A belt buckle for an aircraft safety belt, wherein the belt buckle comprises: - a main body defining a receiving space for at least partially receiving a buckle tongue of an aircraft safety belt; - a mount configured for fixing a belt strap of the aircraft safety belt by winding it around, wherein a length of the aircraft safety belt is adjustable by displacing the belt strap on the mount; and - a locking device configured for latching the buckle tongue at the main body in a position at least partially inserted into the receiving space for closing the aircraft safety belt; wherein the main body comprises a base plate and, at two opposite sides, lateral supports protruding therefrom, wherein the base plate and the lateral supports at least partially limit the receiving space, and the base plate forms a substantially flat base area; wherein the mount is translationally movably mounted at the lateral supports and a clamping edge of the base plate facing the mount protrudes from the base area in the direction of the mount, the mount thus being pulled towards the clamping edge when a tensile load is applied to the belt strap and the belt strap being clamped between the clamping edge and the mount, thus blocking a change in length of the aircraft safety belt; wherein the mount comprises a pin member which is translationally movably mounted in respective elongate through holes of the lateral supports, characterized in that the mount comprises a sheath which is snapped onto the pin member and configured in order for the belt strap to be wound around it; and wherein the main body is formed from an aluminum material, the pin member is formed from a metallic material, and the sheath is formed from a plastic material. - a main body defining a receiving space for at least partially receiving a buckle tongue of an aircraft safety belt; - a mount configured for fixing a belt strap of the aircraft safety belt by winding it around, wherein a length of the aircraft safety belt is adjustable by displacing the belt strap on the mount; and - a locking device configured for latching the buckle tongue at the main body in a position at least partially inserted into the receiving space for closing the aircraft safety belt; wherein the main body comprises a base plate and, at two opposite sides, lateral supports protruding therefrom, wherein the base plate and the lateral supports at least partially limit the receiving space, and the base plate forms a substantially flat base area; wherein the mount is translationally movably mounted at the lateral supports and a clamping edge of the base plate facing the mount protrudes from the base area in the direction of the mount, the mount thus being pulled towards the clamping edge when a tensile load is applied to the belt strap and the belt strap being clamped between the clamping edge and the mount, thus blocking a change in length of the aircraft safety belt; wherein the mount comprises a pin member which is translationally movably mounted in respective elongate through holes of the lateral supports, characterized in that the mount comprises a sheath which is snapped onto the pin member and configured in order for the belt strap to be wound around it; and wherein the main body is formed from an aluminum material, the pin member is formed from a metallic material, and the sheath is formed from a plastic material.