I have a transmission case - cast aluminum - that has a .375" dia. blind hole, 1" deep. I want to make it a threaded hole.
I can use a threaded insert (NOT a Stanley, lol) and 'Helicoil' it to 3/8-16. But, I'd prefer the hole end up 5/16-18 anyway, and I'm wondering if it's better to thread the hole to accept an 11mm threaded steel rod, Loctite in a rod, then drill and tap the filled in hole for 5/16-18?
This would leave a minimum wall thickness of about .030 per side - is that enough?
I can use a threaded insert (NOT a Stanley, lol) and 'Helicoil' it to 3/8-16. But, I'd prefer the hole end up 5/16-18 anyway, and I'm wondering if it's better to thread the hole to accept an 11mm threaded steel rod, Loctite in a rod, then drill and tap the filled in hole for 5/16-18?
This would leave a minimum wall thickness of about .030 per side - is that enough?