BEIJING--A preliminary gauge of Chinese manufacturing activity reached an 18-month high in July, in a sign that Beijing's efforts to stimulate the economy are having an impact.

The HSBC preliminary, or flash, manufacturing Purchasing Managers' Index rose to 52 in July from 50.7 a month earlier, according to data released Thursday by HSBC Holdings PLC and data firm Markit. It marked the second consecutive month that the index topped the 50 mark, which separates expansion from contraction compared with the previous month.

Economists said the reading was surprisingly strong and credited the government's efforts to ease monetary policy and speed up infrastructure investment. "The strong flash PMI points to the robust growth momentum in the world's second-largest economy due to the government's stimulus measures," said Lu Ting, an economist at Bank of America Merrill Lynch.

The reading cheered markets in Asia. Hong Kong stocks rose modestly to hit their highest level in more than three years. The Shanghai market was moderately higher in morning trading after the data was released.

The improving data followed a series of government stimulus policies tailored to support China's cooling economy, which expanded by 7.5% in the second quarter after 7.4% growth in the first. By comparison, China's economy was growing by 7.7% at the end of last year.

Beijing has set a target of about 7.5% growth for the full year, but Premier Li Keqiang has signaled recently that the government could accept growth slightly higher or lower than 7.5% as long as employment remains at healthy levels.

China has refrained from using massive stimulus measures, as it did during the global financial crisis in 2008 to 2009. Instead, it has rolled out a raft of small stimulus policies, including cutting the amount of cash banks must hold in reserve to encourage more lending, stepping up spending on railways and offering tax breaks for small firms.

Economists said the government's recent policies appear to have lifted small firms, as the HSBC PMI is weighted toward smaller and private enterprises.

In July, HSBC's subindexes for new orders as well as output were higher, though employment remained weak.

"Economic activity continues to improve in July, suggesting that the cumulative impact of mini-stimulus measures introduced earlier is still filtering through," HSBC economist Qu Hongbin said in a statement.

Better demand for Chinese goods from abroad as the U.S. and European economies strengthen may also be helping to lift the economy.

"China's export sector is acting as an underappreciated tailwind to growth in 2014," said Bill Adams, an economist at PNC Financial Services. "It was only a matter of time before stronger demand in China's advanced economy export markets passed through to stronger manufacturing output in China."

Zhang Fan, an economist with CIMB Securities, said the government needs to step up its supportive policies if it wants the rebound to last.

"If you look at other indicators like commodity prices and electricity consumption, they are not that good," he said. "The recovery in demand may still be quite fragile."

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

Grace Zhu and Richard Silk

HSBC (NYSE:HSBC)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more HSBC Charts.
HSBC (NYSE:HSBC)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more HSBC Charts.