This standard specifies the conditions and requirements for the strength test of the towing device of the tractor and the matching 40mm and 50mm drawbar rings.
GB/T 15087-2009 Referenced Document
GB/T 3730.2 Road vehicle--Masses--Vocabulary and codes
GB/T 15087-2009 history
2009GB/T 15087-2009 Road vehicles.Drawbar couplings and eyes for hinged drawbars.Strength tests
1994GB/T 15087-1994 Motor vehicles-Drawbar couplings and eyes for hinged drawbars-Strength test