The invention relates to a closing screw (10) for a
projectile (100), comprising a screw body (14) extending along a central longitudinal axis (M), wherein a channel (16) is formed in the screw body (14), which extends relative to the central longitudinal axis (M) from a first side (18) of the screw body (14) to a second side (20) of the screw body (14), wherein a closing element (22) is arranged in the channel (16), which closes the channel (16) and is configured in such a way that, when a defined
limit pressure in the channel (16) is exceeded, the closing element (22) at least partially fails and at least partially releases the channel (16).