I have a -12AN bulk head fitting. What drill bit size do I need to use to tap the hold for that thing? I've Googled it and got several answers. I gave up and decided to ask the experts. Thanks in advance.
Mcmaster has one for $60 - I'm sure you can find one cheaper.
BTW, if you 45° bevel the hole, turn the thread off the seal area, use the appropriate AN o-ring, it will seal. Think o-ring fuel fittings. Your threads will be wetted so consider corrosion - think dissimilar metals, water, alky, or modern pump gas
But you gotta ask yourself - How bad do you want to do this
Take a dial caliper and use the narrow tips of the caliper and measure the bottom of the thread then take a few thou off that number or go to the next common drill size down. The reasonably thin aluminum will tap pretty easily.
Personally, if it were me, I'd drill and tap a slug of aluminum and weld it to the cover, it'll be a lot stronger than just trying to thread the thin cover.
Do a google search for "welding shop" in Georgetown, IN. something close will pop up. I wouldn't trust JB Weld to hold the weight of the hose or seal for the long term.
There are AN tank fittings that are best suited for this application but any fitting can be used, you just need to remove (sanded or wire wheel) the colored or clear anodizing before welding. I drilled the hole the same size as the I.D. of the fitting so the fitting sits on the surface not into it, it welds better this way.
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