Answer: nervesofsteel

AnswerCrossword Clue
NERVESOFSTEELSpare parts for a robot?
NERVESOFSTEELSteady courage
NERVESOFSTEELGood trait for a tightrope walker
NERVESOFSTEELHero's sine qua non
NERVESOFSTEELSome parts for a fearless robot?