STOCKHOLM, April 26 (Reuters) - Sweden's SKF, the world's biggest maker of industrial bearings, reported adjusted first-quarter earnings that topped market expectations on Friday and said it expected a mid-single-digit organic sales decline in the second quarter.

The manufacturer, whose bearings are sold into a vast range of products globally, said it expected markets to remain volatile amid geopolitical uncertainty and stood by its guidance for a small drop in like-for-like sales this year.

SKF reported adjusted operating earnings of 3.30 billion Swedish crowns ($303 million) in the quarter compared to 3.48 billion a year ago and above a mean forecast of 3.11 billion, according to a LSEG compilation of analyst estimates.

($1 = 10.8846 Swedish crowns) (Reporting by Niklas Pollard, editing by Stine Jacobsen)