This standard specifies the structural elements and locking torque of the locking part of nylon inserts. This standard applies to general-purpose locking bolts and screws embedded with cylindrical nylon inserts. The types and dimensions of other parts of such bolts and screws are in accordance with the provisions of the corresponding national standards.
JB/T 5399-1991 history
1991JB/T 5399-1991 Nylon insert locking nut and screw locking part Structural elements and locking torque