yorkshire_spam Posted December 3, 2021 Share Posted December 3, 2021 I'm fettling the starter for our 1850 and most of the threads/nuts/bolts seem to be metric, BUT the long studs that go all the way through the case, threaded into the front alloy part and retained at the back of the rear alloy part with 2 nuts is evading me. The male thread seems to have a major diameter or 6.7mm / 0.26" and is pretty close to 1mm pitch / 25tpi To start with I thought it was M7... nope. It pretty much matches the "pattern" of BA threads but is larger than BA0 I can't see a whitworth thread that would match, It's not a million miles off 9/32 BSC.... Does anyone actually know what thread it is? Before I started trying to match it my money was on either metric or BA 😞 For "clarity" my starter has threaded studs in place of the parts marked RTC839 in this diagram: Quote Link to comment Share on other sites More sharing options...
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