* Fifth round of regional talks ends with no deal
* Regional union says to recommend strikes from next week
* Employers say new union proposals were not negotiable
* Major sticking point is demand for right to shorter hours (Recasts, adds comments by union, employers)
STUTTGART, Jan 27 (Reuters) - German industrial companies face all-day walkouts by workers next week that could hamper the production of cars, car parts and machinery as 16 hours of last-ditch regional talks between union IG Metall and employers failed to yield a deal.
Nearly a million workers have already taken part in short walkouts across the country this month to support IG Metall's demands for higher pay and the right to shortened working hours, but 24-hour strikes may pose a serious risk to industrial output in Europe's biggest economy.
Employers in the southwestern state of Baden-Wuerttemberg, home to companies such as Mercedes-Benz maker Daimler and sports car firm Porsche, said on Saturday the union had made new demands in the fifth round of talks that were not negotiable.
IG Metall was now demanding an 8 percent pay rise for 3.9 million metals and engineering workers across Germany for 27 months, regional employers' association Suedwestmetall said.
The union is also asking for workers to receive the right to reduce their weekly hours to 28 from 35 to care for children, elderly or sick relatives, and return to full-time employment after two years.
Employers have offered a 6.8 percent increase but have rejected the demand for shorter hours unless they can also increase workers' hours when necessary.
"In the end, the union was not even willing to consider the costs (from workers shortening their hours) in the overall demand," Stefan Wolf of Suedwestmetall said.
DOOR STILL OPEN
IG Metall, meanwhile, blamed the employers for the lack of a deal, saying they were unwilling to lend financial support to workers who needed to take care of family members.
But the union left the door open for further discussions, with IG Metall Baden-Wuerttemberg leader Roman Zitzelsberger saying on Saturday that talks had ended but not definitely failed.
Any deal in Baden-Wuerttemberg would typically be applied in other German states as well.
Employers have warned that all-day strikes could cause serious financial damage to the country's industrial sector.
"Twenty-four hour strikes would indeed be painful," a spokesman for BMW had said ahead of the latest round of talks, adding that extended walkouts could disrupt production not only at the carmaker but also at suppliers.
Three hours of stoppages at BMW's Munich factory on Wednesday resulted in 250 cars not being assembled, it said.
Premium rival Audi, owned by Volkswagen, also said it was trying to catch up after around 700 vehicles were not assembled as a result of two stoppages at its Ingolstadt and Neckarsulm factories this week.
(Reporting by Ilona Wissenbach; Writing by Maria Sheahan; Editing by Andrew Bolton)