Thread cutting advise / tools

L

liteace

Registered
Registered
Hi ALL, Im new here, I hope I have posted in the correct place, if not please move.
To start with, I hope your all doing as well as you possibly can in the current situation and I wish you all the best



I have a valve, one side has a thread of 1/4" sae, this is the side I need to work with, what I need to do is drill and tap a plastic block, screw this in and try make a tight seal, as I have no access to the other side / inside of the block, any tips on the best way to do this to get a good tapered seat for this to seal on. also what size/type drill bit and tap would need

I also have a pressure gauge that I might need to use with this, the gauge has 1/4 bspp thread with a small aluminum sealing washer, again need advise on drilling and tapping, as this has flat seal do flat drill bits exist for doing this kind of work




Thanks
 
Ahh - an adapter. SAE is widely used for solenoid valves. NPT is tapered, like BSP.

BSPP (the parallel thread) will seal if offered into the tapered BSP.
I always used some PTFE tape. When both the male and female were BSPP, I used a Dowty seal, or sometimes I just cut some chamfer to accommodate a thin section O-ring. Getting a pressure gauge to seal was no problem.

For the SAE end, there is lots of information on threads and sealing. I am less sure about making it in plastic, but I am sure someone at HM knows how.

https://www.hydraulicsdirect.com/Fitting-Thread-Chart-s/1934.htm
https://www.essentracomponents.com/en-us/news/product-resources/identifying-threads-and-connectors
https://www.ryco.com.au/technical/thread-connector-identification/sae-threads/
https://trimantec.com/blogs/t/thread-identification-guide#SAE-Chart
 
After some google'ing it looks like the 1/4" sae was also used on the early vehicle R12 ac systems for the charge ports, I'll have to look into that as well
 
You must log in or register to reply here.
Back
Top