A concave for an agricultural combine includes a frame having curved members, and angle members each having opposite ends, a corner segment, a straight threshing segment including a threshing edge, and a straight separating segment having a separating grate. Each of the opposite ends of each of the angle members is non-destructively held in a respective one of a plurality of corresponding angle slots of the curved members. The angle members extend between the curved members, are spaced from one another and extend axially between the curved members forming openings therebetween for grain to pass through, the threshing edge of each one of the angle members is adjacent to top edges of the respective curved members, and the separating grate of each one of the angle members extends across an adjacent one of the openings for separating grain from threshed crop material.
