Joe Sewell was the hardest strikeout ever. He struck out 114 times in his entire career. In 1925 he struck out only 4 times in 608 at bats. Sewell holds the record for the lowest strikeout rate in major league history, striking out on average only once every 62.5 at-bats, and the most consecutive games without a strikeout, at 115.
Man — you beat me to it. I just posted almost the exact same thing here on this thread. LOL.