This standard refers to the Japanese standard JIS 6402-85. This standard specifies the geometric accuracy, tolerances and inspection methods of closed four-point presses. This standard applies to general-purpose closed four-point presses.
JB/T 5200-1991 history
2012JB/T 5200-2012 Straight-sided four-point mechanical power press.Testing of the accuracy
1991JB/T 5200-1991 Straight-side four point press Precision