Inspector
Nyuck, Nyuck, Nyuck!
We can get 14tpi blades here so I don't see why you can't get them there. This was the first place I looked on line. I know I can get them locally at the machiningl tooling suppliers.
https://www.amazon.ca/Tools-Hacksaw-12-inch-10-Pack-20143V214HE/dp/B004J11DHU
Pete
Adding that there are metal cutting blades made for reciprocating/sawsall saws but I have never tried mine on anything bigger than 3" pipe. If you have one or can borrow one it might be worth a shot.
https://www.amazon.ca/Tools-Hacksaw-12-inch-10-Pack-20143V214HE/dp/B004J11DHU
Pete
Adding that there are metal cutting blades made for reciprocating/sawsall saws but I have never tried mine on anything bigger than 3" pipe. If you have one or can borrow one it might be worth a shot.