Standard Rate Turns in the "big iron"

It just occured to me that the big iron in every flght sim I have played doesn't have a standard rate turn indicator.I would assume this means real airliners don't have them, or they are not a primary intsrument for some reason.I then thought that maybe as most turns and courses are flown on autopilot and it knows how to fly a SRT, then its OK.However having watched several (lots) of different sim autpilots negoiate a 180 turn in holding, I'm not sure this is so. Bank angle limits etc. will effect its turn rate.Any pointers on how exactly to maintain a standard rate turn in the big iron?