This nut is used to tighten the input shaft spindle and the leaver arm bearing.
2 nuts are needed for a rebuild.
Nut size OD 1.55 ID 0.933
Smallest nut in cam box.
Custom socket to remove this nut is listed below.
This part is compatible with Haas machines 93-1422, 93-1421, 93-1414
Disclaimer: this aftermarket part was not manufactured by Haas.