ISO 8434-1 Screw threads Standard including Cone ends and nuts, Stud ends (connection ends).
Cone ends and nuts
The screw threads on the cone ends and the nuts of the connectors shall be ISO metric screw threads in accordance with ISO 724, tolerance grade 6g and 6H respectively, in accordance with ISO 965-1.
Threads shall be chamfered at the face of the connector to an included angle of 45°. The diameter of the chamfer shall be equal to the minor diameter of the thread, with a tolerance of −0 4 to 0 mm.
Stud ends (connection ends)
The thread for stud ends (connection ends) of connectors shall be chosen from ISO 228-1, Class A, or ISO 724, tolerance grade 6g, in accordance with ISO 965-1. The dimensions of the stud ends shall be in accordance with Tables 11 to 13, 18 and 19 and the relevant stud end standards.