This International Standard gives a series of preferred diameters of the finished wire terminations of capacitors and resistors for use in electronic equipment.
IEC 60301:2012 history
2012IEC 60301:2012 Preferred diameters of wire terminations of capacitors and resistors
1970IEC 60301:1971/AMD1:1972 Amendment 1 - Preferred diameters of wire terminations of capacitors and resistors
1971IEC 60301:1971 Preferred diameters of wire terminations of capacitors and resistors
1970IEC 60301:1969 Preferred diameters of wire terminations of capacitors and resistors