The utility model belongs to the field of engineering components and discloses a bolt which comprises a stud and a bolt head, wherein grooves are formed in the bolt head; the grooves include a rectangular groove and two isosceles trapezoid grooves; the two ends of the rectangular groove are connected with the upper bottom surfaces of the two isosceles trapezoid grooves respectively and communicated with the two isosceles trapezoid grooves respectively; a spanner used together with the bolt comprises a spanner body and spanner clamping heads, wherein the spanner body is matched with the grooves; the two ends of the spanner body are connected with the spanner clamping heads; the spanner clamping heads are integrated with the spanner body. According to the utility model, the grooves with wider two ends are formed in the bolt head, and the spanner is matched with the grooves, so that the phenomenon of slipping or releasing is avoided, and the working efficiency is high; in addition, the spanner is further provided with a sleeve and a metal rod, and two operators can apply force together when the resistance is larger, so that the bolt can be screwed more easily, and the labor intensity is low.