For the part number 535B1202JC4115 Rotary Potentiometer, which is a special request part number from Vishay Spectrol. The last special-request suffix 4115 designates Metric Shaft Dimension.
If there is no metric shaft requested, you can consider the standard part number, 535B1202JC for your design.
For the detail specification, please refer to the datasheet.
Please review the datasheets to ensure the alternative will work for your application.