Nuts, hexagonal, slotted (castellated), reduced height, reduced across flats, with MJ threads, classifications. 450 MPa (at ambient temperature)/425$0DC, 600 MPa (at ambient temperature)/235$0DC, 600 MPa (at ambient temperature)/315$0DC, 600 MPa (at ambient temperature)/650$0DC, 900 MPa (at ambient temperature)/235$0DC, 900 MPa (at ambient temperature)/730$0DC and 1100 MPa (at ambient temperature)/600$0DC. Dimensions