N pigtail with clamp type N connector will have better performance than crimp type N connector because coaxial cable’s impedance won’t be changed in termination process.
Wellshow’s PN is C27DA38L40005 for this N plug right angle crimp type for LMR400, RG8U coaxial cable.
Please link N connector plug right angle clamp for RG58/LMR195/RG141 to get details and drawing of C27DA38L40005 for LMR400, CFD400, RG8/U coaxial cable.