Main shear key

The utility model discloses a main anti-shear key, which comprises an anti-shear key I-steel main body and a slide rail groove, an auxiliary component is arranged on the left side of the anti-shear key I-steel main body, a scale display meter is arranged above the left side of a limiting plate, and the slide rail groove is arranged below the left side of the limiting plate. According to the main shear key, through an auxiliary assembly, a sliding rail groove, a limiting circular block and an auxiliary limiting rod, an operator can accurately cut an I-shaped steel main body of the shear key through a scale display meter and the auxiliary limiting rod according to a result designed and checked by a technician, and through a limiting groove body, a rotating auxiliary block, a limiting long plate, a threaded sleeve and a handle, the main shear key is convenient to use. And meanwhile, the protection strip sponge, the limiting long rod and the handle are beneficial to protecting the sharp corner of the shear key I-