Could someone tell Me what the Thread Base is on the Ensign BEV Carb Fuel adjusting Screw [3B64e ] it is 32 TPI X 1/4 "and none of My books tell Me what it is [Like UNF etc] We are Making New 3B46e Fuel Controls. May have to make the Thread a little Coarser ,That would mean Making New Screws as well, Which I don't think should Be a Problem. Any Help appreciated . LJ

Hi Lance,
threads are a can of worms for Carbies and the like--sometimes the maker used their own thread system--sheesh-- just to bamboozle us all.

It seems from Googling that 1/4" x 32TPI can be either UNF 60 Degrees thread form angle or also can be Whitworth 55 Degrees thread form angle.

en.wikipedia.org/wiki/Unified_Thread_Standard

www.hobbymechanics.com.au/wf-taps-and-dies-x-32-tpi/

Being a American Company one would be fairly safe to assume it will be a UN thread form.

en.wikipedia.org/wiki/Ensign_Manufacturing_Company

Good luck.
Cheers,
Eddie B.

Thank you Eddie, They sure are a Can of Worms, Now to find a tap and Die !! LJ

One can buy UNEF threaded dies and taps on eBay.

be careful it may be uns united national special. a full thread chart is hard to find. some extra fine threads are what is known as British Aircraft though mostly British stuff use those threads.

any good machinists supply should be able to get what ever size you need.

Thanks everyone, Great Help, a local Member Emailed with These Details , M.E Thread [Model Engineering] 32TPI, Believe it, they go to 44 and 55 TPI. So I rang the Company, LPR Toolmakers in Vic. and a set is on the way, again thanks to all. LJ