master cylinder

johnnybiz Posted 2016-03-29 2:13 PM (#508234) Subject: master cylinder Veteran Posts: 174 What size bolt is used for the cover of the master cylinder for a 1958 chrysler Powerflite Posted 2016-03-29 8:04 PM (#508259 - in reply to #508234) Subject: RE: master cylinder Expert 5K+ Posts: 9701 Location: So. Cal Do you mean the thread or the head of the bolt? The bolt head is a 7/16" and I believe the thread is 1/4-28, but not certain. The head of the bolt is sunken into the cap a little so a small 7/16 socket is the best tool to use to loosen it. Ev's62Chrysler Posted 2016-03-29 9:11 PM (#508268 - in reply to #508234) Subject: Re: master cylinder Veteran Posts: 210 Location: Suwanee, GA The new master cylinder I just purchased has 1/4-20 threads. Not sure of the length. 57chizler Posted 2016-03-30 4:54 PM (#508333 - in reply to #508268) Subject: Re: master cylinder Expert Posts: 3780 Location: NorCal The thread is 1/4"-20 but the length varies with the design of the cap. (some are more "domed" than others)