There are 2 drawings for part spline nuts - esna available in AirCorps Library

Manufacturer's Drawing

Generic Parts - Aviation,   AN Standards 1-10000,   Page: 1,   Revision: n/a  

NUT - SPLINE

Associated Aircraft:   GENERAL   STAND  

Manufacturer's Drawing

Generic Parts - Aviation,   AN Standards 1-10000,   Page: 2,   Revision: n/a  

NUT - SPLINE

Associated Aircraft:   GENERAL   STAND