Thai Siam Cement prices 4-yr bond coupon

BANGKOK, Feb 25 (Reuters) - Siam Cement PCL SCC.BK, Thailand's top conglomerate, has set a coupon of 4.25 percent for a bond issue of up to 20 billion baht ($620 million) to refinance maturing debt, an underwriter said on Monday.

The 4-year bond, rated "A+(tha)" by Thailand's Fitch Ratings, was priced at a spread of about 83 basis points over comparable government bonds, the underwriter, who declined to be named, told Reuters.

Benchmark four-year government bonds <THLB11NA=> yielded 3.43 percent on Friday in the secondary market.

The Siam Cement bonds would open for subscription to existing bondholders and the public from March 3 to 31 and be issued in early April.

The underwriters of the issue include Siam Commercial Bank SCB.BK, Kasikornbank KBAN.BK, Bangkok Bank BBL.BK and Bank of Ayudhya BAY.BK. ($1=32.30 Baht) (Reporting by Arada Therdthammakun; Editing by Michael Battye)