This standard specifies the shape, size and technical requirements for the length of the pin hole at the tail root of the No. 13 hook and the inner stop of the fixed mounting lug (hereinafter referred to as the pin hole length plate). This standard is applicable to the inspection template for the length of the tip hole of the No. 13 hook tail frame on the new side and the dimensions of the inner stop of the fixed mounting lug.
1996TB/T 2604.6-1996 Inspection sample for length of pin hole of No. 13 coupler frame and inner rail of fixed lug
TB/T 2604.6-1996 Inspection sample for length of pin hole of No. 13 coupler frame and inner rail of fixed lug was changed to TB/T 2604-2007 Gauge for No. 13A type coupler yoke.