SAN FRANCISCO — Right tackle Anthony Davis signed a five-year contract extension Friday with the 49ers, further solidifying a young offensive line that made major strides last season for Super Bowl runner-up San Francisco.

The deal is worth more than $37 million, with $17 million guaranteed. The 23-year-old tackle has started 16 games in each of his first three years. He helped the 49ers win consecutive NFC West titles and reach the Super Bowl last season, a 34-31 loss to Baltimore.