https://www.engineersedge.com/hardwa...ead-sizes1.htm
You probably are still a little big on the OD
On external threads, refer to the "Major Diameter" section and the "max" and "min" column.
Max is the largest OD (outside diameter) you should thread at and the min column is the minimum outside diameter for threading. Any smaller than minimum will give you sloppy fit.
To convert from millimeter to inch:
Millimeters ÷ 25.4 will give you the inch decimal equivalent.
Inches x 25.4 gives you the millimeter equivalent
Sent from my Z958 using Tapatalk