BEIJING--Factory activity in China weakened in August to a three-month low according to a closely watched manufacturing index, undercutting momentum as the world's second-largest economy struggles to find its feet.

The preliminary HSBC China Manufacturing Purchasing Managers Index fell to 50.3 in August, compared with a final reading of 51.7 in July, HSBC Holdings PLC said Thursday. The government's competing index also measured 51.7 in July.

The HSBC index tends to reflect the outlook among smaller private companies while the official index looks more closely at larger state-owned companies. A reading above 50 indicates expansion from the previous month, while a reading below 50 indicates contraction.

"Today's data suggest that the economic recovery is still continuing, but its momentum has slowed again," HSBC economist Qu Hongbin said in a statement. "Therefore, industrial demand and investment activity growth will likely stay on a relatively subdued path."

The subindexes for new orders and new-export orders in the preliminary August manufacturing figures compiled by HSBC and data provider Markit rose at a slower pace than in July, while the employment subindex contracted further, HSBC said.

The weakening outlook for factory output came as China attempts to put a floor under decelerating growth. China saw its economy grow 7.5% in the second quarter year over year, marginally better than the 7.4% recorded in the first quarter, its weakest pace in 18 months.

Early hopes that the worst was over and that stronger exports and recovering global demand would help turn the tide were shaken, however, by July's weak domestic investment demand and credit data.

China has responded with a range of targeted stimulus measures in recent months, including stepped-up spending on rail and public-housing projects, looser monetary policies for farmers and first-time home buyers and administrative reforms, including reduced red tape. But these haven't been enough to counter a slumping real-estate market, which accounts for over 20% of gross domestic product when construction and related industries are included, and which continues to drag down growth.

Average home prices in 70 Chinese cities fell 0.89% in July, for the third straight monthly decline. House prices fell 0.47% in June and 0.15% in May, according to the National Bureau of Statistics.

The health of the Chinese economy is being watched closely as economies in the rest of the world continue to struggle. After an abysmal first quarter, the U.S. economy grew at a stronger-than-expected 4% annual rate in the second quarter, even as the economy of the 18-member euro zone stalled in the second quarter and many Asian economies swoon.

Japan, the world's third-largest economy in nominal GDP terms, suffered its worst contraction in the second quarter since 2011, declining 6.8% on an annualized basis from the prior quarter, as a sales-tax increase blunted retail demand.

Although China's 7.5% growth would be the envy of many other countries, Beijing says it needs growth in the 7% range to generate enough jobs for its huge population.

The preliminary or "flash" reading of the PMI is based on 85% to 90% of total responses to HSBC's survey each month, and is issued about one week before the final PMI reading.

Liyan Qi, Mark Magnier

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