Stainless Steel Adapter: [ 1/2" OD, 3/8"-16 MALE x CROSS HOLE ]
Price : $10.50
The 1/2" diameter adapters are typically used DIY pole spear builds who have bought Aluminum tube for their home build.
3/8"-16 Cut type Thread Tap requires a 5/16" hole. If your tubing has a .092" wall you will not to drill the aluminum tube. [ good axial alignment in taping is critical for straight connections] A form tap uses a .3480" hole (drill size S).
Questions: ( firstname.lastname@example.org ) [ 707-477-0869 ] PST , give me a call - drop a note.