Records for steals and on-base%?

Question

What is the MLB record for steals in a single season, and the MLB record for OBP% in a single season?

Answer 1

The steals record depends on whether you're counting pre-1900 or only the modern era. Hugh Nicol has the official record with 138 in 1887, while Rickey Henderson has the modern record with 130 in 1982:

http://www.baseball-reference.com/leaders/SB_season.shtml

The OBP record is Bonds' .609 in 2004, which beat his previous record of .582 set two years before that:

http://www.baseball-reference.com/leaders/OBP_season.shtml

Answer 2

Steals: Rickey Henderson 1982 - 130 steals in 172 attempts

OBP%: Barry Bonds 2004 - .609 OBP