Window fastener

A window fastener including:

• i. a base configured for connection to a window sash;
• ii. a handle carrying a latching tongue, pivotally connected to the base to pivot, about an axis, between a latched position and an unlatched position;
• iii. an interface between the base and the handle;
• iv. a washer between the base and the handle, wherein the washer is rotationally aligned with the handle;
• and
• v. a rear washer,
• wherein the interface causes the latching tongue to move axially, with respect to the axis, closer to the base when the handle pivots from the unlatched position to the latched position;
• wherein the interface causes the latching tongue to move axially, with respect to the axis, away from the base when the handle pivots from the latched position to the unlatched position;
• wherein the interface includes a cam surface;
• wherein the cam surface is a surface of the base and includes at least a closed bearing surface, a lifting surface, and an open bearing surface;
• and
• wherein the washer has a surface complementary to the cam surface of the base such as to overlap with the base, in use, when the fastener is in a latched position;
• wherein the rear washer is positioned behind the cam surface of the base and rotationally aligned with the handle;
• wherein the rear washer includes at least a closed bearing surface, a lifting surface, and an open bearing surface;
• and
• wherein the closed bearing surface, the lifting surface, and the open bearing surface of the cam surface respectively have the same profile as the closed bearing surface, the lifting surface, and the open bearing surface of the rear washer.