Thread Pitch of Fittings from Carburetor to Distributor Vacuum Advance Canister

[hi_volt]

I've looked through a number of the threads here but so far haven't found a definitive answer.  I'm trying to determine the thread pitch of the female receptacles on the carburetor and the vacuum advance canister on the distributor so that I can add fittings to accommodate a flexible vacuum hose.  The distributor is an Autolite IAT-4101 and the carburetor is a Carter ball and ball DTC1.  Any help would be appreciated. 🙂

[Plymouthy Adams]

I am thinking these older tubing gland nuts was 1/16 pipe thread.....you should be able to snag these locally from a hardware store, check in their tubing fittings usually in a plastic display case.  

[Harley PHD]

My 1950 coronet uses the same fittings as the brake lines.  Its solid metal line from distributor to carburetor.  

[Los_Control]

Think it depends on which fitting we are talking about.

 

The vacuum advance technically has 3 fittings and 3 different threads. The middle adapter I believe is NPT threads like @Plymouthy Adams suggest, then standard lines will thread to that .... the carburetor has the same adapter and believe a good hardware store would have them.

[hi_volt]

Thanks everyone.  It turns out that the male fittings I needed are 3/16" tube nuts for inverted flare tubing, with a thread pitch of 3/8-24.  I bought some pre-made copper nickel brake lines with these fittings and they work perfectly.

 

Edited January 19 by hi_volt