An insulating body for a plug connector is provided, having at least one seat for a contact, the seat being open in the peripheral direction and surrounding a receiving space for the contact over an angular range which is greater than 180 degrees and smaller than 300 degrees, and wherein at least one peripheral edge of the seat has a guide web provided thereon which is elastic in the radial direction of the seat and which has a wall thickness that is greater at the free end than in the region of the connection to the seat.