Lancashire second XI player Jordan Clark hit six sixes in an over against Yorkshire in Scarborough on Wednesday.
It is the first time in Lancashire's history that a member of their staff has achieved batting's maximum and it is believed to be the first time the feat has been achieved in county second XI cricket.
All-rounder Clark, 22, hit his maximum off the left-arm spin of Yorkshire's Gurham Randhawa who - until that over - had returned figures of 2-15 off 12 overs.
All six of his shots were slog-sweeps over the mid-wicket boundary.
Clark, a product of Sedbergh School in Cumbria, is hoping to break into Lancashire's one-day first team this season - and his huge hitting against the Tykes will have done his chances a power of good.
Sir Garfield Sobers was the first to achieve the feat in first-class cricket back in 1968, while Ravi Shastri, Herschelle Gibbs and Yuvraj Singh have also done it.