S1 has M12X1mm threading

Notice the 3 different standards: pitch 1, 1.5, 1.75 and choose the correct option for your bike.

Upgrading a standard axle to 12mm with a derailleur hanger that supports a lock nut? This is the product for you...

Also meant to lock the axle after it's broken or replaced and the axle threading does not fit the old nut 3rd case is when the original nut threading is torn The nut can be locked from 2 angles

Compatible with rear axle of- DT Swiss/Sram/Shimano 1.0P