Asian credit markets recovered slightly as other assets trimmed losses, with the spread on the iTraxx Asia ex-Japan investment-grade index wider by just 1 basis point.
Gold was capped, up 0.1 percent at $1,577.55 an ounce, with both its 55- and 100-day moving averages having crossed below the 200-day moving average in April to imply a bearish technical outlook. Analysts expect gold to find support at its 2012 low near $1,521 and resistance at $1,641.
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