Rectangular first and second floorboards, wherein each of the first and second floorboards includes first and second parallel short sides and long sides, a core, and a first mechanical locking system on the long sides and a second mechanical locking system on the short sides, the first mechanical locking system designed for joining with adjoining identical floorboards by a first mechanical connection at a long side vertical joint plane and the second mechanical locking system designed for joining with adjoining identical floorboards by a second mechanical connection at a short side vertical joint plane, the first mechanical locking system comprising:
- a first mechanical cooperator for joining a first long side of the first floorboard and a second long side of the adjoining second floorboard in a vertical direction;
- and
- a second mechanical cooperator for joining the first long side of the first floorboard and the second long side of the adjoining second floorboard in a horizontal direction, the second mechanical cooperator including a locking groove formed in an underside of the second floorboard and extending parallel with and at a distance from the long side vertical joint plane at the second long side, the locking groove having a downward directed opening, and a strip on the first floorboard at the first long side projecting from the long side vertical joint plane, the strip including a locking element at a distance from the long side vertical joint plane that projects towards a plane containing an upper side of the first floorboard and which has at least one operative locking surface for coaction with said locking groove,
- wherein the locking groove, as seen in a plane of the floorboards and away from the long side vertical joint plane has a greater width than the locking element,
- wherein at least one operative locking surface of the locking element is essentially planar and faces the long side vertical joint plane,
- wherein the locking groove has at least one essentially planar operative locking surface adapted to fit in the locking groove of the second floorboard at a distance from the opening of the locking groove and which cooperates with the locking surface of the locking element in the joined position,
- wherein the locking groove at a lower edge closest to the long side vertical joint plane has a guiding part that is inclined or rounded, the guiding part extending from the locking surface of the locking groove to the opening of the locking groove and guides the locking element into the locking groove by engaging a portion of the locking element positioned above the locking surface of the locking element or adjacent to its upper edge, and
- wherein the long sides lock by angling;
- and
- the second mechanical locking system comprising:
- a first mechanical cooperator for joining a first short side of the first floorboard and a second short side of the adjoining second floorboard in a vertical direction;
- and
- a second mechanical cooperator for joining the first short side of the first floorboard and the second short side of the adjoining second floorboard in a horizontal direction, the second mechanical cooperator including a locking groove formed in an underside of the second floorboard and extending parallel with and at a distance from the short side vertical joint plane at the second short side, the locking groove having a downward directed opening, and a strip on the first floorboard at the first short side projecting from the short side vertical joint plane, the strip including a locking element at a distance from the short side vertical joint plane that projects towards a plane containing an upper side of the first floorboard and which has at least one operative locking surface for coaction with said locking groove,
- wherein the locking groove, as seen in a plane of the floorboards and away from the short side vertical joint plane has a greater width than the locking element,
- wherein at least one operative locking surface of the locking element is essentially planar and faces the short side vertical joint plane,
- wherein the locking groove has at least one essentially planar operative locking surface adapted to fit in the locking groove of the second floorboard at a distance from the opening of the locking groove and which cooperates with the locking surface of the locking element in the joined position,
- wherein the locking groove at a lower edge closest to the short side vertical joint plane has a guiding part that is inclined or rounded, the guiding part extending from the locking surface of the locking groove to the opening of the locking groove and guides the locking element into the locking groove by engaging a portion of the locking element positioned above the locking surface of the locking element or adjacent to its upper edge,
- wherein the operative locking surfaces of the locking element and the locking groove on the short sides form a locking angle of at least 90° to an upper side of the floorboards, the locking angle opening toward the short side vertical joint plane, and
- wherein the short sides lock by a vertical snap action.