This standard specifies the type, size and arrangement of mounting bolt holes on the corner blades of bulldozers. This standard applies to fixed, rotary, semi-U-shaped and U-shaped bulldozer blades.
JB/T 5961-1991 history
2007JB/T 5961-2007 Iractor-dozers.Hole dimensions and location of end bits
1991JB/T 5961-1991 Dimensions and Arrangement of Bulldozer Angle Blade Holes