LONDON- Spain is set to raise 6 billion euros from a new 15-year bond issue on Tuesday, generating final demand of over 42 billion euros, according to a lead manager.

The bond will price at 15 basis points over Spain's existing July 2035 notes, the lead manager added in a message to investors seen by Reuters, down from around 18 basis points when the sale started earlier in the day. 

Demand fell from a peak of 62 billion euros before pricing was set.

Spain hired Barclays, BNP Paribas, Morgan Stanley, Nomura, Santander and Societe Generale for the sale on Monday.

(Reporting by Yoruk Bahceli and Abhinav Ramnarayan) ((Abhinav.Ramnarayan@thomsonreuters.com; 0044 751 745 1044; Reuters Messaging: Twitter: @abhinavvr))